Jeffrey W. Baker wrote: > On Tue, 2005-08-16 at 10:46 -0700, Roger Hand wrote: >> The disks are ext3 with journalling type of ordered, but this was later >> changed to writeback with no apparent change in speed. >> >> They're on a Dell poweredge 6650 with LSI raid card, setup as follows: >> 4 disks raid 10 for indexes (145GB) - sdc1 >> 6 disks raid 10 for data (220GB) - sdd1 >> 2 mirrored disks for logs - sdb1 >> >> stripe size is 32k >> cache policy: cached io (am told the controller has bbu) >> write policy: write-back >> read policy: readahead > > I assume you are using Linux 2.6.
Oops, sorry I left that out. Nope, we're on 2.4: [EMAIL PROTECTED] ~]$ uname -a Linux xxx.xxx.xxx 2.4.21-27.0.2.ELsmp #1 SMP Wed Jan 12 23:35:44 EST 2005 i686 i686 i386 GNU/Linux It's RedHat Enterprise AS3.0 Fri Nov 5 17:55:14 PST 2004 > Have you considered booting your > machine with elevator=deadline? I just did a little Googling and see that the 2.4 kernel didn't have a decent elevator tuning system, and that was fixed in 2.6. Hmmm .... Thanks for the ideas ... -Roger ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
