<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>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.</div>
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<div>When running mkfs.xfs should the correct settings be <span style="line-height: 1.6em;">su=128k sw=12 (-1 parity 'disk' for each of the 3 arrays) or su=128k sw=4 (only consider one of the arrays)? </span></div>
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<div><span style="line-height: 1.6em;">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?</span></div>
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<div><span style="line-height: 1.6em;">Thanks for the assitance!</span></div>
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