From: hpa@zytor.com (H. Peter Anvin)
To: linux-raid@vger.kernel.org
Subject: RAID6 on PowerPC is faulty
Date: Thu, 15 Sep 2005 04:31:54 +0000 (UTC) [thread overview]
Message-ID: <dgatfq$mrq$1@terminus.zytor.com> (raw)
If you have been running RAID6 on a PowerPC with Altivec, your RAID is
not two-disk redundant, due to bad Q syndrome computation.
It *is* one-disk redundant, however.
The following patch will fix it:
http://www.kernel.org/pub/linux/kernel/people/hpa/raid6-altivec-fix.patch
.. however, it will not correct an existing array without rewriting
every stripe.
Neil, is there any way to force md to recompute all the syndromes?
-hpa
next reply other threads:[~2005-09-15 4:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-15 4:31 H. Peter Anvin [this message]
2005-09-15 4:44 ` RAID6 on PowerPC is faulty Neil Brown
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