Re: New server setup

On Tue, Mar 12, 2013 at 09:41:08PM +0000, Gregg Jaskiewicz wrote:
> On 10 March 2013 15:58, Greg Smith <greg@2ndquadrant.com> 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@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +