Date: Thu, 17 Apr 2008 15:23:01 +0100 From: "Joao Barros" <joao.barros@gmail.com> To: "Daniel Andersson" <engywook@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: Choppy performance. Message-ID: <70e8236f0804170723i13136c11scca7a818a7ffc89b@mail.gmail.com> In-Reply-To: <24adbbc00804151529m2a74085ds468eaac55ba94a32@mail.gmail.com> References: <24adbbc00804151529m2a74085ds468eaac55ba94a32@mail.gmail.com>
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On Tue, Apr 15, 2008 at 11:29 PM, Daniel Andersson <engywook@gmail.com> wrote: > > I just noticed that I didn't set vfs.zfs.prefetch_disable=1. I don't get the > deadlocks but could > the prefetch_disable fix my problem? > Turning off prefetch improved my workload (I play video from it for ex, no more skiped frames) > > I'm currently running a raidz pool with only two disks. Is there some way to > turn > off the mirroring? I don't really care if the stuff on the disks get > corrupted/broken. > I would however like to get 1TB instead of 500MB. =P raidz isn't mirroring, that would be the mirror option. You loose one disk's storage for parity when you use raidz, and since you only added 2 disks to that raidz you lose 50% of your storage space. It has the appearance of mirroring but in fact it's not. Your choice of a raidz was wrong for what you really needed and you have to destroy the raidz pool to be able to change it. Instead of using: zpool create yourpoolname raidz disk1 disk2 use: zpool create yourpoolname disk1 disk2 -- Joao Barros
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