[Pacemaker] LVM Setup

[Florian Haas]

On Wed, Jan 25, 2012 at 6:49 PM, Gregg Stock <gregg at damagecontrolusa.com> wrote:
> Hi,
> I'm trying to setup a 5 node cluster, the same topology as described in
> Roll Your Own Cloud: Enterprise Virtualization with KVM, DRBD, iSCSI and
> Pacemaker
> http://blip.tv/linuxconfau/roll-your-own-cloud-enterprise-virtualization-with-kvm-drbd-iscsi-and-pacemaker-4738148
>
> I'm stuck creating the pacemaker LVM resource. I'm not sure if pacemaker
> doesn't see the volume group or something else is wrong.
>
> Here is the basic setup on CentOS 5.7:
> 1. Six disks setup with a raid 0 array.
> 2. The raid device md0 is a physical volume with a volume group vg_cluster
> and logical volume lv_iscsi0 on top.
> 3. A DRDB resource r0 that uses the logical volume lv_iscsi0 as the disk -
> the device is /dev/drbd1
> 4. A physical volume that uses /dev/drbd1
> 5. A volume group iscsivg0 that uses /dev/drbd1
>
> All of this seems to work fine but when I try and create a the LVM primitive
> with iscsivg0, it is not able to start.
>
> I've tried different filtering schemes in the lvm.conf file but no luck. I'm
> not sure if pacemaker is not able to see the volume group or there is some
> fundamental problem with what I'm trying to do.

Please pastebin your lvm.conf and an screendump of "vgscan -vvv",
taken on a node where DRBD is primary.

Thanks,
Florian

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