Storage system with procedure for monitoring low level status codes, deriving high level status codes based thereon and taking appropriate remedial actions

TECHNICAL FIELD
The present invention relates to devices for storing computer data and relates particularly to diagnostics and status monitoring.
BACKGROUND ART
It is known to provide status monitoring in a disc drive and U.S. Pat. No. 5,450,609 describes one such system in which an array of disc drives includes a facility for status monitoring and for warning the user of a problem. The warning facility described is not very different in scope from the known facility on existing tape drives of a warning light indicating failure of a backup operation.
DISCLOSURE OF INVENTION
The present invention aims to provide a status monitoring and diagnostic facility for a storage device which takes account of the fact that the storage medium is removable and which diagnoses a wider range of error conditions than simply flagging imminent failure.
According to the present invention we provide a system for storing computer data comprising:
a storage device having means for reading data from and writing data to removable media;
and a controller,
wherein the storage device comprises:
means to perform error diagnosis and to translate low-level error indicators into high level error conditions and wherein the high level error conditions are categorised according to severity;
means to communicate occurrence of these high level error conditions to the controller to trigger the provision of error messages to the user.
Embodiments of the present invention provide a facility to inform the user of errors occurring during a backup operation and to group errors into categories according to severity. This enables the provision of messages to the user which are primarily for information as well as messages to indicate more serious error conditions. This feature also enables the user to prioritise error recovery steps according the severity of the error conditions if there is more than one existing at the same time.
The term `low-level error indicator` is intended to cover both error codes and other relevant triggers generated in the storage device. Low-level error codes cover items such as unrecoverable read and/or write errors but there are also other relevant triggers for high level error conditions such as the rate at which data is being written, data relevant to the media being used etc. Low-level error indicators are normally generated by the firmware in the storage device.
In the embodiment to be described, the storage device is a tape drive, but the invention applies also to other storage devices with removable media eg. optical disc drives.
The controller may be backup controller software running on a host computer. Alternatively the system may be part of network in which the controller is backup software running on a backup server on the network. However, the invention is not limited to these alternatives and the controller may be implemented in software and/or hardware and may be in a general purpose computer or a dedicated device, whether standalone or connected to a network.
In the embodiment to be described, the high level error conditions are categorised into three classes according to severity. The classes are: Information, Warning and Critical.
If there is a plurality of error conditions occurring at the same time, error messages may be ordered according to the relative severity of the pertaining error conditions. This feature may help the user in prioritising the necessary error recovery steps.
The low-level error indicators may be grouped into functional types and the high level error conditions may be communicated according to what functional type of low-level error has occurred. This feature may facilitate specifying the relationship between low-level error indicators and the high level error conditions, which task would normally be carried out by the storage device manufacturer.
Preferably the system comprises means to automatically initiate a predetermined sequence of error recovery steps according to the type of high level error conditions identified. In this way there may be provision for automatically triggering specific error recovery steps without manual intervention of the user.
In the embodiment to be described, the error status information is stored in the storage device in a standardised format. In this way, the invention provides a technique whereby the way in which errors are detected and categorised for a particular storage device is device-specific and can be decided by the device manufacturer but within the context of a standardised scheme which enables all devices complying with the standardised format to provide the user with consistent error indications.
There are different ways in which the controller may receive error information from the storage device. In one embodiment, the system is configured so that the occurrence of high level error conditions is communicated to the controller at predetermined points in a storage operation. In another embodiment, the system is configured so that the occurrence of high level error conditions is communicated to the controller whenever a new error is indicated by the storage device.
The system may comprise a plurality of storage devices, such as in an autoloader or a coordinated array of storage devices.
According to another aspect of the present invention we provide a system for storing computer data comprising:
a storage device having means for reading data from and writing data to removable media;
and a controller,
wherein the storage device comprises:
means to perform error diagnosis and to translate low-level error indicators into high level error conditions;
wherein selected low-level error indicators cause communication of a combination of high level error conditions;
means to communicate occurrence of these high level error conditions to the controller to trigger the provision of error messages to the user.
