On 8/17/2011 1:35 PM, k...@rice.edu wrote:
On Wed, Aug 17, 2011 at 01:32:41PM -0500, Ogden wrote:
On Aug 17, 2011, at 1:31 PM, k...@rice.edu wrote:
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?
The benchmark results are here:
http://malekkoheavyindustry.com/benchmark.html
Thank you
Ogden
That looks pretty normal to me.
Ken
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.
Regards,
Ken
A while back I tested ext3 and xfs myself and found xfs performs better
for PG. However, I also have a photos site with 100K files (split into
a small subset of directories), and xfs sucks bad on it.
So my db is on xfs, and my photos are on ext4.
The numbers between raid5 and raid10 dont really surprise me either. I
went from 100 Meg/sec to 230 Meg/sec going from 3 disk raid 5 to 4 disk
raid 10. (I'm, of course, using SATA drives.... with 4 gig of ram...
and 2 cores. Everyone with more than 8 cores and 64 gig of ram is off
my Christmas list! :-) )
-Andy
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