[Ocfs2-users] renaming a OCFS2 cluster

[Tao Ma]

Hi Werner,

Werner Flamme wrote:
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> Hi everyone,
> 
> another problem I did not find a solution for...
> 
> I ran "o2cb configure" and configured a cluster named "ocfs2". Lazy me,
> I did not invent a new name.
> 
> Now this cluster must be renamed to avoid confusion, the name has to
> change to "sapcluster".
> 
> I changed /etc/ocfs2/cluster.conf to the new name and ran "o2cb
> configure" again, but to no avail:
> - ---snip---
> # rco2cb configure
> 
> 
> Configuring the O2CB driver.
> 
> 
> 
> This will configure the on-boot properties of the O2CB driver.
> The following questions will determine whether the driver is loaded on
> boot.  The current values will be shown in brackets ('[]').  Hitting
> <ENTER> without typing an answer will keep that current value.  Ctrl-C
> will abort.
> 
> Load O2CB driver on boot (y/n) [y]:
> Cluster to start on boot (Enter "none" to clear) [sapcluster]:
> Writing O2CB configuration: OK
> Mounting configfs filesystem at /config: OK
> Loading module "ocfs2_dlm": OK
> Loading module "ocfs2_dlmfs": OK
> Mounting ocfs2_dlmfs filesystem at /dlm: OK
> Starting cluster sapcluster: Failed
> o2cb_ctl: Memory allocation failed while setting cluster name
> Stopping cluster sapcluster: OK
> - ---pins---
> 
> I can mount the volume, but in /config/cluster, I still see only the old
> cluster "ocfs2", though /etc/ocfs2/cluster.conf and
> /etc/sysconfig/cluster both contain the cluster name "sapcluster" (on
> all nodes, but it is currently mounted on only one node).
Before you change a cluster name, you missed one important step, you 
need to offline the cluster. So the right steps is:
1. /etc/init.d/o2cb offline
2. change /etc/ocfs2/cluster.conf
3. run /etc/init.d/o2cb configure and change the name.

Now, since you have already changed the configuration file(step 2 and 
3), there are 2 different ways to get the right cluster up. One is 
"umount the ocfs2 volume and reboot the box.", this is simple.
The other is that you can just renamed the cluster name(in cluster.conf 
and o2cb configure) back to the name in your /config/cluster and then do 
the steps I described above(1,2,3).

Good luck.

Regards,
Tao
> 
> BTW, I cannot modify cluster.conf by ocfs2console though I start it as
> root, but I have no problems modifying this file via any editor. I'm
> running SLES9-SP4 on the boxes, btw., and have the following packages
> installed:
> ocfs2-tools-1.2.1-4.2
> ocfs2console-1.2.1-4.2
> 
> Will it help to download and install the newest OCFS2 packages from the
> website?
> 
> Regards,
> Werner
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