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Re: raid10n2/xfs setup guidance on write-cache/barrier

To: Jessie Evangelista <jessie.evangelista@xxxxxxxxx>
Subject: Re: raid10n2/xfs setup guidance on write-cache/barrier
From: keld@xxxxxxxxxx
Date: Thu, 15 Mar 2012 18:15:49 +0100
Cc: Linux RAID <linux-raid@xxxxxxxxxxxxxxx>, Linux fs XFS <xfs@xxxxxxxxxxx>
In-reply-to: <CAA8mOyDquGX0kEbQSpo=S0EYdNvXNBQ6ZLnb5Sc7uvCPYB+xqA@xxxxxxxxxxxxxx>
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On Fri, Mar 16, 2012 at 12:52:19AM +0800, Jessie Evangelista wrote:
> Hi keld,
> 
> On Thu, Mar 15, 2012 at 11:25 PM,  <keld@xxxxxxxxxx> wrote:
> > On Thu, Mar 15, 2012 at 02:07:25PM +0000, Peter Grandi wrote:
> >> >>> I want to create a raid10,n2 using 3 1TB SATA drives.
> >> >>> I want to create an xfs filesystem on top of it. The
> >> >>> filesystem will be used as NFS/Samba storage.
> >>
> >> Consider also an 'o2' layout (it is probably the same thing for a
> >> 3 drive RAID10) or even a RAID5, as 3 drives and this usage seems
> >> one of the few cases where RAID5 may be plausible.
> >
> > Well, for a file server like NFS/Samba, you could also consider raid10,f2.
> > I would think you could get about double the read performance compared to 
> > n2 and o2
> > layouts, and also for individual read transfers on a running system
> > you would get somthing like double the read performance.
> > Write performance could be somewhat slower (0 to 10 %) bot as users
> > are not waiting for writes to complete, they will probably not notice.
> 
> I also plan to try raid10f2. Did you do your own benchmarks or are you
> quoting someone elses?

Both, look at our wiki: 
https://raid.wiki.kernel.org/articles/p/e/r/Performance.html

Best regards
keld

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