sunit & swidth on RAID-1?

[Michael Monnerie]

On Mittwoch 11 Februar 2009 mike dentifrice wrote:
>         sunit=0      swidth=0 blks, unwritten=1
>         sectsz=512   sunit=0 blks
>
> What's the consequence of 0 values in this case?

XFS then knows that 512 byte (aka sector) alignment is sufficient, as 
RAID-1 will only write 512b to each disk and does not need full stripe 
unit writes like RAID-4/5/6 need. Therefore performance is better with 
the values you have.

mfg zmi
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