From: Emmanuel Florac <eflorac@intellique.com>
To: Spelic <spelic@shiftmail.org>
Cc: xfs@oss.sgi.com
Subject: Re: Questions on RAID alignment
Date: Thu, 20 Sep 2012 14:05:37 +0200 [thread overview]
Message-ID: <20120920140537.11a50638@harpe.intellique.com> (raw)
In-Reply-To: <505AF9EA.7030603@shiftmail.org>
Le Thu, 20 Sep 2012 13:11:38 +0200
Spelic <spelic@shiftmail.org> écrivait:
> 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?
No, it's better to set your sw/su accordingly to your RAID setup
(example: 8 drives RAID-10 256k stripe -> su=256k,sw=4) and let
mkfs.xfs determine itself how many ag it wants, to adapt it both to the
striping and filesystem size.
> 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?
agcount will be adjusted by xfs_growfs AFAIK. For the other parameters,
not so much.
> 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?
>
I really have no idea on this.
--
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| Intellique
| <eflorac@intellique.com>
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next prev parent reply other threads:[~2012-09-20 12:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-20 11:11 Questions on RAID alignment Spelic
2012-09-20 12:05 ` Emmanuel Florac [this message]
2012-09-20 22:38 ` Dave Chinner
2012-09-20 23:11 ` Stan Hoeppner
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