mkfs.xfs -d su=XXX,sw=YYY and future volume resize

[Marcin Sura]

Hi,

When I create filesystem I can specify su and sw paramteres which match
underlying storage device.
So for example, If I have raid 6 volume made of 6 + 2 disks with stripe
size of 256k I create xfs with:

mkfs.xfs -d su=256k,sw=6 <disk>

But what if I will extend original volume by 2 disks. sw will 8. Will be
there a performance panelty compared to filesystem created from scratch
with correct sw parameter?

BR
Marcin
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