It seems to me that for some reason it's not possible to create a
physical volume on a DRBD device. Below, we can see that running
"pvcreate" succeeds and than fails, then it succeeds again etc.:
# pvcreate -d -v /dev/drbd0
Set up physical volume for "/dev/drbd0" with 976544952 available
sectors
Zeroing start of device /dev/drbd0
Physical volume "/dev/drbd0" successfully created
# pvcreate -d -v /dev/drbd0
Wiping cache of LVM-capable devices
Set up physical volume for "/dev/drbd0" with 976544952 available
sectors
Zeroing start of device /dev/drbd0
Failed to write physical volume "/dev/drbd0"
# pvcreate -d -v /dev/drbd0
Set up physical volume for "/dev/drbd0" with 976544952 available
sectors
Zeroing start of device /dev/drbd0
Physical volume "/dev/drbd0" successfully created
Running vgcreate fails:
# vgcreate san2_data /dev/drbd0
No physical volume label read from /dev/drbd0
/dev/drbd0 not identified as an existing physical volume
Unable to add physical volume '/dev/drbd0' to volume group 'san2_data'.
This is the setup used:
encrypted /dev/sdb -> unencrypted /dev/mapper/san2_crypt -> partition
/dev/mapper/san2_crypt1 -> /dev/drbd0
I can create physical volume on /dev/mapper/san2_crypt2 (no DRBD) just fine.
The machine is running Debian Etch on a 2.6.23.12 kernel.
# lvm version
LVM version: 2.02.07 (2006-07-17)
Library version: 1.02.08 (2006-07-17)
Driver version: 4.11.0
I found a similar post, where DRBD wasn't used:
http://linux.derkeiler.com/Mailing-Lists/Ubuntu/2006-11/msg00414.html
Any clues why this happens?
--
Tomasz Chmielewski
http://wpkg.org
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