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Re: [linux-lvm] Re: [catch22] lvm vs reiserfs



On Thursday 22 March 2001 23:33, Ed Tomlinson wrote:

Hi,

Looks like the generated lvm patch stomps all over the
VFS locking stuff...  Guess the correct procedure is
-R VFS, patch lvm, patch VFS.  Will test tonight

Ed

> On Thursday 22 March 2001 16:06, Ed Tomlinson wrote:
>
> Chris et all,
>
> Looks like reiserfs snapshots are broken with beta6 and ac22.
> I had to upgrade to beta6 because of other problems (vgextend
> caused vgscan to fail...).  Now the snapshots are dead again.
> Note the VFS patch is still applied...
>
> oscar# lvcreate -L 1G -s -n snap /dev/lv/root /dev/hda3
> lvcreate -- WARNING: the snapshot must be disabled if it gets full
> lvcreate -- INFO: using default snapshot chunk size of 64 KB for
> "/dev/lv/snap" lvcreate -- doing automatic backup of "lv"
> lvcreate -- logical volume "/dev/lv/snap" successfully created
>
> oscar# mount /dev/lv/snap /snap -treiserfs -oro
> reiserfs: checking transaction log (device 3a:04) ...
> clm-2076: device is readonly, unable to replay log
> Replay Failure, unable to mount
> reiserfs_read_super: unable to initialize journal space
> mount: wrong fs type, bad option, bad superblock on /dev/lv/snap,
>        or too many mounted file systems
>
> Ideas?
> Ed
>
> > On Thursday 22 March 2001 15:10, Chris Mason wrote:
> > > On Thursday, March 22, 2001 02:46:31 PM -0500 Ed Tomlinson
> > >
> > > <tomlins cam org> wrote:
> > > > Hi,
> > > >
> > > > I decided to really try out some of the features built into 2.4. 
> > > > Using a 2.4.2-ac20 kernel I my root on /dev/lv/root as a reiserfs
> > > > filesystem. So far so good.  Now I want to back it up.  So I created
> > > > a snapshot with lvcreate -L 50 -s -n snap /dev/lv/root.  This works
> > > > too.  Problem happens when I want to mount /dev/lv/snap to back it up
> > > > logically.  At this point reiserfs wants to replay its journal.... 
> > > > Of course it cannot
> > > > (snapshot=ro).
> > > >
> > > > How can this be resolved?  Is there a way to sync root just after the
> > > > lvm data gets updated in /etc but before the snapshot starts?  How
> > > > else might this be fixed (is it fixed already somewhere)?
> > >
> > > Go to ftp.sistina.com, and grab 0.9.1_beta6.  Apply
> > > linux-2.4.2-VFS-lock.patch that is included in PATCHES directory after
> > > untarring.  This provides the rest of the lockfs API I coded with the
> > > LVM guys.
> >
> > I updated to ac21 with the above patch.  I am using the lvm utilities
> > from:
> >
> > deb ftp://ftp.sistina.com/pub/LVM/0.9/binaries/debian unstable main
> >
> > Now I can mount the snapshot.  Thanks.
> >
> > One loose end, is the journal-1777 message below something to worry
> > about?
> >
> > oscar# lvcreate -L 50 -s -n snap /dev/lv/root
> > lvcreate -- rounding up size to physical extent boundary "52 MB"
> > lvcreate -- WARNING: the snapshot must be disabled if it gets full
> > lvcreate -- INFO: using default snapshot chunk size of 64 KB for
> > "/dev/lv/snap" journal-1777: buffer 16 bad state !PREPARED !LOCKED !DIRTY
> > !JDIRTY_WAIT lvcreate -- doing automatic backup of "lv"
> > lvcreate -- logical volume "/dev/lv/snap" successfully created
> >
> > TIA,
> > Ed Tomlinson
>
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