In known systems for storing computer data which include a storage device communicating with one or more host devices using a SCSI link, or bus, the occurrence of a low-level error indicator triggers a single high level error message. According to the above aspect of the present invention, a combination of high level error conditions may result from selected low-level error indicators thus providing a more flexible system and allowing a more extensive set of error messages to be provided to a user.

BRIEF DESCRIPTION OF DRAWINGS
A particular embodiment of the present invention will now be described, by way of example only, with reference to:
FIG. 1, which shows a tape drive connected to a host computer; and
FIG. 2, which shows by way of a functional block diagram the arrangement of FIG. 1.

The invention will also be described, by way of example, with reference to tables reproduced at the end of this description in which:
Table 1 shows the error conditions relating to particular flags;
Table 2 shows the format of the Log Sense page;
Table 3 shows the format of the Mode Sense page.
BEST MODE FOR CARRYING OUT THE INVENTION, & INDUSTRIAL APPLICABILITY
Referring to FIG. 1, a tape drive 10 is directly connected to a host computer 12. The tape drive 10 receives data to be backed up from the host computer 12 and sends saved data back to the host when requested. A standard SCSI (`Small Computer System Interface`) interface is used to interconnect the tape drive 10 with the host computer 12.
FIG. 2 is a functional block diagram of the system represented in FIG. 1. In FIG. 2, the tape drive 10 is arranged to store and retrieve data in accordance with the digital data storage (DDS) standard format. The tape drive 10 comprises a host interface unit 21 for interfacing the drive 10 with a host computer 12 via a standard SCSI bus 39. A data formatter 22 in the tape drive 10 processes user data records and separator marks into and out of indexed groups, compresses/decompresses data in a known fashion and effects low-level signal processing, as specified in the DDS format. The low-level processing converts streams of bytes from the groups into track signals ready for recording data to tape and reconverts track signals from tape back into byte streams for reconstructing the groups. The tape drive 10 further comprises a deck 29 of known type comprising electronic circuitry for controlling recording heads and tape operations for writing data to and reading data from a tape medium 295. The tape drive 10 also comprises a tape drive controller 23 for controlling the operation of the other elements of the drive in response to commands received from the host 12 via the host interface unit 21.
The drive 10, controlled by the tape drive controller 23, is arranged to respond to SCSI commands from backup software 36 running the host computer 12 to load/unload a tape, to store a data record or separator mark, to search for selected separator marks or records, and to read back the next record and to compress/decompress data records. These functions are standard tape drive functions and, as such, will not be considered in further detail in this description. For further, more detailed information on DDS tape drives and the respective data format, the reader is referred to European Patent Application EP459041A1.
In accordance with the present embodiment, the tape drive controller 23 incorporates further functionality, which a storage device has hitherto not provided, to support status monitoring and tape drive diagnostics capabilities. This functionality is provided by appropriate firmware processes 24 embedded in the tape drive controller 23. Of the processes: a first process 242 monitors the status of pre-determined functions in the tape drive 10 by receiving low level system status codes returned by the other elements of the drive during the operation of the tape drive and, in response, sets flags to indicate possible problems; a second process 244 interprets the flags in a pre-determined manner and generates one or more predetermined high level status or error codes; and a third process 246 prioritizes the high level codes, where more than one code exists, in accordance with a pre-defined criteria and stores the results in an area of random access memory (RAM) 25 accessible by the tape drive controller 23. Once stored, the high level codes may be forwarded to the host computer 12, for example by "polling", as described below in more detail. The low level codes, the flags, the high level codes and the priority criteria are also described in detail below.
As also illustrated in FIG. 2, the host computer 12 comprises a standard computing platform running under the control of an operating system 37 such as Windows NT 4.0. Backup controller software 36, stored in main memory 31 and running on a central processing unit 35, is a software process written, for example, in the C.sup.++ programming language. The backup software 36 is arranged to control the host computer 12 to operate in accordance with the present embodiment. The operating system 37 of the host computer 12 includes: a network driver 32 for transmitting and receiving data, for example in TCP/IP format, to and from a network (not shown); a display driver 33, such as a video graphics array (VGA) driver, to transmit display signals to a display screen 38; and a SCSI driver 34, to transfer commands and data between the host computer 12 and the tape drive 10. The drivers provided support respective standard hardware interfaces.
