Re: Reports from SSD purgatory

---- Original message ----
>Date: Mon, 15 Aug 2011 19:49:52 -0400
>From: pgsql-performance-owner@postgresql.org (on behalf of Greg Smith <greg@2ndQuadrant.com>)
>Subject: [PERFORM] Reports from SSD purgatory
>To: "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
>
>News update for anyone else who's trapped like me, waiting for a fix to
>the Intel 320 SSD bug where they can truncate themselves to 8MB.  Over
>the weekend Intel has announced a firmware fix for the problem is done,
>and is due to ship "within the next two weeks":
>http://communities.intel.com/thread/24121
>
>On the larger SSD reliability front, Tom's Hardware surveyed heavy SSD
>users they're friendly with who use Intel drives.  The most interesting
>data came from Softlayer:
>http://www.tomshardware.com/reviews/ssd-reliability-failure-rate,2923-6.html
>
>This supports two claims I made before based on my private data that
>were controversial:
>
>-Annualized SSD failure rates are not significantly lower than
>traditional drives in the first couple of years.  Jury is still out on
>whether they will spike upwards starting at 3 years as mechanical ones do.
>
>-The most common source of dead drives is sudden, catastrophic
>electronics failure.  These are not predicted by SMART, and have nothing
>to do with hitting the drive's wear limits.

It's worth knowing exactly what that means.  Turns out that NAND quality is price specific.  There's gooduns and
baduns. Is this a failure in the controller(s) or the NAND? 

Also, given that PG is *nix centric and support for TRIM is win centric, having that makes a big difference in
performance.  


>
>--
>Greg Smith   2ndQuadrant US    greg@2ndQuadrant.com   Baltimore, MD
>PostgreSQL Training, Services, and 24x7 Support  www.2ndQuadrant.us
>
>
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