---- Original message ---- >Date: Mon, 15 Aug 2011 19:49:52 -0400 >From: pgsql-performance-owner@xxxxxxxxxxxxxx (on behalf of Greg Smith <greg@xxxxxxxxxxxxxxx>) >Subject: Reports from SSD purgatory >To: "pgsql-performance@xxxxxxxxxxxxxx" <pgsql-performance@xxxxxxxxxxxxxx> > >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@xxxxxxxxxxxxxxx Baltimore, MD >PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us > > >-- >Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) >To make changes to your subscription: >http://www.postgresql.org/mailpref/pgsql-performance -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
