[Linux-HA] OCFS2 and Heartbeat2

[Robert Wipfel]

>>> On Thu, Aug 10, 2006 at  7:36 AM, in message
<200608101536.24872.mdmlha at designassembly.de>, Matthias Dahl
<mdmlha at designassembly.de> wrote: 
> Hello everyone.

[...]

> To make a long story short: OCFS2 self fencing mechanism gave me
headaches 
> in 
> a two node "cluster" because if one node fails, the other node
immediately 
> self fences... which is not what we are looking for. As I understand
the 
> newest Heartbeat2 release and several (older) posts to the list, it
is 
> possible to use Heartbeat2 as a replacement for the heartbeat
mechanism of 
> OCFS2 and thus aviod the self fencing "problem" we have ran into.
This way, 
> even a two node setup should work fine.
> 
> Unfortunately, I haven't been able to find any documentation on how
this has 
> 
> been implemented in Heartbeat2 and on how I have to configure
Heartbeat2 for 
> 
> this.
> 
> I appreciate any help or hints I can get.

Configure OCFS2 using ocfs2console - make it match your Linux-ha nodes
and network interfaces.

Setup OCFS2 for user space heartbeats - /etc/init.d/o2cb configure -
enter y for "Use user-space driven heartbeat?"

mkfs.ocfs2 -N <number of cluster nodes> /dev/whatever

The cluster stack doesn't need to be running in order to do this.
/dev/whatever is your shared storage - e.g. iSCSI, FC, SAS etc.

Create a clone cluster resource using Heartbeat's OCF Filesystem
resource agent. 

Specify the device, mount point and ocfs2 as your filesystem type. E.g.
use the attach CIB XML fragment like this: cibadmin -C -o resources -x
./ocfs2cloneset.xml

Hth,
Robert

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