The backup controller software 36 is arranged to control the host computer 12 to retrieve high level status or error codes which have been stored in the memory 25 from the tape drive 10 by polling the tape drive 10 regularly. Other methods of moving the data from the tape drive 10 to the host computer 12 are described below. Further, the backup controller software 36 is arranged to process any received high level status or error codes and forward to a user appropriate, pre-defined error or action messages. Such messages may be forwarded for display to the user on the display screen 38, and/or across a network to a remote network console (not shown) as necessary.
In accordance with the present embodiment, there are 64 flags defined to cover a wide range of error conditions and these are as shown in Table 1. The column headings in Table 1 are as follows:
No.--this is simply the flag number;
Flag--this is the name of the flag and indicates the error to which it relates;
Type--this indicates the seriousness of the error:
"I"=Information: a suggestion to the user;
"W"=Warning: the user is advised to take action. Performance or data may be at risk;
"C"=Critical!: action should be taken immediately;
Required Host Message--this is the text of the message which should be relayed to the user eg. by display on the screen 38 of the host computer 12;
Cause--this indicates the cause of the error.
The flags are grouped into the following categories:
Flags 1 to 19: For tape drive write/read management
Flags 20 to 29: For cleaning management
Flags 30 to 39: For tape drive hardware errors
Flags 40 to 49: For tape autoloader errors
Flags 50 to 64: Currently unassigned for future use
The specific conditions for any one flag to be set and cleared are drive-specific and are defined by the drive manufacturer. If a drive cannot support the recognition of all the flag conditions, then unsupported flags may remain unset.
Low-level error indicators may be grouped into functional types with a set of possible low-level error indicator codes being assigned to each group. The relevant functional types include:
Unrecoverable write error codes;
Unrecoverable read error codes;
Tape management error codes;
Hardware error codes;
Recoverable write error codes;
Recoverable read error codes.
There are also other groups in addition to the above.
If such grouping is done, then flags may be set according to which type of low-level error indicator has occurred. For example, all recoverable write error codes would cause a particular flag to be set, in fact Flag 1 in Table 1 in this embodiment. This feature relieve the tape drive manufacturer of the need to define a mapping from every single low-level error indicator to a particular flag.
Furthermore, the system may be configured so that a combination of high level error conditions result from selected low-level error indicators. Thus two or more flags may be set in order to provide a plurality of relevant error messages to the user.
A well-known feature of the standard SCSI interface is the use of `log sense` pages to record peripheral status information and `mode sense` pages to record functional and configuration settings.
