[Linux-cluster] Using LABEL in "Device Special File" as a resource

[Tarun Reddy]

Just FYI... changing cluster.xml by hand works. redhat-config-cluster  
is simply not allowing the device in it's rules checking. That would  
be nice to change the code that checks this. I guess I'll file a  
bugzilla report for it.

And as long as you don't change that device entry, (anything on it),  
the rest of redhat-config-cluster works. Also in cluster.xml, use  
LABEL=<mountpoint> with no quotes. I assume if you have a space  
(IMHO, a bad practice), you could escape it with a \.

Thanks for everyone's input.
Tarun

On Mar 26, 2006, at 6:11 PM, Celso K. Webber wrote:

> Hello Tarun,
>
> I had to solve this problem once under RHEL AS v2.1 (first version  
> of Cluster
> Manager), and it worked perfectly. By that time my problem was that  
> the
> machines had different internal disk configurations, so they had  
> differente
> "/dev/sdXX" names.
>
> Under Cluster Suite v3 I solved this problem by pointing the real  
> devices to
> raw devices, and /dev/raw/XXX after that. I don't know if this has
> implications on performance, but the systems worked apparently well.
>
> I had once some problems with iSCSI on a IBM Blade Center where the  
> iSCSI
> volumes changed their /dev/XXX if the machine booted with the USB  
> floppy/cdrom
> connected (iSCSI dev was /dev/sdb with no USB floppy, but it was  
> recognized as
> /dev/sdc if the USB floppy was connected when the machine booted).
> Fortunately, it was a regular filesystem (no cluster) and I could use
> LABEL=XXX entries in /etc/fstab.
>
> By this time I cannot figure out how could you solve your problem.  
> I imagine
> that it should not be difficult to write a Perl or Shell script  
> that ran just
> before the clumanager started, and issuing commands such as "iscsi- 
> ls" it
> could map a corresponding raw device, or even changing your /etc/ 
> cluster.xml
> on the fly and writing it to the quorum using a "cludb" command.
>
> Sorry for not pointing out a better solution, ok?
>
> Regards,
>
> Celso.
>
> On Sun, 26 Mar 2006 18:02:46 -0700, Tarun Reddy wrote
>> Hmmm....
>>
>> I guess I never tried to edit cluster.xml by hand. On my system at
>> least, redhat-config-cluster does not allow the value. I'll try
>> editing cluster.xml tomorrow and see if that works. Could  you let
>> me  know if you can get redhat-config-cluster to accept the LABEL
>> designation? Could it possibly be that my LABEL is "/www" (no  
>> quotes)?
>>
>> Thanks,
>> Tarun
>>
>> On Mar 24, 2006, at 10:01 AM, Lon Hohberger wrote:
>>
>>> On Thu, 2006-03-23 at 14:50 -0700, Tarun Reddy wrote:
>>>> -----BEGIN PGP SIGNED MESSAGE-----
>>>> Hash: SHA1
>>>>
>>>> Under RHEL3 clustering, I'm trying to mount a partition using the
>>>> LABEL since iscsi bindings have a tendency to switch around.
>>>>
>>>> Using Google to search the archives, I found this message:
>>>> http://www.redhat.com/archives/linux-cluster/2005-October/
>>>> msg00129.html
>>>>
>>>> but this doesn't seem to work with Redhat Clustering on RHEL3. Is
>>>> there another way of doing this?
>>>
>>> It really should work; it works on my RHEL3 system:
>>>
>>> [root at magenta root]# e2label /dev/sdd3
>>>
>>> [root at magenta root]# e2label /dev/sdd3 futon
>>> [root at magenta root]# e2label /dev/sdd3
>>> futon
>>> [root at magenta root]# vi /etc/cluster.xml
>>> ...
>>>     <service checkinterval="10" id="0" name="foo">
>>>       <device id="0" name="LABEL=futon" sharename="">
>>>                <!--   ^- name used to be /dev/sdd3 -->
>>>         <mount forceunmount="yes" fstype="ext3" mountpoint="/mnt/1"
>>> options=""/>
>>>       </device>
>>>       ...
>>>     </service>
>>> ...
>>>
>>> Starting the service and running the mount command yielded this  
>>> on my
>>> machine:
>>>
>>> [root at magenta root]# mount
>>> ...
>>> /dev/sdd3 on /mnt/1 type ext3 (rw)
>>> ...
>>>
>>> Stopping the service causes the mount to go away correctly on my
>>> system.
>>> The label->device resolution has not changed since before the
>>> release of
>>> RHCS3, so there must be something missing that we don't know about.
>>> Note that "LABEL" is case-sensitive, and must be all capital  
>>> letters,
>>> and that no spaces are allowed.
>>>
>>> -- Lon
>>>
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>>> Linux-cluster mailing list
>>> Linux-cluster at redhat.com
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>>
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>
>
> --
> Celso K. Webber <celso at webbertek.com.br>
> (41) 3284-3035
> (41) 8813-1919
>
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