[DRBD-user] Unable add volume group to physical volume /dev/drbd0

Lars Ellenberg lars.ellenberg at linbit.com
Mon Feb 9 19:46:36 CET 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On Mon, Feb 09, 2009 at 06:52:34PM +0100, hans morbus2000 wrote:
> Hi there,
> 
> we want use "Nested LVM configuration with DRBD"
> but we canŽt create a VG on top of the PV /dev/drbd0?
> 
> 2.6.16.60-0.27-xen
> drbd 8.2.6
> finally, we want use in primary / primary mode an ocfs2
> 
> 
> OK. step by step
> 
> set an filter in the /etc/lvm/lvm.conf
> filter = ["a|sd.*|", "a|drbd.*|", "r|.*|"]
> 
> we have one partition /dev/sda3, which we use as physical volume on each node.
> 
> # pvcreate /dev/sda3			# initialize partitions as PVs
> Physical volume "/dev/sda3" successfully created
> 
> # pvscan –v				# show physical volume
>     Wiping cache of LVM-capable devices
>     Wiping internal VG cache
>     Walking through all physical volumes
>   PV /dev/sda3         lvm2 [1.36 TB]
> 
> # vgcreate vglocal /dev/sda3		# erstellt die VG und fügt die Partition hinzu
> 					Beispiel: vgcreate local /dev/sda1 /dev/sda2
> Volume group "vglocal" successfully created
> 
> # vgscan				# show VG
>   Reading all physical volumes.  This may take a while...
>   Found volume group "vglocal" using metadata type lvm2
> 
> # lvcreate --name drbd -l 355343 vglocal	# create your LV to be used as DRBD's backing
>   Logical volume "drbd" created
> 
> 
> Now, we configure DRBD and subsequent promote /dev/drbd0 as Primary on one node.
> 
> # pvcreate –d –v /dev/drbd0		# write PV signature
>   Physical volume "/dev/drbd0" successfully created
> 
> # pvscan -v                                                     # show PVŽs
>     Wiping cache of LVM-capable devices
>     Wiping internal VG cache
>     Walking through all physical volumes
>   PV /dev/sda3           VG vglocal   lvm2 [1.36 TB / 0    free]
>   PV /dev/vglocal/drbd                lvm2 [1.36 TB]

bad.
that should have found /dev/drbd0 as a pv, right?
but it did not.

as long as it does not, don't proceed further.

-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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