| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Greg Smith <greg(at)2ndquadrant(dot)com> |
| Cc: | Merlin Moncure <mmoncure(at)gmail(dot)com>, 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: | 2009-11-28 16:20:56 |
| Message-ID: | 200911281620.nASGKu410356@momjian.us |
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| Lists: | pgsql-performance |
Greg Smith wrote:
> Merlin Moncure wrote:
> > I am right now talking to someone on postgresql irc who is measuring
> > 15k iops from x25-e and no data loss following power plug test.
> The funny thing about Murphy is that he doesn't visit when things are
> quiet. It's quite possible the window for data loss on the drive is
> very small. Maybe you only see it one out of 10 pulls with a very
> aggressive database-oriented write test. Whatever the odd conditions
> are, you can be sure you'll see them when there's a bad outage in actual
> production though.
>
> A good test program that is a bit better at introducing and detecting
> the write cache issue is described at
> http://brad.livejournal.com/2116715.html
Wow, I had not seen that tool before. I have added a link to it from
our documentation, and also added a mention of our src/tools/fsync test
tool to our docs.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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