[dm-devel] Shared snapshots test
Mikhail Klepachevskyy
mikhailk1 at open-e.com
Wed Mar 10 12:37:13 UTC 2010
Hello!
I tried to test multisnapshots but unfortunately got some errors.
Here is what I did:
1) Build vanilla linux-2.6.33 kernel using Ubuntu Desktop 9.10
config-2.6.31-19-generic config file with
CONFIG_DM_MULTISNAPSHOT=m
CONFIG_DM_MULTISNAPSHOT_MIKULAS=m
CONFIG_DM_MULTISNAPSHOT_DANIEL=m
lines added and with patches from http://people.redhat.com/mpatocka/patches/kernel/new-snapshots/r16/
imposed.
2) reboot with new kernel
3) # modprobe dm-store-mikulas
# modprobe dm-multisnapshot
# pvcreate /dev/sdb
# vgcreate vg1 /dev/sdb
# lvcreate --size=500M --name=lv1 vg1
# lvcreate --size=500M --name=lv2 vg1
# dd if=/dev/zero of=/dev/mapper/vg1-lv2 bs=4096 count=1
# echo 0 `blockdev --getsize /dev/mapper/vg1-lv1` multisnapshot \
/dev/mapper/vg1-lv1 /dev/mapper/vg1-lv2 16 0 mikulas 0\
| dmsetup create ms
# dmsetup message /dev/mapper/ms 0 create
# echo 0 `blockdev --getsize /dev/mapper/vg1-lv1` multisnap-snap \
/dev/mapper/vg1-lv1 0 | dmsetup create ms0
At this point I got the next error:
device-mapper: reload ioctl failed: No such file or directory
Command failed
And these lines appeared in dmesg:
[ 6876.506623] device-mapper: table: 252:3: multisnap-snap: Snapshot with this id doesn't exist
[ 6876.506629] device-mapper: ioctl: error adding target to table
Could you check all the steps I performed right and what could cause
those error messages?
--
Best wishes,
Mikhail Klepachevskyy
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