Backup Exec 2012 - slow NDMP restore
I would need some additional thoughts about a setup that i'm setting up for the moment.
- 2 NetApp Storage Arrays (V-series for active data / FAS2240 for SnapVaulting)
- Snapvault data from V-Series to FAS2240.
- Tape library is direct-attached to the FAS2240.
- Tape library type: HP MSL8096 4 LTO4 drives. All components are up-to-date with the latest available firmware.
- Backup Exec 2012 + NDMP option is used.
- ONTAP version 8.1 7-mode.
- Backup data are LUN's presented via FC (No NFS!). Lun restore is a file of the original size of the LUN.
- Backup job sizes varies between 130GB and 6000GB.
- FAS2240 only performs "normal" operations (SIS + SnapVaulting) and does not perform any host IO. This is a passive array.
- Backup speed (block size on the tape drive: 64kb) varies between 8800mb/min and 2000mb/min.
- Restore speeds not acceptable.
- Backup'ped volume: 127GB
- Backupspeed (tape block size 64kb) : 1746MB/min and 4517MB/min (7 jobs in total);
- Backupspeed (tape block size 256kb) : 4398MB/min (1 job)
- Restorespeed (tape block size 64kb) : 340MB/min (1 job)
- Restorespeed (tape block size 256kb) : 700MB/min (1 job)
- During the restore test:
- Changing the block size of the tape drives. This optimalizes the restore performance in a certain way, but it's not the result that we need. Results above.
- Disabling the DAR (Direct Access Recovery) has no impact on the backupspeed. For more information: http://www.symantec.com/business/support/index?page=content&id=TECH155604.
- Partial restore and entire NetApp Volume restore;
- NDMP parameter tweaking: http://www.symantec.com/business/support/index?page=content&id=TECH65615. This is not applicable in our environment, because the tape drives are directly attached.
- Different tape drives --> no better performance.
Any other thoughts how I can optimalize the speed of the restore?