AIX block-level backup ignores new data if volume device size increases after backup

Article ID: UFS0009 Volume device size increase or decrease after a backup is ignored by the CVBF block-level driver.

Symptom

On AIX clients-

  • If the volume device size increases after a backup, data written to the new space is not backed up.
  • If the volume device size shrinks after a backup, there is no effect on the backed-up data.?

The job does not fail but there is potential for data loss if the volume device size increases. 

For example: 

If the volume size is 2 GB and after backup it changes to 4 GB, then data that is written in the extra 2 GB disk space will not be backed up. 

If the volume size changes to 1 GB after backup, the entire volume of 2 GB will be backed up.  

Cause

Change in volume device size after a backup is not handled by the CVBF driver on AIX clients.

 

Resolution

Detach and re-attach the volume device using the following steps:

  1. From the CommCell Browser, expand Client Computersclient > File System > backup set.
  2. Right-click the subclient and then click Properties.

    The Subclient Properties dialog box appears.

  3. On the Advanced Options tab, clear the Optimized for File system with large number of small files(Block Level Backup) check box to detach the volume device, and then click OK.
  4. Right-click the subclient again, and then click Properties.

    The Subclient Properties dialog box appears.

  5. On the Advanced Options tab, select the Optimized for File system with large number of small files(Block Level Backup) check box to re-attach the volume device, and then click OK.