Disk Drive Errors and Failure Recovery

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Disk Drive Error Identification

To determine the source of a disk drive error:

Run the Disk Space Analysis Program (DSAP) on the disk volume that is having

problems; for example:

1>DSAP $SYSTEM

DSAP reports disk drive errors such as unspared defective sectors or doubly

allocated file extents. If your disk drive is active, DSAP might not be able to

perform the extent check.

2 If DSAP reports unspared defective sectors, use the SCF INFO DISK, BAD

command to confirm that the sectors have not been spared; for example:

2>SCF INFO $SYSTEM,BAD

If the SCF INFO DISK, BAD command confirms that there are unspared defective

sectors, spare these defective sectors.

3 If DSAP reports any doubly allocated file extents, correct them by performing the

procedure for correcting doubly allocated file extents provided in the SCF

Reference Manual for the Storage Subsystem.

4 If the DSAP report does not indicate the source of the disk drive error, refer to Disk

Drive Error Troubleshooting Using OSM or TSM Software to perform general disk

drive tests and track any disk drive errors being recorded.

5 If disk performance seems to be the source of the disk drive error, use one of the

following utilities:

The Disk Compression Program (DCOM), which compresses the free space

of a disk volume to minimize file fragments. Refer to the Guardian Disk and

Tape Utilities Reference Manual for information about using DCOM to

compress free space on disks.

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Measure, which is a tool for collecting performance statistics on system

resources. You can use the data provided by Measure to balance the work

load. Refer to the Measure Reference Manual for more information.

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Summary of content (5 pages)

PAGE 1
Disk Drive Error Identification To determine the source of a disk drive error: 1 Run the Disk Space Analysis Program (DSAP) on the disk volume that is having problems; for example: 1>DSAP $SYSTEM DSAP reports disk drive errors such as unspared defective sectors or doubly allocated file extents. If your disk drive is active, DSAP might not be able to perform the extent check.
PAGE 2
Disk Drive Error Troubleshooting Using OSM or TSM Software For more information about OSM software, see OSM online help and the OSM User's Guide. For more information about TSM client software, see TSM online help and the TSM Online Guide. OSM Service Connection or TSM Service Application Action Test Verify Validate Checksum Responsive Test Alarms Events Description This action runs a vendor-supplied power-on self-test (POST) that checks the internal circuitry of the disk drive.
PAGE 3
Disk Drives: Diagnosing a HARDDOWN Substate If a Disk Drive Is HARDDOWN During... Diagnostic Action Installation of an internal disk drive Use the SCF STATUS DISK command to check the states of the disk paths. Installation of a PMF CRU Use the SCF STATUS DISK command to check the disk path states for each disk configured to use the PMF CRU along with the disk path states for each IOMF CRU and ServerNet/DA associated with this PMF CRU.
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Disk Drive Start Failure Recovery If a disk drive does not start, the problem could be related to the SCF object state of the disk drive. If the disk drive is in one of the following SCF object states, use the SCF RESET DISK command before you try to use the disk drive: ● STOPPED state, HARDDOWN substate ● SERVICING state, TEST substate ● SERVICING state, SPECIAL substate The SCF RESET DISK command leaves the disk drive in the STOPPED state, DOWN substate. From this state, the disk drive can be started.
PAGE 5
Disk Drive Revive Failure Recovery If a disk revive operation receives a checksum error or nonfatal error, the SCF START DISK command retries the disk revive operation at the current address until either the operation is successful or the operation suspends or stops. If the disk revive operation suspends or stops, refer to the SCF Reference Manual for the Storage Subsystem. A disk revive operation might display errors when you use the SCF START DISK command.