From: Chris Mason <chris.mason@oracle.com>
To: Tomasz Chmielewski <mangoo@wpkg.org>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: LVM vs btrfs as a "volume manager" for SANs
Date: Fri, 24 Apr 2009 08:38:38 -0400 [thread overview]
Message-ID: <1240576718.29896.2.camel@think.oraclecorp.com> (raw)
In-Reply-To: <49F0FAEA.2020904@wpkg.org>
On Fri, 2009-04-24 at 01:34 +0200, Tomasz Chmielewski wrote:
> Chris Mason schrieb:
>
> >> However, with btrfs, I'm not sure about:
> >>
> >> - what happens if SAN machine crashes while the iSCSI file images were
> >> being written to; with LVM and its block devices, I'm somehow more
> >> confident it wouldn't make more data loss than necessary
> >
> > If iscsi is writing with O_DIRECT|O_SYNC it should work.
>
> What if it doesn't?
>
Writes would go to the page cache only (not O_DIRECT) and the metadata
wouldn't get flushed with each write (not O_SYNC).
-chris
next prev parent reply other threads:[~2009-04-24 12:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-22 19:20 LVM vs btrfs as a "volume manager" for SANs Tomasz Chmielewski
2009-04-23 0:13 ` Dmitri Nikulin
2009-04-23 18:45 ` Chris Mason
2009-04-23 23:34 ` Tomasz Chmielewski
2009-04-24 12:38 ` Chris Mason [this message]
2009-07-02 15:22 ` Tomasz Chmielewski
2009-07-06 18:51 ` Chris Mason
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