[Linux-cluster] lv and its snapshot can be mounted at the same timein one node?

[Jonathan E Brassow]

Have you tried this with GFS using one machine an lock_nolock?

I'm guessing that since the superblock is going to contain the same 
information in the lv and its snapshot, there might be a problem...  I 
think that lock_nolock might get around this.

I guess you could have your lv mounted cluster-wide, then mount the 
snapshot on one machine with lock_nolock and do the backup...

have you tried this?

  brassow

On Oct 22, 2004, at 12:52 AM, Rocty Wang wrote:

>
> If I just used lvm2 and ext3, without cluster suite and GFS, I found 
> that
> I can mount the lv and its snapshot at the same time.
>
> I just want the file system supports two features as below, but can't 
> be
> found now.
>
> 					   Extended on mounted
> its snapshot can be mounted at the same time
>
> Ext3						not support
> support
> XFS							support
> not support
> Cluster suite/GFS			support
> ???
>
> Is that Cluster suite/GFS can support feature of the snapshot mounted 
> at the
> same time above?
>
> Thanks.
>
> Operations of ext3 fs just listed below:
>
> #pvcreate /dev/sda /dev/sdb
>
> #vgcreate vg1 /dev/sda /dev/sdb
>
> #lvcreate -L 10G -n lv1 vg1
>
> #mke2fs /dev/vg1/lv1
>
> #mount /dev/vg1/lv1 /home/lv1
>
> #lvcreate -s -L 2G -n snap1 /dev/vg1/lv1
>
> #mount -o ro /dev/vg1/snap1 /home/snap1
> 	*** It is OK! ***
>
>
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