Le Wed, 8 Jul 2015 20:54:54 +0200
"Mark Noon" <mnoon@xxxxxxx> écrivait:
> I'm trying to understand the proper values when formatting an xfs
> filesystem under a hardware raid controller and seem to get
> conflicting information between whats on the wiki and various mailing
> listings and forum posts when searching google. I have a system that
> will be storing images and other static content files accross a
> RAID50. The plan is to do 3 raid5 arrays each with 5 disks with a
> stripe size of 128K striped accross a raid0. I will then build a
> logical volume on top of this. When running mkfs.xfs should the
> correct settings be su=128k sw=12 (-1 parity 'disk' for each of the 3
> arrays) or su=128k sw=4 (only consider one of the arrays)? Also if I
> ever add a JBOD and extend the storage how does this change things
> esspecially given that it will be on a completely different raid
> volume just merged together via LVM? Thanks for the assitance!
You should probably go with the 128K su/12 sw value. It probably won't
make much difference.
When you'll extend your FS with LVM, your attempt at optimisation will
be completely nullified anyway :)
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