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Backups Fail to be Performed

Publication Date:  2012-07-19 Views:  82 Downloads:  0
Issue Description
The tape caching policy is set to recycle the space after migration. When backups start to run, trigger the tape caching. After data of virtual tapes is migrated and space is recycled, refresh the cache. The tape status is caching. When you run the backup task, the I/O error is displayed.
Alarm Information
Handling Process
Enable the original backup set of the NetBackup to expire.
Root Cause
Two types of tape are available for tape caching: direct link tapes and cache tapes. After a cache tape is created, tape caching is triggered, and the disk space starts to be recycled, the cache tape will automatically switch to direct link tapes. In the next backup, the NetBackup reads and writes the corresponding section of the tape according to the catalog record. If all the previous backup sets have expired, the NetBackup reads and writes data from the tape head in overwriting mode. This enables the tape type to be changed from the direct link tape to the cache tape. If the tape has not expired, start the renew operation on the VTL manually. The tape is a sequential read and write device, so the NetBackup cannot identify the tape and has to read or write from a certain section of the tape. Consequently, I/O error information is displayed.