The error information contained in Table 1 is stored by the tape drive 10 in a `Log Sense` page in memory 25. The format of the Log Sense page is shown in Table 2. Each line in the Log Sense page represents one byte of data and the entries are numbered down the lefthand side of Table 2. A description of the entries is as follows:
Entry 0--the name of the page (2e in this example);
Entry 1--reserved for future use;
Entry 2--the length of the particular page (2 bytes long);
Entry 3--the remainder of the page length;
Entry 4--the SCSI standard uses parameters and this is the name of the current parameter (2 bytes long). In this embodiment, each parameter corresponds to one of the flags in Table 1;
Entry 5--the remainder of the parameter name;
Entry 6--the parameter control byte. The fields are explained below. The terms `sense key` and `sense code` are commonly used in relation to the SCSI standard to refer to codes for the type of error and details of the error, respectively:
DU=Disable Update: a value of zero means that the tape drive will not update the log parameter value (Entry 8 below). A value of one means that the tape drive will not update the log parameter value except in response to a Log Select command that specifies a new value for the log parameter. The DU bit is undefined and ignored if the PC bit (part of the page code) in the Log Sense command is set to 0.times.00 (as in this embodiment);
DS=Disable Save: a value of zero means that the tape drive supports saving for that log parameter. A value of one means means that saveable parameters are not supported;
TSD=Tape drive Save Disable: a value of zero means that the tape drive provides a tape drive-defined method for saving log parameters. A value of one means that the tape drive does not provide a tape drive-defined method of saving log parameters;
ETC=Enable threshold comparison: a value of one means that comparison to the threshold value is performed. A value of zero means that a comparison is not performed;
TMC=Threshold Met Criteria: defines the basis for the comparison of the parameter value. Only valid if ETC=1. If the ETC=1 and the comparison is true, a check condition will be generated. The Sense key is then set to UNIT ATTENTION and the additional sense code is set to THRESHOLD CONDITION MET;
LP=List Parameter: indicates the format of the log parameter. A value of zero means that the parameter is a data counter. A value of one means that the parameter is a list parameter, and then the ETC and TMC field must be set to zero;
Entry 7--the length of the current parameter;
Entry 8--the actual parameter. In this case it is the first flag, namely the Read Flag. In this embodiment only one bit is used for each flag;
Entry 9 and so on--corresponding entries for the subsequent parameters (flags).
There are two methods by which the host computer 12 can access error information in the tape drive 10. The first method is "polling" where the Log Sense page is read from the tape drive at the following times as a minimum:
1. Immediately after a SCSI Check Condition/Request Sense cycle. This is a standard cycle in which the drive makes an error status report and if there is an error this is indicated as a `Check Condition`. The host then sends a `Request Sense` command to get details of the error.
2. At the end of each tape when the backup/restore job spans multiple tapes. If the tape is to be ejected then the Log Sense page must be read before ejection.
3. At the end of a backup/restore job.
It is also recommended to poll the Log Sense page every 60 seconds while the tape drive 10 is idle.
The second access method is to use the SCSI `Mode Select` command to enable the "Check Condition" mode, so that the tape drive 10 will report a Check Condition on the next SCSI command after one or more flags are set. If this SCSI command should return a Check Condition due to an actual error, then this will override the Check Condition `forced` by the Mode Select command. The Log Sense page will therefore be read from the tape drive 10 after every Check Condition/Request Sense cycle (both forced check conditions and error check conditions). The Request Sense extended sense code (this is the code reported by the tape drive 10) for a check condition is 5D00, and the command that triggered this Check Condition will have been executed, thus the backup controller software 36 will not repeat the command that triggered a Check Condition.
The recommended method is "check condition" rather than "polling" since this guarantees that the backup controller software 36 will be made aware of any flag being set. With "polling" there are theoretical corner cases where flag information could be missed, though the higher the polling frequency the less chance there is of this happening.
The method of access to the tape drive 10 can be configured via the SCSI bus, based on a new Mode Sense page. The interface can be configured via the Mode Select command using the same page format to write the configuration as to read it (Mode Sense command). The format of this new Mode Sense page is as shown in Table 3.
Again each entry in the Mode Sense page is one byte long. The entries are as follows:
Entry 0--the name of the page (1C in this example);
Entry 1--the length of the particular page;
The following fields are in the remainder of the Mode Sense page:
DExcpt: When this bit is set to zero the reporting method indicated by the MRIE field is used. When this bit is set to one this indicates that the tape drive 10 will ignore the MRIE field (so that the backup controller software 36 must poll the Log Sense page). Thus to enable "check condition" mode, this bit must be set to zero.
In this embodiment, the default setting is 1, and this is configurable via Mode Select
Test: When this bit is set to zero, this indicates that the tape drive 10 will not generate any false flags. When this bit is set to one, the tape drive 10 will set a false flag based on the MRIE and Interval Timer flags. Thus the next SCSI command after the Mode Select command will return Check Condition, with sense key set to UNIT ATTENTION and extended sense code set to 5DFF (a test code). If both the Test and DExcpt bits are set to one, then the Mode Select command will return Check Condition, with sense key set to Illegal Request and extended sense code set to INVALID FIELD in the Parameter List.
