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[linux-lvm] Mounting a read only disk

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)
Tfo: 868887590
Fax: 868888337

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