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Re: Page restriction of dump also applicable to xfsdump?

To: Kai Leibrandt <k_leibrandt@xxxxxxxxxxx>
Subject: Re: Page restriction of dump also applicable to xfsdump?
From: Stephen Lord <lord@xxxxxxx>
Date: 08 Nov 2002 06:04:51 -0600
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <OE52DFuXCpU6q5ijb1u00001bda@hotmail.com>
References: <OE52DFuXCpU6q5ijb1u00001bda@hotmail.com>
Sender: linux-xfs-bounce@xxxxxxxxxxx
On Fri, 2002-11-08 at 05:53, Kai Leibrandt wrote:
> Hi all,
> I was just browsing redhat.com when I struck the following
> http://www.redhat.com/docs/manuals/linux/RHL-8.0-Manual/admin-primer/s1-disa
> ster-backups.html. Basically linux says stay well away from dump when using
> ext2 and ext3 when using any kernels 2.4.x and above. As he says the cause
> of this is that the page and buffer cache are no longer coherent, I am
> wondering if this also applies to xfs filesystems and xfsdump/xfsrestore;
> they use the same caches, right?
> If this _does_ apply to xfs then I guess dump is out the window even on xfs
> filesystems, which would really be a pain as I prefer [xfs]dump over tar or
> cpio by a mile.
> Many thanks for any answers,
> Kai.

xfsdump is designed to work on a live filesystem, it does not the
same mechanisms as dump, but reads file data through system calls
and hence through the cache. So it is coherent with read write.
In fact xfsdump does not work on an unmounted filesystem.


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