On Mon, Aug 12, 2013 at 08:33:04AM -0700, Joshua D. Drake wrote: > >1) Has anyone had experience with Intel 520 SSDs? Are they reliable? > >When they fail, do they fail nicely (ie, failure detected and bad drive > >removed from RAID array) or horribly (data silently corrupted...) ? > > I don't recall if the 520s have powerloss protection but you will > want to check that. I am pretty sure they don't. The only options are the Intel 320 and 710, I think. Here is a blog about it: http://blog.2ndquadrant.com/intel_ssds_lifetime_and_the_32/ Look for "Enhanced Power Loss Data Protection". Intel does not make it easy to find all drive that have it --- you have to look at each spec sheet. > >2) Is this RAID arrangement sensible? I've seen reports where some > >people keep the pg_xlog directory on a separate RAID array, but I > >don't really see the advantage with SSDs. > > Put the pg_xlog on spindles, they are more than fast enough and > won't eat up the write life of your SSDs. Given its small size and need for fast fsync, I have WAL on SSDs, and the data on magnetic disk. You are right the WAL can generate a lot of writes, but just use smartctl monitoring and replace the SSD when needed. -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
