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Re: [dm-devel] bindings file; rename WWID to mpath alias



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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