Re: bindings file; rename WWID to mpath alias

["Victoria A Smith" <vasmith@sandia.gov>]

Yes, that is good information.  I am curious to know, however, if
mixing the use of WWIDs and aliases can cause problems.  In other
words, I have a WWID which has an alias, but it is not being seen
by the system:

# dmsetup ls --target multipath
mpath9	(253, 6)
mpath8	(253, 5)
mpath14	(253, 9)
mpath7	(253, 4)
mpath13	(253, 8)
350002ac002c506cc	(253, 12)
mpath12	(253, 7)
mpath11	(253, 10)
mpath10	(253, 11)


I wonder if that can cause a problem.

Regards,

Victoria




brem belguebli said the following on 04/26/2010 05:56 PM:
> Best thing to do, if you don't want to destroy data, would be to:
>
> 1) copy your original bindings file from /var to /etc (in newer versions
> of dm-multipath, bindings file is located under /etc/multipath/bindings)
> and modify /etc/multipath.conf to tell it the location of bindings file
> (cf /usr/share/doc/device-mapper-multipath-0.4.7/multipath.conf.annotated for the line to add, I don't have a 0.4.7 dm-mp configuration right now)
>
> 2) comment all /dev/mpath* relative entries in /etc/fstab (supposedly
> you are mounting your devices thru fstab) either if using LVM or entire
> raw disks.
>
> 3) reboot your system
>
> 4) mount manually each mpath (in respect to your bindings file) and make
> sure they really correspond to the original ones.
>
> If so, you're done.
>
> Brem
>
> PS: rogue device is something I don't believe in, there is always a
> reason for a device to be seen.....
>
>
>
> On Mon, 2010-04-26 at 15:13 -0600, Victoria A Smith wrote:
>> It is on /var (/var/lib/multipath/bindings), and /var is a separate LV
>> from /.
>>
>> I am beginning to think the WWID 350002ac002c506cc is a "rogue" device
>> and should be removed from the system.
>>
>> Regards,
>>
>> Victoria
>>
>>
>> brem belguebli said the following on 04/26/2010 05:00 PM:
>>> Is your bindings file located on a different [lv|partition] than / ?
>>>
>>> It may cause this kind of troubles if so.
>>>
>>> Brem
>>>
>>> On Mon, 2010-04-26 at 13:58 -0600, Victoria A Smith wrote:
>>>
>>>> After a system crash I have filesystem access problems when
>>>> the multipathd service is started.  I noticed in the messages file
>>>> and in output from multipath -ll that an alias is not being
>>>> used:
>>>>
>>>> messages:  [...] rename 350002ac002c506cc to mpath18
>>>>
>>>> # multipath -ll
>>>> [...]
>>>> 350002ac002c506cc dm-12 3PARdata,VV
>>>>
>>>> # ls -1 /dev/mpath/
>>>> 350002ac002c506cc
>>>> mpath10
>>>> [...]
>>>>
>>>>
>>>> The bindings file has:
>>>> [...]
>>>> mpath18 350002ac002c506cc
>>>>
>>>>
>>>> Can the apparent failure of the alias-to-WWID mapping cause any problems?
>>>>
>>>>
>>>> RHEL5.5
>>>> 2.6.18-194.el5
>>>> device-mapper-multipath-0.4.7-34.el5
>>>> QLogic Fibre Channel HBA Driver: 8.03.01.04.05.05-k
>>>>
>>>>
>>>> Thanks,
>>>>
>>>> Victoria
>>>>
>>>>
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>>>>
>>>
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