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Questions on RAID alignment

To: xfs@xxxxxxxxxxx
Subject: Questions on RAID alignment
From: Spelic <spelic@xxxxxxxxxxxxx>
Date: Thu, 20 Sep 2012 13:11:38 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120714 Thunderbird/14.0
Hello list
a few questions

1- Does XFS support alignment to concatenation RAIDs (e.g. linear over raid1) similarly to striped ones? I am guessing probably su and sw should not be specified and the agcount should be multiple of the number of the concatenated devices, is that correct?

2- Can mkfs parameters be altered after creation, e.g. after growing a RAID and then growing the XFS fs, can I also alter su, sw, agcount somehow?

3- I seem to remember there was an xattr that one could attach to /home (if /home was under XFS) so that every user (subdir of /home) would get a different AG in a different RAID device. I cannot find that information anymore on the internet; could you refresh my mind?

Thank you

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