Le 1 sept. 07 à 02:57, Claudio Tassini a écrit :
Hi,
I recently upgraded a 2-nodes cluster adding two more nodes. I
would like a single node to remain in cluster even if the other
three are out of service, so I'm trying to add a quorum disk to the
cluster.
The problem is that the quorum disk is a LUN in a shared storage
which has not the same device name through all the cluster nodes.
Moreover, we use device-mapper AND lvm. I could resolve the problem
using an lvm logical volume, because it would always have the same
name and recognize the underlying "dm" or "sd" device name even if
it changes across a reboot, but I've read that it's not advisable
to use a logical volume as quorum device.
Any idea?
--
Claudio Tassini
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using multipath -ll you'll see that your multipath device has got a
unique id (wwid) :
# multipath -ll
/dev/mpath/mpath2 (200c0b60a76000032) dm-3 SNAP,FILEDISK
[size=10M][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 2:0:0:0 sdd 8:48 [active][ready]
\_ 1:0:0:0 sdc 8:32 [active][ready]
all you have to do then, is to modify your /etc/multipath.conf file
to ask a fixed name for this multipath device instead of having it
get a dynamique name (/dev/mpath/mpathx) :
/etc/multipath.conf :
...
multipaths {
multipath {
wwid 200c0b60a76000032
alias qdsk1
}
}
and then :
# multipath -ll
[EMAIL PROTECTED] ~]# multipath -ll
qdsk1 (200c0b60a76000032) dm-4 SNAP,FILEDISK
[size=10M][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 4:0:0:0 sdf 8:80 [active][ready]
\_ 3:0:0:0 sde 8:64 [active][ready]
(please, be warn that the first time you do it, it rename the
multipath device to the name you have ask for, but it fails to rename
the /dev/mpath/ device, so you have to do it manually once).
do it on all your cluster members and they all get the multipath
device with the same name.
I have also encoutered a problem with cman that refuse to register a
node with more than 16 chars (qdiskd register the qdisk device as a
node name). So you must ensure your device path is less than 16 chars
for a qdisk device (this is why I use /dev/mpath/qdsk1 instead of /
dev/mpath/qdisk1).
Regards,
--
Alain RICHARD <mailto:[EMAIL PROTECTED]>
EQUATION SA <http://www.equation.fr/>
Tel : +33 477 79 48 00 Fax : +33 477 79 48 01
E-Liance, Opérateur des entreprises et collectivités,
Liaisons Fibre optique, SDSL et ADSL <http://www.e-liance.fr>
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