[linux-lvm] Unable to mount snapshot

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Hi, John,

You should use "-onouuid,ro" as parameter for mount snapshot volume.


John Craig wrote:

> Hi,
>
> I successfully created a snapshot of an active LV with XFS filesystem, 
> and ldisplay shows it to be operating correctly. However, when I try 
> to mount the snapshot, it says "wrong fs type, bad option, bad 
> superblock on /dev/system/snap or too many mounted file systems"
>
> Can anyone help, or shed some light on why this is happening? Is there 
> a workaround?
>
> The mount command was "mount -t xfs -o ro /dev/system/snap /mnt/snap"
>
> I am running SuSE 9.0 on x86-64, with kernel 2.4.21-149, lvm version 
> 1.0.7(mp-v6). I have a volume group running on 3 raid arrays, each 0.9 
> TB, for a total of 2.7 TB. It has 2 active LVs, one of them 2 TB, and 
> the other 500GB, leaving about 249GB unallocated. I created the 
> snapshot with:
>
> lvcreate -L 200G -s -n snap /dev/system/adsdata
>
> As I said, the snapshot seems to be working correctly, but when I 
> bring up the LVM tool in YAST, it shows the original LV, with capacity 
> 1.9 TB, mounted, and the snapshot  with a capacity of 1.9TB, 
> unmounted. When I try to set the mount point for the snapshot, it says 
> the capacity is wrong, it needs to be <= 249GB. In other words, it 
> seems to be treating it as if it were a regular LV, not a snapshot..
>
> The listing of lvdisplay is:
> --- Logical volume ---
> LV Name                /dev/system/snap
> VG Name                system
> LV Write Access        read only
> LV snapshot status     active destination for /dev/system/adsdata
> LV Status              available
> LV #                   3
> # open                 0
> LV Size                2 TB
> Current LE             16383
> Allocated LE           16383
> snapshot chunk size    64 KB
> Allocated to snapshot  16.66% [33.29 GB/199.90 GB]
> Allocated to COW-table 100 MB
> Allocation             next free
> Read ahead sectors     1024
> Block device           58:2
>
>
>
>
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
>