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

To: Linux RAID <linux-raid@xxxxxxxxxxxxxxx>, Linux fs XFS <xfs@xxxxxxxxxxx>
Subject: Re: raid10n2/xfs setup guidance on write-cache/barrier
From: Jessie Evangelista <jessie.evangelista@xxxxxxxxx>
Date: Fri, 16 Mar 2012 00:52:19 +0800
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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?
>
> best regards
> keld

thanks for chiming in. have a nice day

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