On Wed, Dec 10, 2008 at 9:05 AM, Mario Weilguni <mweilguni@xxxxxxxx> wrote: > In fact, for this system we're currently going to RAID10, I'm convinced now. > With other systems we have, RAID5 is a safe option for one reason, the > machines are clusters, so we have (sort of) RAID50 here: > Machine A/RAID5 <-- DRBD --> Machine B/RAID5 > > Seems reliable enough for me. But in this case, the machine will be > standalone, and so RAID5 might really not be the best choice. > > However, I'm pretty sure we'll have the same problems with RAID10, the > problem seems to have to do with P400 and/or SATA drives. Yeah, I'm thinking there's something off in your system and until you resolve it you're going to have issues. I'd check the following: firmware on RAID controller how it runs with a couple of SAS drives in RAID-1 or RAID-0 (just for testing) OS version / kernel version / driver version. especially compared to your customer's machine. See how much of his environment you can clone until performance goes up where it should be. Then change one thing at a time until you break it again. I'm sure everyone here would like to know what makes a P400 fast or slow. Or, if you don't have time to mess with it, just order an escalade or areca card and be done with it. :) -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