In this embodiment, the default setting is 0, configurable via Mode Select
Perf: When this bit is set to zero, this indicates that flag setting operations that can cause delays are acceptable. When this bit is set to one, the tape drive 10 will not cause delays while setting flags (this may cause the tape drive 10 to disable some or all of the flag setting operations).
In this embodiment, the default setting is 0, not changeable via Mode Select
LogErr: When this bit is set to zero, this indicates that the logging of flags set within a tape drive 10 is vendor specific. When this bit is set to one, the tape drive 10 will log flags set.
In this embodiment, the default setting is 0, not changeable via Mode Select
MRIE: This field indicates the method used by the tape drive 10 to report flags set. The priority of reporting flags set is tape drive 10 specific. If the access method being used is the one described above using the Mode Select command to enable the "Check Condition" mode, so that the tape drive 10 will report a Check Condition on the next SCSI command after one or more flags are set then, in the event that the SCSI command should return a Check Condition due to an actual error, then this will override the forced Check Condition. The values defined for this field are:
0.times.1: No reporting of flags set
0.times.2: Generate Unit Attention: tape drive 10 returns Check Condition on the next SCSI command after a flag is set, with the sense key set to UNIT ATTENTION and the extended sense code set to 5D00. The command that triggered the forced Check Condition will not have been executed, and thus needs to be repeated;
0.times.3: Conditionally generate Recovered Error: depending on the value of tape drive 10 error recovery settings, the tape drive 10 returns Check Condition on the next SCSI command after setting of a flag was detected, with the sense key set to RECOVERED ERROR and the extended sense code set to 5D00. The command that has triggered the forced Check Condition will have been executed correctly, and thus does not need to be repeated;
0.times.4: Unconditionally generate Recovered Error: regardless of the value of the tape drive 10 error recovery settings, the tape drive 10 returns Check Condition on the next SCSI command after setting of a flag was detected, with the sense key set to RECOVERED ERROR and the extended sense code set to 5D00. The command that has triggered the forced Check Condition will have been executed correctly, and thus does not need to be repeated;
0.times.5: Generate No Sense: tape drive 10 returns Check Condition on the next SCSI command after setting of a flag was detected, with the sense key set to NO SENSE and the extended sense code set to 5D00. The command that has triggered the check condition will have been executed correctly, and thus does not need to be repeated;
0.times.6: Only report on request: tape drive 10 will preserve the flag(s) set. The backup controller software 36 then polls the tape drive 10 using the Log Sense command.
In this embodiment, the default setting is 3, not changeable via Mode Select.
Interval Timer: When this field is set to zero, this indicates that the tape drive 10 will only set a flag once. When this field is set to non-zero, the value indicates the period in 100 millisecond increments for resetting a flag. The tape drive 10 will not set flags more frequently than the specified timer interval and will set flags as soon as possible after the timer interval has elapsed. A value of 0.times.FFFFFFFF in the field indicates that the timer interval is tape drive 10 specific.
In this embodiment, the default setting is 0, not changeable via Mode Select.
Report Count: When this field is set to zero, this indicates that there is no limit to the number of times the tape drive 10 will report a flag being set (assuming that Interval Timer is set to non-zero). When this field is set to non-zero, this indicates the number of times to report a flag being set.
In this embodiment, the default setting is 0, not changeable via Mode Select.
Every time the Log Sense page is read from the tape drive 10, the backup controller software 36 reads all 64 flags to discover which are set (there may be more than one). There may also be data associated with a set flag in the remainder of the flag byte, which should also be read. The flags will automatically be cleared by the tape drive 10 without action from the software, and thus any set flags read by the backup controller software 36 indicate a new event. The software therefore will not latch any flag states but will always action any set flag detected.
A particular backup controller may be connected to more than one tape drive 10. In addition, for each tape drive 10, there will be a plurality of tape cassettes used for backing up data. Each tape cassette is given a `software label` to identify it.
For every flag that is set, the backup controller software 36 will log the error message specified in Table 1 along with details to identify which tape drive 10 the error refers to, and the software label of the media for media related actions (flags 4 and 7). The severity of the error is identified based on the flag Type field in Table 1, and when multiple flags are set simultaneously they are listed in ascending order of severity ie. Information/Warning/Critical).
For every flag that is set, the backup controller software 36 notifies the user through its normal notification methods (e.g. broadcast, email, SNMP, etc.), displaying the specified error message along with details to identify which tape drive 10 the error refers to, and the software label of the media for media related actions (flags 4 and 7). The notification identifies the severity of the error, and when multiple flags are set simultaneously they are listed in ascending order of severity (Information/ Warning/ Critical). It is possible to include error message filters in the backup controller software 36 so that only errors of a certain severity are notified to the user and/or specifying the mode of notification of errors of different severity. When multiple flags are set simultaneously, they may be associated together as a single error event, for example by displaying all of the associated error messages together in one dialogue box.
The backup controller software 36 does not fail a backup job based on the flag information. Rather, setting of the flags provides preventative maintenance information such that the user or the backup controller software 36 can initiate actions to prevent the failure occurring at all, and thus increases the reliability of the backup system. This facility also provides assistance in diagnosing/recovering a failing backup job.
The backup controller software 36 may be configured to automate the recommended maintenance/recovery actions, particularly if there are multiple tape drive 10s or autochangers present. For example, it could trigger performance of a cleaning cycle for flags 20 and 21, or a tape copy for flags 4 and 7, and retire the suspect media.
Typically, the backup controller software will be loaded into the memory of the host computer from a computer readable data carrying medium such as a floppy disk, mini-disk or optical disk (CD ROM). Alternatively, the software could be down-loaded accross a network such as the Internet from a source such as a World Wide Web or FTP server.
The above embodiment relates to a tape drive 10 but it will be understood that the present invention is relevant to any storage device which uses removable media and so is also relevant to optical disc drives.
TABLE 1__________________________________________________________________________No Flag Type Required Host Message Cause__________________________________________________________________________ 1 Read W The tape drive 10 is having problems The drive is having reading data. No data has been lost, severe trouble reading but there has been a reduction in the capacity of the tape. 2 Write W The tape drive 10 is having problems The drive is having writing data. No data has been lost, severe trouble writing but there has been a reduction in the capacity of the tape. 3 Hard W The operation has stopped because an The drive had a hard Error error has occurred while reading or read or write error writing data which the drive cannot correct. 4 Media C Your data is at risk: Media performance is 1. Copy any data you require from severely degraded this tape. 2. Do not use this tape again. 3. Restart the operation with a different tape. 5 Read C The tape is damaged or the drive is The drive can no Failure faulty. Call the tape supplier helpline. longer read data from the tape 6 Write C The tape is from a faulty batch or the The drive can no Failure tape drive 10 is faulty: longer write data to 1. Use a good tape to test the drive. the tape 2. If the problem persists, call the tape drive 10 supplier helpline. 