hola Angel,
you need to present your snapshot as a RW LUN ; otherwise you won't be able to activate the VG.
As you should be writing your metadata to the snapshot the original data will remain unharmed.you need to present your snapshot as a RW LUN ; otherwise you won't be able to activate the VG.
Fran
On Tue, Jan 28, 2014 at 1:34 PM, Angel L. Mateo <amateo@um.es> wrote:
Hello guys,
I'm having a problem I don't know how to solve.
I have a running system with its disk under LVM2. Physical disks are in a SAN and we have no problems with them. Now we have configured an automated snapshots of our disks from our SAN to another one (both are HP 3par) and we want now the snapshot to be mounted in another system. This system has connected the snapshot disk without any problem but we can't mount the FS, because we can't activate volumes in it. The "only" difference between original disks and snaptshot ones are that this are seen by the OS as read only disks, so they can't be written.
In the system trying to mount the snapshot I could see PVs, VGs and LVs, as:
amateo_adm@myotis52fa:~$ sudo pvs
PV VG Fmt Attr PSize PFree
/dev/sda5 Disk1 lvm2 a- 6.76g 0
/dev/sdb IndexesDisk lvm2 a- 69.98g 20.00g
/dev/sdc UsersDisk lvm2 a- 2.50t 0
/dev/sdd UsersDisk lvm2 a- 1023.98g 499.97g
amateo_adm@myotis52fa:~$ sudo vgs
VG #PV #LV #SN Attr VSize VFree
Disk1 1 2 0 wz--n- 6.76g 0
IndexesDisk 1 1 0 wz--n- 69.98g 20.00g
UsersDisk 2 1 0 wz--n- 3.50t 499.97g
amateo_adm@myotis52fa:~$ sudo lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
root Disk1 -wi-ao 5.82g
swap_1 Disk1 -wi-ao 956.00m
vol_indexes IndexesDisk -wi-d- 49.98g
vol_users UsersDisk -wi-d- 3.01t
but I can't activate LVs:
amateo_adm@myotis52fa:~$ sudo lvchange -a y UsersDisk/vol_users
device-mapper: reload ioctl failed: Invalid argument
and in the logs I get:
Jan 28 13:32:41 myotis52fa kernel: [ 1789.845945] device-mapper: table: 252:0: linear: dm-linear: Device lookup failed
Jan 28 13:32:41 myotis52fa kernel: [ 1789.846047] device-mapper: ioctl: error adding target to table
the original system and the one trying to mount the snapshot are both ubuntu 12.04 with same kernel (3.4.0-030400-generic) and version of lvm2 (2.02.66-4ubuntu7.4, the packaged by ubuntu).
Any help?
--
Angel L. Mateo Martínez
Sección de Telemática
Área de Tecnologías de la Información
y las Comunicaciones Aplicadas (ATICA)
http://www.um.es/atica
Tfo: 868887590
Fax: 868888337
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