On 08/24/2011 01:42 PM, David Boreham wrote:
On 8/24/2011 11:41 AM, Greg Smith wrote:
I've measured the performance of this drive from a couple of
directions now, and it always comes out the same. For PostgreSQL,
reading or writing 8K blocks, I'm seeing completely random workloads
hit a worst-case of 20MB/s; that's just over 2500 IOPS. It's quite
possible that number can go lower under pressure of things like
internal drive garbage collection however, which I believe is going
into the 600 IOPS figure. I haven't tried to force that yet--drive
is too useful to me to try and burn it out doing tests like that at
the moment.
I hope someone from Intel is reading -- it would be well worth their
while to just send you a few drives,
since you are set up to perform the right test, and can provide
impartial results.
Don't worry, they are. With the big firmware bug in the 320 series
lingering over things, it wasn't really worth wandering down that road
yet until this week. Now that they can ship me drives that are expected
to work, I can pick back up work on performance testing them.
--
Greg Smith 2ndQuadrant US greg@xxxxxxxxxxxxxxx Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us
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