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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