Hi,
Something similar is also happening to me on Dapper LTS 6.06.2 with
Kernel 2.6.15-52-amd64-server.
I do not have a way of reproducing this at will.
In summary, I have the primary volume (u01) of 450GB sitting in a VG
using a PV on /dev/cciss_c0d1p1, so no mdraid or other layering.
Creating a 15GB snapshot of of the volume works as expected.
# lvcreate -s -n test1 -L 15G vg01/u01
Logical volume "test1" created
#
I can then mount and use the snapshot.
Creating a second snapshot of the volume then resulted in:
# lvcreate -s -n test2 -L 20G vg01/u01
Logical volume "test2" created
#
However, the volume is not usable:
# lvdisplay vg01
--- Logical volume ---
LV Name /dev/vg01/u01
VG Name vg01
LV UUID Be69s5-zvtC-OKp3-IJDR-MQFe-YWPe-A7Bm1S
LV Write Access read/write
LV snapshot status source of
/dev/vg01/test1 [active]
/dev/vg01/test2 [INACTIVE]
LV Status available
# open 1
LV Size 450.00 GB
Current LE 14400
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 254:3
--- Logical volume ---
LV Name /dev/vg01/test1
VG Name vg01
LV UUID PYhpfX-5Wl3-x487-h4x6-Gb2y-7N1j-x4XB2c
LV Write Access read/write
LV snapshot status active destination for /dev/vg01/u01
LV Status available
# open 1
LV Size 450.00 GB
Current LE 14400
COW-table size 15.00 GB
COW-table LE 480
Allocated to snapshot 0.40%
Snapshot chunk size 8.00 KB
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 254:12
--- Logical volume ---
LV Name /dev/vg01/test2
VG Name vg01
LV UUID HKyqse-NSu3-5b2y-So54-xZsr-oiNK-ndExdP
LV Write Access read/write
LV snapshot status INACTIVE destination for /dev/vg01/u01
LV Status available
# open 0
LV Size 450.00 GB
Current LE 14400
COW-table size 20.00 GB
COW-table LE 640
Snapshot chunk size 8.00 KB
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 254:14
#
And I see these errors in dmesg:
[792276.624583] attempt to access beyond end of device
[792276.624591] dm-13: rw=17, want=569894688, limit=41943040
[792276.624596] device-mapper: Error reading/writing snapshot
[792276.665813] attempt to access beyond end of device
[792276.665819] dm-13: rw=17, want=569902896, limit=41943040
[792276.923219] attempt to access beyond end of device
[792276.923225] dm-13: rw=17, want=569894688, limit=41943040
[792276.965357] attempt to access beyond end of device
[792276.965362] dm-13: rw=17, want=569902896, limit=41943040
[792277.253731] attempt to access beyond end of device
[792277.253737] dm-13: rw=17, want=569894688, limit=41943040
[792277.805186] device-mapper: snapshot is marked invalid
[EMAIL PROTECTED]:~#
It seems that most times when I do the following:
* create snapshot snap1
* use snapshot snap1
*create snapshot snap2
then snap2 is invalid, but if I dont use snap1 then things seem to be
ok.
Regards,
Mike
--
"attempt to access beyond end of device" when creating LVM snapshot
https://bugs.launchpad.net/bugs/84821
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