Build and install the xenified kernel. ("hg pull http://xenbits.xensource.com/linux-2.6-xen.hg") I suggest doing this in the Xen domU where it will be used. (The modules will be installed correctly.)
Build and install OCFS2 (http://oss.oracle.com/projects/ocfs2/files/source/v1.1).
Build and install OCFS2-tools (http://oss.oracle.com/projects/ocfs2-tools/dist/files/source/v1.1/ocfs2-tools-1.1.5.tar.gz).
Edit /etc/default/o2cb:
O2CB_ENABLED=true O2CB_BOOTCLUSTER=eng00
Edit /etc/ocfs2/cluster.conf:
node:
ip_port = 7777
ip_address = 169.236.8.35
number = 0
name = engcluster0004
cluster = eng00
node:
ip_port = 7777
ip_address = 169.236.8.36
number = 1
name = engcluster0005
cluster = eng00
cluster:
node_count = 2
name = eng00
Start the domU with access to the shared device (disk.append(phy:/dev/etherd/e0.0p6,/dev/sdc1,w!)).
Not the use of the exclamation point (!).
Xen will disallow mounting the same device in multiple guests without this.
Create an OCFS2 partition:
mkfs.ocfs2 /dev/sdc1
Start the cluster:
/usr/src/ocfs2-tools-1.1.5/vendor/common/o2cb.init start
Mount the partition:
mount /dev/sdc1 /mnt/shared
You should be able to run the last two steps on another guest domain. Both will now be able to interact with the filesystem.
To automate startup, first copy the init files to /etc/init.d:
cp /usr/src/ocfs2-tools-1.1.5/vendor/common/o2cb.init /etc/init.d/o2cb cp /usr/src/ocfs2-tools-1.1.5/vendor/common/ocfs2.init /etc/init.d/ocfs2
Debian's ocfs2-tools (0.99.12-1) is too old to use but it will make the /etc/rc?.d entries for o2cb. It does not make the ocfs2 entries. I use these:
lrwxrwxrwx 1 root root 14 Dec 26 19:44 /etc/rc0.d/K20o2cb -> ../init.d/o2cb lrwxrwxrwx 1 root root 14 Dec 26 19:44 /etc/rc1.d/K20o2cb -> ../init.d/o2cb lrwxrwxrwx 1 root root 14 Dec 26 19:44 /etc/rc2.d/S20o2cb -> ../init.d/o2cb lrwxrwxrwx 1 root root 15 Dec 26 19:59 /etc/rc2.d/S40ocfs2 -> ../init.d/ocfs2 lrwxrwxrwx 1 root root 14 Dec 26 19:44 /etc/rc3.d/S20o2cb -> ../init.d/o2cb lrwxrwxrwx 1 root root 15 Dec 26 19:59 /etc/rc3.d/S40ocfs2 -> ../init.d/ocfs2 lrwxrwxrwx 1 root root 14 Dec 26 19:44 /etc/rc4.d/S20o2cb -> ../init.d/o2cb lrwxrwxrwx 1 root root 15 Dec 26 20:00 /etc/rc4.d/S40ocfs2 -> ../init.d/ocfs2 lrwxrwxrwx 1 root root 14 Dec 26 19:44 /etc/rc5.d/S20o2cb -> ../init.d/o2cb lrwxrwxrwx 1 root root 15 Dec 26 20:00 /etc/rc5.d/S40ocfs2 -> ../init.d/ocfs2 lrwxrwxrwx 1 root root 14 Dec 26 19:44 /etc/rc6.d/K20o2cb -> ../init.d/o2cb