On Sun, Feb 13, 2011 at 1:12 PM, sergey <sergey.on.net@xxxxxxxxx> wrote: > Hello, > > I got a disk array appliance of 8 disks 1T each (UltraStor RS8IP4). It will > be used solely by PostgresQL database and I am trying to choose the best > RAID level for it. > > The most priority is for read performance since we operate large data sets > (tables, indexes) and we do lots of searches/scans, joins and nested > queries. With the old disks that we have now the most slowdowns happen on > SELECTs. > > Fault tolerance is less important, it can be 1 or 2 disks. > > Space is the least important factor. Even 1T will be enough. > > Which RAID level would you recommend in this situation. The current options > are 60, 50 and 10, but probably other options can be even better. Unless testing shows some other level is better, RAID-10 is usually the best. with software RAID-10 and 24 disks I can flood a 4 channel SAS cable with sequential transfers quite easily, and for random access it's very good as well, allowing me to reach about 5 to 6k tps with a large pgbench db (-i -s 4000) ~ 40Gig -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
