RBD snapshots are not «readable», because of LVM ?

[Olivier Bonvalet <ceph.list@xxxxxxxxx>]

Hi,

I'm trying to map a RBD snapshot, which contains an LVM PV.

I can do the «map» : 
    rbd map hdd3copies/jason@20130415-065314 --id alg

Then pvscan works :
    pvscan | grep rbd
      PV /dev/rbd58   VG vg-jason   lvm2 [19,94 GiB / 1,44 GiB free]

But enabling LV doesn't work :
        # vgchange -ay vg-jason
          device-mapper: reload ioctl failed: Argument invalide
          Internal error: Maps lock 13746176 < unlock 13889536
          device-mapper: reload ioctl failed: Argument invalide
          device-mapper: reload ioctl failed: Argument invalide
          device-mapper: reload ioctl failed: Argument invalide
          device-mapper: reload ioctl failed: Argument invalide
          device-mapper: reload ioctl failed: Argument invalide
          device-mapper: reload ioctl failed: Argument invalide
          7 logical volume(s) in volume group "vg-jason" now active

        # blockdev --getsize64 /dev/mapper/vg--jason-*
        0
        0
        0
        0
        0
        0
        0

Is it a problem from LVM, or I should not use snapshots like that ?


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