From: Jim Meyering <jim-Oxw1nKZkIVjk1uMJSBkQmQ@public.gmane.org>
To: Alan Pevec <apevec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: device-mapper development
<dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Mike Burns <mburns-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
node-devel <node-devel-dEQiMlfYlSzYtjvyW6yDsg@public.gmane.org>
Subject: Re: [ovirt-devel] blockdev --flushbufs required [was: parted issue/question
Date: Thu, 19 Jan 2012 14:00:45 +0100 [thread overview]
Message-ID: <871uqvkfsy.fsf@rho.meyering.net> (raw)
In-Reply-To: <CAGi==UV2RXGzpxtKa4_4JWqdWrMP6_pf_PrdyDMtjMmSQtXgPg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> (Alan Pevec's message of "Wed, 18 Jan 2012 17:22:14 +0100")
Alan Pevec wrote:
>> On Wed, 2012-01-18 at 14:44 +0100, Jim Meyering wrote:
>>> [Following up on this thread:
>>> http://thread.gmane.org/gmane.linux.kernel.device-mapper.devel/14999]
>>> Alasdair G Kergon wrote:
>>> > Try
>>> > blkdev --flushbufs
>>> > after any cmd that writes to a dev to see if that makes any difference.
>>>
>>> Thanks for the work-around.
>>> Using "blockdev --flushbufs $dev" does indeed make parted
>>> behave the same with dm-backed storage as with other devices.
>
> Thanks Jim!
> That reminds me we've already seen something similar and there's still
> workaround with drop_caches in ovirt-config-boot installer:
> # flush to sync DM and blockdev, workaround from rhbz#623846#c14
> echo 3 > /proc/sys/vm/drop_caches
>
> But 623846 was supposed to be fixed in RHEL 6.0 ?
FYI, Niels de Vos has just posted a patch that should fix this:
http://thread.gmane.org/gmane.linux.kernel/1241227
With that, maybe you'll be able to remove that other work-around.
next prev parent reply other threads:[~2012-01-19 13:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4F13ADB3.5070806@redhat.com>
2012-01-17 22:28 ` parted issue/question Jim Meyering
2012-01-18 0:38 ` Alasdair G Kergon
2012-01-18 13:44 ` blockdev --flushbufs required [was: " Jim Meyering
[not found] ` <87haztruph.fsf_-_-CybKA8TIZ99x3y/oJEDuiw@public.gmane.org>
2012-01-18 13:58 ` [ovirt-devel] " Mike Burns
[not found] ` <1326895081.27879.0.camel-GBFV1wXchybjvs0ExVSBjSAqptkPoUJl@public.gmane.org>
2012-01-18 16:22 ` Alan Pevec
[not found] ` <CAGi==UV2RXGzpxtKa4_4JWqdWrMP6_pf_PrdyDMtjMmSQtXgPg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-01-19 13:00 ` Jim Meyering [this message]
2012-01-18 14:05 ` Zdenek Kabelac
2012-01-18 14:14 ` Alasdair G Kergon
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