IBM Support

ANR8555E An error (21) occurred during a read operation from disk <name>

Troubleshooting


Problem

The migration process fails to migrate data from a disk storage pool and fails with error ANR8555E.

Symptom

A Tivoli Storage Manager server uses an external disk array as a DISK storage pool storage. One of the physical disks encounters a problem and goes offline in the DISK array. Once the physical disk is again online in the disk array, the migration process which tries to read from volumes stored on the affected disk volume fails with the ANR8355E. The activity log shows the following messages :

ANR2110I MIGRATE STGPOOL started as process nn. (SESSION: xxx, PROCESS: nn)
ANR1000I Migration process nn started for storage pool MY_DISKPOOL manually, highMig=90, lowMig=0, duration=No. (SESSION: xxx, PROCESS: nn)
...
ANR8555E An error (21) occurred during a read operation from disk D:\TSMPOOL\DISK1.DSM. (SESSION: xxx, PROCESS: nn)

Diagnosing The Problem

In the ANR8355E error message, the error (21) is an error returned by Windows when TSM tries to read from the disk storage pool voume (D:\TSMPOOL\DISK1.DSM in this case). Error 21 is an error returned by Windows which means :

ERROR_NOT_READY
21 (0x15)
The device is not ready.

So, Windows has a problem with the file and the Tivoli Storage Manager server is unable to read from it.

Resolving The Problem

Resolve any issue with the affected drive/file with Windows. In this case, the affected drive is D: and the affected file is D:\TSMPOOL\DISK1.DSM. Run a CHKDSK on Windows to resolve potential disk problems with the drive and/or file.
Once this is done, run an AUDIT VOLUME with the Tivoli Storage Manager server. For example :

audit volume D:\TSMPOOL\DISK1.DSM fix=yes

You can then move the data to other volumes in the same storage pool or other pool using the MOVE DATA command.
Any data left on the volume can then either be recovered from copy pool using the RESTORE VOLUME command (if the data has been copied to a copy pool) or the volume can then be deleted and redefined (if the data was not copied to a copy pool).

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Document Information

Modified date:
17 June 2018

UID

swg21633822