From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="us-ascii" From: Adrian Head Subject: Re: [linux-lvm] summary of what I need to do to mount snapshot on XFS References: <1010503449.28039.5.camel@cali.nesnahhouse.com> <20020109130259.GC744@tykepenguin.com> <1010606990.15375.22.camel@jeremy-linux.intranet.qualys.com> In-Reply-To: <1010606990.15375.22.camel@jeremy-linux.intranet.qualys.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-Id: Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: Date: Wed Jan 9 17:39:01 2002 List-Id: To: linux-lvm@sistina.com, Jeremy Hansen If this works for you - good. I have had heaps of issues that I have been working with various developers and trying to get fixed. Basically if I used the SGI 2.4.17-xfs kernel with lvm-1.0.1rc4(ish) some file systems would work but others would fail. Some would fail on snapshot creation, others would fail on snapshot mount and others would fail when the snapshot overflowed. When I upgraded LVM to lvm-1.0.1 other filesystems issues were fixed but others broke again. Check out the "Unable to get XFS, ext3, reiserfs & LVM to coexist happily" http://marc.theaimsgroup.com/?l=linux-lvm&m=100994364215110&w=2 thread on linux-lvm / linux-xfs mail archives and see if any of this relates to your problem. With 2.4.17-xfs + lvm-1.0.1 upgrade patch + VFS-lock patch ext2/3 & resierfs will operate correctly but XFS will fail at snapshot creation. You can do a little source code change and get a XFS snapshot created and mounted; but then it will fail on an overfull snapshot. These problems are being worked on by myself and the great SGI XFS developers. The lvm.c change you talk about I assume is the LVM_VFS_ENHANCEMENT change? For some reason when adding the lvm-1.0.1 upgrade patch this disappears from lvm.c I have been able to get this to compile with the change but I have forgoten what I did. This is one question I would like answered by the LVM gurus: should #define LVM_VFS_ENHANCEMENT still be there after upgrading to lvm-1.0.1? What does LVM_VFS_ENHANCEMENT actually do w.r.t lvm-1.0.1rc4(ish) and lvm-1.0.1? I know that LVM_VFS_ENHANCEMENT in older LVM versions was the locking of the VFS so that snapshots would be consistant - is this still correct and is it still needed? For the "large discussion" you are talking about the "Unable to get XFS, ext3, reiserfs & LVM to coexist happily" thread - hit me off list and I will attempt to summarise it for you. On Thu, 10 Jan 2002 06:09, Jeremy Hansen wrote: > My issue wasn't so much with how to create the snapshot but how to > simultaneously mount the snapshot with the live filesystem. I saw a big > thread about having to uncomment from lvm.c, did that but then got > unresolved symbols... > > It seemed as if there were some issues and a large discussion related to > doing this with XFS. > > Thanks > -jeremy -- Adrian Head (Public Key available on request.)