[dm-devel] how to load dm-multisnapshot [with LVM patch]

[Mike Snitzer]

I'll retest and will share my findings later today (the 2.02.64 patches
on my website were refreshed from 2.02.63+ that was very close to the
final 2.02.64); but I didn't retest them at that time).

But I handed these 2.02.64 patches off to Mikulas and I have to believe
he'd have seen this issue when testing his further development.  To my
knowledge he hasn't.

Anyway, we'll see, but I've seen similar errors when I've created a
shared cow LV using a sandbox lvm2 build (not installed to the system).
And then the system's lvm2 didn't have multisnapshot support.  In that
situation you'll see the same type of unknown segment errors when
running the system's lvm2 commands.

Mike

On Tue, May 25 2010 at 11:52pm -0400,
Busby <chaimvy at gmail.com> wrote:

> Hi,
>      I have debug the lvm2.02.64 (with the shared-snapshot patches).
>      In the last email I mentioned the 'Cannot update volume group vg00 with
> unknown segments in it!'
>      The debug mesg: " vg_has_unknown_segments  function: snapshot0 has
> unknown seg."
>       I don't know when the snapshot0 has been created?why its segtype
> unkown?
>      Hope for your help.
>      Thank you.
> 
> 
> Best regards,
> Busby
> 
> 在 2010年5月24日 下午5:04，Busby <chaimvy at gmail.com>写道：
> 
> > Hi All,
> >
> > I get the patches from:
> > Linux kernel 2.6.34 patch:
> > http://people.redhat.com/mpatocka/patches/kernel/new-snapshots/r19/
> >
> > LVM2-2.02.64 patch:
> > http://people.redhat.com/msnitzer/patches/multisnap/lvm2/LVM2-2.02.64/
> >
> >
> >
> > but when I used it, the segment type can not find, can anyone help me?
> >
> >
> >
> > [root at new-host-34 ~]# pvcreate /dev/sd[bcdef]
> >
> > [root at new-host-34 ~]# vgcreate vg00 /dev/sd[bcdef]
> >
> > [root at new-host-34 ~]# lvcreate -L 100G -n lv_test /dev/vg00
> >
> > [root at new-host-34 ~]# lvcreate -L 200G -c 256 --sharedstore  mikulas -s
> > /dev/vg00/lv_test
> >
> >   *WARNING: Unrecognised segment type multisnapshot*
> >
> > *  Cannot update volume group vg00 with unknown segments in it!*
> >
> > [root at new-host-34 ~]# lvscan
> >
> > ACTIVE         '/dev/vg00/lv_test' [100.00 GiB] inherit
> >
> >   inactive          '/dev/vg00/lv_test-shared' [200.00 GiB] inherit
> >
> > [root at new-host-34 ~]# lvcreate -s -n lv_test_ss1 /dev/vg00/lv_test
> >
> >   *Unable to create new logical volume with no extents*
> >
> >
> >
> >
> >
> > The dm modules in the system:
> >
> >
> >
> > [root at new-host-34 LVM2.2.02.64]# lsmod |grep dm
> > dm_snapshot            25583  0
> > dm_store_daniel        11304  0
> > dm_store_mikulas       43265  0
> > dm_multisnapshot       20276  2 dm_store_daniel,dm_store_mikulas
> > dm_mirror              11564  0
> > dm_multipath           14594  0
> > scsi_dh                 5480  1 dm_multipath
> > dm_region_hash          8233  1 dm_mirror
> > dm_log                  8158  2 dm_mirror,dm_region_hash
> > dm_mod                 58855  9 dm_snapshot,*
> > dm_store_daniel,dm_store_mikulas,dm_multisnapshot*
> > ,dm_mirror,dm_multipath,dm_log
> >
> >
> >
> >
> >
> >         I just want to use the multisnap by LVM2 command. But I don't know
> > is there any document about HOW-TO?
> >
> >         Thank you very much.
> >
> >
> >
> >
> >
> >
> >
> > Best regards,
> >
> > Busby
> >

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