From: Coywolf Qi Hunt <qiyong@fc-cn.com>
To: Block Device <blockdevice@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: A standard snapshot notification framework in Linux ?
Date: Tue, 15 Nov 2005 16:24:08 +0800 [thread overview]
Message-ID: <20051115082408.GA3249@localhost.localdomain> (raw)
In-Reply-To: <64c763540511142345g4ca0b184y28962dae494f22b4@mail.gmail.com>
On Tue, Nov 15, 2005 at 01:15:54PM +0530, Block Device wrote:
> Hi,
>
> does the linux kernel provide a mechanism whereby applications can
> register themselves
> to be notified when a snapshot is being taken of the volume they might
> be writing to.
>
> If there is no such framework then how do backup applications
> guarantee ( application level ) consistency. I have seen freeze_bdev
call sync and mount read-only, or go down to init 1.
Coywolf
> and friends which work for file systems and how the device mapper uses
> them. But when it comes to application level consistency, a mechanism
> is required to give the application a chance to flush & quiesce its
> writes so that the backup taken will be consistent for the application
> also. Windows has the VSS ( Volume Shadow Service ) which provides an
> elaborate framework for this. Is anyone working on something similar
> for Linux and if not why is it not such a worthwhile idea ?
>
> Regards
> BD
prev parent reply other threads:[~2005-11-15 8:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-15 7:45 A standard snapshot notification framework in Linux ? Block Device
2005-11-15 8:24 ` Coywolf Qi Hunt [this message]
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