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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: Brian Candler <B.Candler@xxxxxxxxx>
Date: Fri, 16 Mar 2012 17:15:09 +0000
Cc: Peter Grandi <pg@xxxxxxxxxxxxxxxxxxxx>, Linux RAID <linux-raid@xxxxxxxxxxxxxxx>, Linux fs XFS <xfs@xxxxxxxxxxx>
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On Fri, Mar 16, 2012 at 11:36:07AM +0800, Jessie Evangelista wrote:
> I'm still scouring the internet for a best practice recipe for
> implementing xfs/mdraid.
> I am open to writing one and including the inputs everyone is contributing 
> here.
> In my search, I also saw some references of alignment issues for partitions.
> this is what I used to setup the partitions for the md device
> 
> sfdisk /dev/sdb <<EOF
> unit: sectors
> 
> 63,104872257,fd
> 0,0,0
> 0,0,0
> 0,0,0
> EOF
> 
> I've read a recommendation to start the partition on the 1MB mark.
> Does this make sense?

I would just make the raw disks members of the RAID array, e.g.
/dev/sdb, /dev/sdc etc and not partition them.

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