[linux-lvm] Unable to mount snapshot
John Craig
johncraig01 at netscape.net
Thu Dec 18 11:36:01 UTC 2003
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
More information about the linux-lvm
mailing list