On 9.10.2012 01:03, Craig James wrote: > > > On Mon, Oct 8, 2012 at 3:50 PM, Claudio Freire <klaussfreire@xxxxxxxxx > <mailto:klaussfreire@xxxxxxxxx>> wrote: > > On Mon, Oct 8, 2012 at 7:48 PM, Craig James <cjames@xxxxxxxxxxxxxx > <mailto:cjames@xxxxxxxxxxxxxx>> wrote: > >> > # blockdev --getra /dev/sdb1 > >> > 256 > >> > >> > >> It's probably this. 256 is way too low to saturate your I/O system. > >> Pump it up. I've found 8192 works nice for a system I have, 32000 I > >> guess could work too. > > > > > > But again ... the two systems are identical. This can't explain it. > > Is the read-ahead the same in both systems? > > > Yes, as I said in the original reply (it got cut off from your reply): > "Same on both servers." And what about read-ahead settings on the controller? 3WARE used to have a read-ahead settings on their own (usually there are three options - read-ahead, no read-ahead and adaptive). Is this set to the same value on both machines? Tomas -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
