On Mar 10, 2008, at 1:32, Richard Scobie wrote:
Oliver Martin wrote:Michael Guntsche schrieb:whenever possible. But if the fs starts 64KB into a 128KB stripe, every 128KB write will cause two RMW cycles. At least, that's how I understand it. Maybe there's something else involved and it really doesn't make a difference?As I understand it, XFS is smart enough to work with md RAID and automagically set the correct swidth and sunit sizes to suit the array.
That's true but only if you create a XFS filesystem on the md device directly. If LVM is in between mkfs.xfs cannot figure it out and you have to specify the values yourself.
Kind regards, Michael
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