From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Magnus Naeslund(k)" Subject: Re: Raid 1 (non) performance Date: Mon, 20 Nov 2006 15:12:19 +0100 Message-ID: <4561B7C3.7030000@kite.se> References: <455B4609.6090905@kite.se> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: dean gaudet Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids dean gaudet wrote: > > i see you have split /var and / on the same spindle... if your /home is on > / then you're causing extra seek action by having two active filesystems > on the same spindles. another option to consider is to make / small and > mostly read-only and move /home to /var/home (and use a symlink or mount > --bind to place it at /home). > Yes I have it like this now: /var/bind/home on /home type bind (rw,bind,noatime) > hopefully your swap isn't being used much anyhow. > Zero used, infact. > try "iostat -kx /dev/sd* 5" and see if the split is causing you troubles > -- i/o activity on more than one partition at once. > It seems to be roughly the same numbers on the disks. > turning off write caching is a recipe for disasterous performance on most > ata disks... unfortunately. better to buy a UPS and set up nut or apcupsd > or something to handle shutdown. or just take your chances. > This is a mail server, I would like it to not lose mail if there is an power outage. Is there anything one can do without buying more hardware? Thanks for the feedback, Magnus