| From: | Greg Smith <greg(at)2ndquadrant(dot)com> |
|---|---|
| To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
| Cc: | Brad Nicholson <bnichols(at)ca(dot)afilias(dot)info>, Karl Denninger <karl(at)denninger(dot)net>, Laszlo Nagy <gandalf(at)shopzeus(dot)com>, pgsql-performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: SSD + RAID |
| Date: | 2009-11-18 06:32:01 |
| Message-ID: | 4B0394E1.6010403@2ndquadrant.com |
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| Lists: | pgsql-performance |
Merlin Moncure wrote:
> But what's up with the 400 iops measured from bonnie++?
I don't know really. SSD writes are really sensitive to block size and
the ability to chunk writes into larger chunks, so it may be that Peter
has just found the worst-case behavior and everybody else is seeing
something better than that.
When the reports I get back from people I believe are competant--Vadim,
Peter--show worst-case results that are lucky to beat RAID10, I feel I
have to dismiss the higher values reported by people who haven't been so
careful. And that's just about everybody else, which leaves me quite
suspicious of the true value of the drives. The whole thing really sets
off my vendor hype reflex, and short of someone loaning me a drive to
test I'm not sure how to get past that. The Intel drives are still just
a bit too expensive to buy one on a whim, such that I'll just toss it if
the drive doesn't live up to expectations.
--
Greg Smith 2ndQuadrant Baltimore, MD
PostgreSQL Training, Services and Support
greg(at)2ndQuadrant(dot)com www.2ndQuadrant.com
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