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An Error Is Reported on Manually Updating Tape Cache and Starting a Backup Task After Reclaiming Tape Cache Space

Publication Date:  2015-07-31 Views:  58 Downloads:  0
Issue Description
Products and versions:

VTL3500 V100R002
VTL6000 V100R003

Set the tape cache reclamation policy to immediate for tape caching to be triggered once a backup task is started. Update the cache after the virtual tape data is migrated and the free space is reclaimed. The tapes enter the cached state. Restart the backup task and the NetBackup reports an error. The symptom is:

In the navigation tree of the NetBackup Administration Console, choose NetBackup Management > Catalog. A backup set is found, indicating that the backup set has not expired. As a result, the backup task fails to be started.
Handling Process
Method 1: On the NetBackup Administration Console, make the backup set expire.

1.  In the navigation tree of the NetBackup Administration Console, choose NetBackup Management > Catalog.

2.  In the function pane, click Search Now.

3.  Right-click the backup set and select Expire.

Method 2: Make the backup set expire using a Secure Shell (SSH) tool.

1.  Run the cd /usr/openv/netbackup/bin/admincmd/ command.

nas:~ # cd /usr/openv/netbackup/bin/admincmd/

2. Run the ./bpexpdate command.

nas:/usr/openv/netbackup/bin/admincmd # ./bpexpdate XXXXXXXX

XXXXXXXX is the tape's barcode.
Root Cause
Tape caching covers two types of tapes: direct-link tapes and cache tapes.

After a cache tape is created and tape caching is triggered to reclaim its free space, this cache tape is automatically converted into a direct-link tape. In the next backup task, the NetBackup will access the segments specified record.
  • If all previous backup sets on the tape have expired, the NetBackup accesses the tape head first and overwrites existing data. The VTL then converts the tape type from a direct-link tape to a cache tape.
  • If all previous backup sets on the tape have not expired, you need to manually update the tape on the VTL. Because tapes are sequential read/write devices, the NetBackup cannot identify them and still accesses the segments in the middle. As a result, an I/O error is reported.

END