Ok thanks for the advice. But since the kernel client is not compatible
with format 2 images, I can't use it.
I will look at LVM about PV in read-only. Thanks again.
Le mardi 16 avril 2013 à 06:38 +0200, Wolfgang Hennerbichler a écrit :
I am not entirely sure about LVM, but snapshots are read-only by nature.
Maybe LVM expects a writeable PV.
Use format 2 images and create snapshot childs, and all should be good.
On 04/15/2013 04:48 PM, Olivier Bonvalet wrote:
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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DI (FH) Wolfgang Hennerbichler
Software Development
Unit Advanced Computing Technologies
RISC Software GmbH
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