OmniBack performance with mincache=direct

[David S. Bell]

On a recomendation from Oracle we added the mincache=direct,convosync=direct to the mounts for out SAP database filesystems. Since then the omniback backup has been running VERY slowly trying to backup these filesystems.
Anyone had this problem?

Dave Bell

[A. Clay Stephenson]

You need to set the OB2VXDIRECT=1 environment
variable in /opt/omni/.omnirc on all boxes where the disk agent(s) run. This allows OmniBack to make the same optimizations that ORACLE/SAP do with the mincache and convosync options set. You also need to make sure that the VxFS patches have been applied.

[A. Clay Stephenson]

Another thought, since you obviously have OnlineJFS you could snapshot mount the ORACLE data fiolesystem(s) and then you wouldn't care how long the backup took.

[David S. Bell]

Thanks, I knew there had to be an explanation ot some switch in OmniBack. Next question is what does it do to the filesystems that do not have the mincache option set?

[A. Clay Stephenson]

As long as you have the latest OB2 and VxFS patches installed there are no performance hits
regardless of mount options. The patches are actually related to integrity.