Resolving LVM: Unrecognised LVM device type 259

March 20th, 2010

Trying to create a md raid1 device for 2 phyiscal 1TB disks failed unexpectedly with a strange (and very undescriptive error, that is only revealed when running with the verbose option (-vvv):

Wiping internal VG cache
/dev/md0p2: Skipping: Unrecognised LVM device type 259
Device /dev/md0p2 not found (or ignored by filtering).

The problem seems to be that the type 259 is simply not recognized, although it is defined in /proc/devices and known as blkext there.
So adding this to /etc/lvm/lvm.conf in the devices section:

types = [ "blkext", 64 ]

After adding this the mdadm command to create the md device succeeds:

mdadm --create /dev/md0 --level=1 --raid-disks=2 /dev/sda /dev/sdb

2 Responses to “Resolving LVM: Unrecognised LVM device type 259”

  1. Nathanon 08 Jun 2010 at 21:56

    And what about when it says “Skipping: Unrecognised LVM device type 8”? :(

  2. Randomon 17 Jun 2010 at 22:36

    Just check what device type 8 refers too (do a cat /proc/devices for that).
    And then also add that reference to the /etc/lvm/lvm.conf file in the devices section.

    If your are unsure, post the output of mdadm –examine –scan -vvv and cat /proc/devices