From: Neil Brown <neilb@suse.de>
To: Dexter Filmore <Dexter.Filmore@gmx.de>
Cc: linux-raid@vger.kernel.org
Subject: Re: no journaling and loops on softraid?
Date: Tue, 6 Mar 2007 10:32:51 +1100 [thread overview]
Message-ID: <17900.43171.838082.323657@notabene.brown> (raw)
In-Reply-To: message from Dexter Filmore on Monday March 5
On Monday March 5, Dexter.Filmore@gmx.de wrote:
> http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID#Data_Scrubbing
>
> "Warning: Be aware that the combination of RAID5 and loop-devices will most
> likely cause severe filesystem damage, especially when using ext3 and
> ReiserFS. Some users suggest that XFS is not affected by this, but this has
> not been entirely confirmed. See kernel bug 6242 for updates on this bug.
>
> Note: There are also reports that Journaled Filesystems are problematic on all
> Software-RAID levels. No kernel bugs have been submitted regarding this bug
> as of yet. A number of the reports involve using cryptoloops which are known
> to cause corruption. See http://forums.gentoo.org/viewtopic-t-412467.html for
> more information. This thread should be taken with a grain of salt."
>
> Can someone shed some light on this? I have XFS on my raid and *had* problems
> when unpacking large archives with many small files.
>
Bugs that get mentioned on wiki's but never reported to maintainers
are unlikely to get fixed......
Back in 2.2 days ext3 over md/raid had problems if the raid was
rebuilding, but that was fixed in 2.4.
More recently there was an incompatibility between raid5 and dm-crypt
that could cause corruption, but that has been fixed on both sides
(there are two ways to report errors for a block-device request.
raid5 was setting only one of them and dm-crypt was listening only to
the other - there were "I don't have resources at the moment" errors
for read-ahead requests).
If you have problems with XFS on raid, I suggest you report it to the
XFS and RAID mailing lists - see the MAINTAINERS file for both.
NeilBrown
next prev parent reply other threads:[~2007-03-05 23:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-05 22:55 no journaling and loops on softraid? Dexter Filmore
2007-03-05 23:32 ` Neil Brown [this message]
2007-03-07 16:49 ` Bill Davidsen
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