NDMP: SMTAPE backups & slowness
I found the normal NDMP backups were slow so I switched to NDMP - SMTAPE backups to speed things up. That didn't happen because they were slower. I thought backing up 40 million files on NetApp using smtape would be better. The normal NDMP backups ran about 20,000 KB/s the smtape version runs about 12-14,000 KB/s. Media servers have no performance issues as they are not fully utilised and everything is on a 10Gb/s IP network.
The only thing I have left to play with is SIZE_DATA_BUFFERS_NDMP buffer size. Currently on the default which is close to the maximium according to http://www.symantec.com/docs/TECH51967.
- Would decreasing the buffer size would help, given that it is a 10Gb network?
- In NetApp can NDMP be throttled? The NetApp admins may have throttling turned on
- Is there anything better than this to test NetApp by doing a dump to /dev/null by runing something like
dump 0f null /vol/vol0
Thanks for your assistance