Hello!
Big thanks! It helped!
On Wed, Mar 10, 2010 at 08:11:11AM -0500, Mikulas Patocka wrote:
>
> You need to suspend and resume the origin device after create message and
> before attaching the snapshot.
>
> > I tried to test multisnapshots but unfortunately got some errors.
> > Here is what I did:
> >
<skip>
> > # 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
>
> dmsetup suspend ms
> dmsetup resume ms
>
> > # 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