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[linux-lvm] can't use LVM2 - "Failed to write physical volume"?



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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