On Tue, Mar 12, 2013 at 09:41:08PM +0000, Gregg Jaskiewicz wrote: > On 10 March 2013 15:58, Greg Smith <greg@xxxxxxxxxxxxxxx> wrote: > > On 3/1/13 6:43 AM, Niels Kristian Schjødt wrote: > > Hi, I'm going to setup a new server for my postgresql database, and I > am considering one of these: http://www.hetzner.de/hosting/ > produkte_rootserver/poweredge-r720 with four SAS drives in a RAID 10 > array. Has any of you any particular comments/pitfalls/etc. to mention > on the setup? My application is very write heavy. > > > The Dell PERC H710 (actually a LSI controller) works fine for write-heavy > workloads on a RAID 10, as long as you order it with a battery backup unit > module. Someone must install the controller management utility and do > three things however: > > > We're going to go with either HP or IBM (customer's preference, etc). > > > > 1) Make sure the battery-backup unit is working. > > 2) Configure the controller so that the *disk* write cache is off. Only use SSDs with a BBU cache, and don't set SSD caches to write-through because an SSD needs to cache the write to avoid wearing out the chips early, see: http://momjian.us/main/blogs/pgblog/2012.html#August_3_2012 -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
