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From: David Greaves <david@dgreaves.com>
To: Neil Brown <neilb@suse.de>
Cc: aristizb@ualberta.ca, linux-raid@vger.kernel.org
Subject: Re: RAID1 write order fidelity
Date: Fri, 01 Aug 2008 11:08:30 +0100	[thread overview]
Message-ID: <4892E09E.3030003@dgreaves.com> (raw)
In-Reply-To: <18578.22600.936623.203944@notabene.brown>

Neil Brown wrote:
>> Hence messages like:
>> Filesystem "md0": Disabling barriers, not supported by the underlying device
> 
> A strange message to get as md/RAID1 *does* support barriers when all the
> underlying devices do (since the mid-teens of 2.6 I think).

You specifically mention raid1 - which, granted, is what the OP asked about - is
md raid1 different from other raid levels wrt barriers?

Also the above message comes from XFS on a raid5 on 2.6.18 - Xen :(
I thought I'd seen this on raid5 on 2.6.2[456] too though (no access to check
right now)

David

  reply	other threads:[~2008-08-01 10:08 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-31 15:03 RAID1 write order fidelity aristizb
2008-07-31 16:49 ` David Greaves
2008-08-01  0:26   ` Neil Brown
2008-08-01 10:08     ` David Greaves [this message]
2008-08-01 11:15       ` Holger Kiehl
2008-07-31 18:20 ` David Lethe

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