[Ocfs2-users] Question about increasing node slots

[Tim Lank]

So since tunefs.ocfs2 is the tool that actually does all of the work to
add more slots and the tunefs.ocfs2 man page states:

DESCRIPTION
      tunefs.ocfs2  is  used to adjust OCFS2 file system parameters on disk.
      In order to prevent data  loss,  tunefs.ocfs2  will  not  perform  any
      action  on  the  specified  device if it is mounted on any node in the
      cluster.  This tool requires the O2CB cluster to be online.

I return to my original question:
"Is it true that we will need to umount these filesystems for the upgrade
(i.e. Database and Clusterware also)?"

Since our cluster is running entirely on ocfs2 filesystems, this will
cause a cluster outage.

Is there a way to do this while the filesystems are mounted?  If not, are
there plans for allowing a node count increase while the fileystems are
mounted, and if so, when?


> The console does that (You can use the console to add a new node).
> tunefs.ocfs2 is actually the tool that will change the superblock to add
> more slots (see the man pages) and it is called by the console (a more
> user friendly interface) to perform the action.
>
> o2cb_ctl only defines the new node(s) on the existing nodes that are
> running.
>
> Regards,
>
> Marcos Eduardo Matsunaga
>
> Oracle USA
> Linux Engineering
>
>
>
>
>
> Tim Lank wrote:
>> So does the o2cb_ctl command touch the ocfs2 filesystem superblock and
>> increase the node slot value in this example?
>>
>>
>>
>>>> From
>>>> http://oss.oracle.com/projects/ocfs2/dist/documentation/ocfs2_faq.html
>>>>
>>> 19 - How do I add a new node to an online cluster?
>>> You can use the console to add a new node. However, you will need to
>>> explicitly add the new node on all the online nodes. That is, adding on
>>> one node and propagating to the other nodes is not sufficient. If the
>>> operation fails, it will most likely be due to bug#741
>>> <http://oss.oracle.com/bugzilla/show_bug.cgi?id=741>. In that case, you
>>> can use the o2cb_ctl utility on all online nodes as follows:
>>>
>>> 	# o2cb_ctl -C -i -n NODENAME -t node -a number=NODENUM -a
>>> ip_address=IPADDR -a ip_port=IPPORT -a cluster=CLUSTERNAME
>>>
>>> Ensure the node is added both in /etc/ocfs2/cluster.conf and in
>>> /config/cluster/CLUSTERNAME/node on all online nodes. You can then
>>> simply copy the cluster.conf to the new (still offline) node as well as
>>> other offline nodes. At the end, ensure that cluster.conf is consistent
>>> on all the nodes.
>>>
>>> 20 - How do I add a new node to an offline cluster?
>>>
>>> You can either use the console or use o2cb_ctl or simply hand edit
>>> cluster.conf. Then either use the console to propagate it to all nodes
>>> or hand copy using scp or any other tool. The o2cb_ctl command to do
>>> the
>>> same is:
>>>
>>>         # o2cb_ctl -C -n NODENAME -t node -a number=NODENUM -a
>>> ip_address=IPADDR -a ip_port=IPPORT -a cluster=CLUSTERNAME
>>>
>>> Notice the "-i" argument is not required as the cluster is not online.
>>>
>>>
>>> Regards,
>>>
>>> Marcos Eduardo Matsunaga
>>>
>>> Oracle USA
>>> Linux Engineering
>>>
>>>
>>>
>>>
>>>
>>> Tim Lank wrote:
>>>
>>>> We have a test 10gR2 RAC cluster using ocfs2 filesystems for the
>>>> Clusterware files and the Database files.
>>>>
>>>> We need to increase the node slots to accomodate new RAC nodes.  Is it
>>>> true that we will need to umount these filesystems for the upgrade
>>>> (i.e.
>>>> Database and Clusterware also)?
>>>>
>>>> We are planning to use the following command format to perform the
>>>> node
>>>> slot increase:
>>>>
>>>> # tunefs.ocfs2 �N 3 /dev/mapper/mpath1p1
>>>>
>>>> _______________________________________________
>>>> Ocfs2-users mailing list
>>>> Ocfs2-users at oss.oracle.com
>>>> http://oss.oracle.com/mailman/listinfo/ocfs2-users
>>>>
>>>>
>>
>>
>