On Wed, Aug 17, 2011 at 01:26:56PM -0500, Ogden wrote:
I am using bonnie++ to benchmark our current Postgres system (on RAID 5) with the new one we have, which I have configured with RAID 10. The drives are the same (SAS 15K). I tried the new system with ext3 and then XFS but the results seem really outrageous as compared to the current system, or am I reading things wrong?
But such a jump from the current db01 system to this? Over 20 times difference from the current system to the new one with XFS. Is that much of a jump normal?
Ogden
Yes, RAID5 is bad for in many ways. XFS is much better than EXT3. You would get similar results with EXT4 as well, I suspect, although you did not test that.
i tested ext4 and the results did not seem to be that close to XFS. Especially when looking at the Block K/sec for the Sequential Output.