7 Media W The tape cartridge has reached the The media has Life end of its useful life: exceeded its specified 1. Copy any data you need to another life tape 2. Discard the old tape. 8 Not Data W The tape cartridge is not data-grade. The drive has not been Grade Any data you back up to the tape is at able to read the MRS risk. stripes Replace the cartridge with a data- grade tape. 9 Write C You are trying to write to a write- Write command is Protect protected cartridge. attempted to a write Remove the write-protection or use protected tape another tape.10 No I You cannot eject the cartridge Manual or s/w unload Removal because the tape drive 10 is in use. attempted when Wait until the operation is complete prevent media removal before ejecting the cartridge. on11 Cleaning I The tape in the drive is a cleaning Cleaning tape Media cartridge. encountered during If you want to back up or restore, backup or restore insert a data-grade tape.12 Unsup- I You have tried to load a cartridge of Attempted loaded of ported a type which is not supported by this unsupported tape Format drive. format, e.g. DDS2 in The cartridge has been automatically DDS1 drive ejected.13 Snapped C The operation has failed because the Tape snapped in the Tape tape in the drive has snapped: drive 1. Discard the old tape. 2. Restart the operation with a different tape.20 Clean C The tape drive 10 needs cleaning: The drive thinks it has Now 1. If the operation has stopped, eject a head clog, or needs the tape and clean the drive cleaning 2. If the operation has not stopped, wait for it to finish and then clean the drive.21 Clean W The tape drive 10 is due for routine The drive is ready for Periodic cleaning: a periodic clean 1. Wait for the current operation to finish. 2. Then use a cleaning cartridge.22 Expired C The last cleaning cartridge used in the The cleaning tape has Cleaning tape drive 10 has worn out: expired Media 1. Discard the worn out cleaning cartridge. 2. Wait for the current operation to finish. 3. Then use a new cleaning cartridge.30 Hardware C The tape drive 10 has a hardware The drive has a A fault: hardware fault which 1. Eject the tape or magazine. is not read/write 2. Reset the drive (hold the unload related. button down for 5 seconds). 3. Restart the operation.31 Hardware C The tape drive 10 has a hardware The drive has a B fault: hardware fault which 1. Turn the tape drive 10 off and then is not read/write on again. related. 2. Restart the operation. 3. If the problem persists call the tape drive 10 supplier helpline.32 Interface W The tape drive 10 has a problem with The drive has the SCSI interface: identified an 1. Check the cables and cable interfacing fault connections. 2. Restart the operation.33 Eject C The operation has failed: Error recovery action Media 1. Eject the tape or magazine. 2. Insert the tape or magazine again. 3. Restart the operation.34 Download W The firmware download has failed Firmware download Fail because you have tried to use the failed incorrect firmware for this tape drive 10. Obtain the correct firmware and try again.40 Loader C The changer mechanism is having Loader mech. is Hardware difficulty communicating with the having trouble A tape drive 10: communicating with 1. Turn the autoloader off then on. the tape drive 10 2. Restart the operation. 3. If problem persists, call the tape drive 10 supplier helpline.41 Loader C A tape has been left in the autoloader Stray tape left in Stray by a previous hardware fault: loader after previous Tape 1. Insert an empty magazine to clear error recovery the fault. 2. If the fault does not clear, turn the autoloader off and then on again. 3. If the problem persists, call the tape drive 10 supplier helpline.42 Loader W There is a problem with the Loader mech. has a Hardware autoloader mechanism. hardware fault B43 Loader C The operation has failed because the Tape changer door Door autoloader door is open: open 1. Clear any obstructions from the autoloader door. 2. Eject the magazine and then insert it again. 3. If the fault does not clear, turn the autoloader off and then on again 4. If the problem persists, call the tape drive 10 supplier helpline.64__________________________________________________________________________
TABLE 2______________________________________7 6 5 4 3 2 1 0______________________________________ 0 Page Code 0x2e 1 Reserved (0) 2 Page Length 3 4 Parameter Code (1) 5 6 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 7 Parameter Length (1) 8 Read Flag 9 Parameter Code (2) 10 11 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 12 Parameter Length (1) 13 Write Flag 14 Parameter Code (3) 15 16 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 17 Parameter Length (1) 18 Hard Error Flag 19 Parameter Code (4) 20 21 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 22 Parameter Length (1) 23 Media Flag 24 Parameter Code (5) 25 26 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 27 Parameter Length (1) 28 Read Failure Flag 29 Parameter Code (6) 30 31 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 32 Parameter Length (1) Write Failure Flag 33 Parameter Code (7) 35 36 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 37 Parameter Length (1) 38 Media Life Flag 39 Parameter Code (8) 40 41 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 42 Parameter Length (1) 43 Not Data Grade Flag 44 Parameter Code (9) 45 46 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 47 Parameter Length (1) 48 Write Protect Flag 49 Parameter Code (0xA) 50 51 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 52 Parameter Length (1) 53 No Removal Flag 54 Parameter Code (0xB) 55 56 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 57 Parameter Length (1) 58 Cleaning Media Flag 59 Parameter Code (0xC) 60 61 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 62 Parameter Length (1) 63 Unsupported Format Flag 64 Parameter Code (0xD) 65 66 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0) 67 Parameter Length (1) 68 Tape Snapped Flag. . . Parameter Code (xx). . . DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0). . . Parameter Length (1). . . xxxxxxxxxxxxxxx 99 Parameter Code (0x14)100101 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)102 Parameter Length (1)103 Clean Now Flag104 Parameter Code (0x15)105106 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)107 Parameter Length (1)108 Clean Periodic Flag109 Parameter Code (16)110111 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)112 Parameter Length (1)113 Expired Cleaning Media Flag. . . Parameter Code (xx). . . DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0). . . Parameter Length (1). . . xxxxxxxxxxxxxxx149 Parameter Code (1E)150151 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)152 Parameter Length (1)153 Hardware A Flag154 Parameter Code (1F)155156 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)157 Parameter Length (1)158 Hardware B Flag159 Parameter Code (20)160161 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)162 Parameter Length (1)163 Interface Flag164 Parameter Code (21)165166 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)167 Parameter Length (1)168 Eject Media Flag169 Parameter Code (21)170171 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)172 Parameter Length (1)173 Download Fail Flag. . . Parameter Code (xx). . . DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0). . . Parameter Length (1). . . xxxxxxxxxxxxxxx199 Parameter Code (0x28)200201 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)202 Parameter Length (1)203 Loader Hardware A Flag204 Parameter Code (0x29)205206 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)207 Parameter Length (1)208 Stray Tape Flag209 Parameter Code (0x2A)210211 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)212 Parameter Length (1)213 Loader Hardware B Flag214 Parameter Code (0x2A)215216 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)217 Parameter Length (1)218 Loader Door Flag. . . Parameter Code (xx). . . DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0). . . Parameter Length (1). . . xxxxxxxxxxxxxxx319 Parameter Code (40)320321 DU(0) DS(1) TSD(0) ETC(0) TMC(0) Res(0) LP(0)322 Parameter Length (1)323 xxxxxxxxxxxxxxx______________________________________
TABLE 3______________________________________7 6 5 4 3 2 1 0______________________________________0 Page Code (0x1C)1 Page Length (0x0A)2 Perf Reserved DExcpt Test Reserved LogErr3 Reserved MRIE4 Interval Timer678 Report Count91011______________________________________

Number	Name	Date
4549295	Purvis	Oct 1985
5287478	Johnston et al.	Feb 1994
5361346	Panesar et al.	Nov 1994
5406425	Johnston et al.	Apr 1995
5412666	Squires et al.	May 1995
5444859	Baker et al.	Aug 1995
5450579	Johnson	Sep 1995
5450609	Schultz et al.	Sep 1995
5500940	Skeie	Mar 1996
5568606	Dobbek	Oct 1996
5615335	Onffroy et al.	Mar 1997
5617535	Aizawa et al.	Apr 1997
5684945	Chen et al.	Nov 1997
5717850	Apperley et al.	Feb 1998
5761411	Teague et al.	Jun 1998
5815650	Apperley et al.	Sep 1998
5828583	Bush et al.	Oct 1998
5832199	Apperley et al.	Nov 1998
5832204	Apperley et al.	Nov 1998
5835700	Carbonneau et al.	Nov 1998
5835703	Konno	Nov 1998

Storage system with procedure for monitoring low level status codes, deriving high level status codes based thereon and taking appropriate remedial actions

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CPC

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Entry
Webster's II New Riverside University Dictionary, definition of the word "translates", p. 1227, Dec. 1988.
IBM TDB, vol. 37, No. 02B, Feb. 1994, p. 241, "Keeping Users Aware of the Status of an Object Affected by Multiple Program".
IBM TDB, vol. 37, No. 06B, Jun. 1994, pp. 499-501, Operator Intervention Message Management for Tape Drive Displays.
European Search Report; EP 96305391.