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Re: [dm-devel] Shared snapshots test



Hi,
     I used the patchs for LVM2.02.54, however, when i compiled it, an err came:
    
../lib/liblvm-internal.a(lv_manip.o): In function `lv_extend':
lv_manip.c:(.text+0x629a): undefined reference to `last_seg'

  where is the 'last_seg' 's definition?
  my linux kernel version is 2.6.18.
  thank you!
 
best regards
Bubsy
 
2010/3/10 Mikhail Klepachevskyy <mikhailk1 open-e com>
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?
> >
>
> But rather, you could use userspace support for shared snapshots, it makes
> the use much easier, you can use lvcreate, lvremove, lvresize commands:
>
> for lvm-2.02.54:
> http://people.redhat.com/mpatocka/patches/userspace/new-snapshots/lvm-2.02.54/
> for lvm-2.02.60:
> http://people.redhat.com/mpatocka/patches/userspace/new-snapshots/lvm-2.02.60/
> for lvm-2.02.62:
> http://people.redhat.com/msnitzer/patches/multisnap/lvm2/LVM2-2.02.62/

--
Best wishes,
Mikhail Klepachevskyy


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