[Ocfs2-users] OCFS2 mount problem at Linux reboot when device names are non persistent.

[Randy Ramsdell]

Sunil Mushran wrote:
> While mount-by-uuid will work, mount-by-label should also work.
> The one gotcha in the latter is that it expects the device to be
> partitioned. As in, it will not mount-by-label if the device is /dev/sda
> but will if the device is /dev/sda1 or sda2, etc.
>
Agreed, but UUID is completely unique whereas label is not. To avoid
ever mounting the incorrect volume we use UUID. Also note that Suse will
not "mount on boot" any device not partitioned because Suse uses
"hotplug", which doesn't understand unpartitioned devices. Redhat uses
_netdev_, which will mount unpartitioned devices on boot.

> Randy Ramsdell wrote:
>> Ricardo Fernandez wrote:
>>  
>>> Hi,
>>>  
>>> I have the following problem when the servers accessing OCFS2
>>> reboot: as the Linux device names are non persistent, at reboot they
>>> usually change, and then OCFS2 can't mount the device because it is
>>> expecting a different device name as stated in the fstab file. (it
>>> is specified in the format /dev/sdx as the instructions of the OCFS2
>>> installation manual say) If I change the device name to the "new"
>>> name, it works fine. But this is not an acceptable solution, as each
>>> node should be able to start in a fully automatic way. (without
>>> human intervention)
>>>  
>>> I thought that the purpose of the disk LABEL that I added when
>>> formatting the partition with OCFS2 was exactly this. (Am I right?)
>>> I changed the fstab to use the LABEL option, and also try to mount
>>> it from the command line using the LABEL option but it didn't work.
>>> Is there any bug or known issue on this topic. I guess that if I
>>> glue the device name with udev it will work, but I really would
>>> expect OCF2 to solve this problem (because it is not a new one, and
>>> most of the file systems I know can handle it)
>>>  
>>> I would appreciate any help on this topic.
>>>  
>>>  
>>> Thanks a lot
>>> Ricardo
>>>  
>>> I work with:  
>>> RHEL 4
>>> Local SCSI devices
>>> External devices locates in an EVA8000 SAN, accessed through a fibre
>>> channel bus. The OCFS2 file system is on one of these.
>>>  
>>>
>>> _______________________________________________
>>> Ocfs2-users mailing list
>>> Ocfs2-users at oss.oracle.com
>>> http://oss.oracle.com/mailman/listinfo/ocfs2-users
>>>       
>> Do not use label use UUID name and _netdev_ fstab option.
>> This is the UUID of a volume we have.
>> /dev/disk/by-uuid/be12775a-ec1c-4ed7-a06b-f30a081a0603
>>
>> UUID's are unique and never change so they are ideal for what you are
>> describing.
>>
>> Randy Ramsdell
>>
>> _______________________________________________
>> Ocfs2-users mailing list
>> Ocfs2-users at oss.oracle.com
>> http://oss.oracle.com/mailman/listinfo/ocfs2-users
>>   
>