Date: Thu, 17 Apr 2008 17:42:25 +0200 From: "Daniel Andersson" <engywook@gmail.com> To: "Joao Barros" <joao.barros@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: Choppy performance. Message-ID: <24adbbc00804170842l28ca072fta081ea02ab70f3bd@mail.gmail.com> In-Reply-To: <70e8236f0804170723i13136c11scca7a818a7ffc89b@mail.gmail.com> References: <24adbbc00804151529m2a74085ds468eaac55ba94a32@mail.gmail.com> <70e8236f0804170723i13136c11scca7a818a7ffc89b@mail.gmail.com>
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>Turning off prefetch improved my workload (I play video from it for > >ex, no more skiped frames) > Okay, I'll try it. Guess I'll have to reboot..=D > >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. I suspected it was something like that, for the lack of a better word I used mirroring. Thanks for clearing it up for me! >Instead of using: > >zpool create yourpoolname raidz disk1 disk2 > >use: > >zpool create yourpoolname disk1 disk2 Okay, I'll try that. I guess I was a little too eager to try out ZFS and didn't read up properly. =P >Ruslan Wrote: > I have the same problem - rtorrent to hang temporarily during high load. >Today I installed additional 2 GB RAM and now I have 4Gb. With this >configuration hanging is more less but still exist (during ZFS upload data to >pool and swap use>0). >Seems, If swap not used (=0) then no any hanging. >So, More RAM - more beter. Okay. My server box's mobo only has two slots for RAM.=( A curious thing happened today with rtorrent. I had set rtorrent so that it couldn't use more than 3072MB of ram. (2048MB RAM + swap). rtorrent said it was using 2800MB but when I checked with top the swap wasn't in use at all?
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