Christine Caulfield wrote:
Sajesh Singh wrote:
Christine Caulfield wrote:
Sajesh Singh wrote:
Centos 4.6
Cluster Suite
I am currently running a 2 node GFS cluster. The storage is
provided via a fiber channel connection to the SAN. Each node
currently has a single FC connection to the SAN. I would like to
migrate to using dm-multipath with each node having dual fiber
channel connections to the SAN. Can I assume that CLVM is aware of
the /dev/dm-# devices that are used to access the multipathed
devices? Are there any gotchas that are associated with installing
the device-mapper-multipath software after the GFS cluster is up
and running? Are there any howtos available for this type of setup?
clvmd works fine with dm-multipath devices. You will probably have
to edit /etc/lvm/lvm.conf to exclude the underlying /dev/sd devices
to stop it getting confused though.
You won't be able to do this with GFS mounted on the local node
though, you'll have to umount it, setup dm-multipath, vgscan &
remount. You CAN leave them mounted on other nodes while you do it.
Christine,
Should clvmd be restarted as well so that I can create
new volume groups? I have device-mapper-multipath setup, but if I try
to run pvcreate /dev/mapper/mpath1p1 the command just hangs without
any errors.
No, you shouldn't need to restart clvmd unless you have an old version
and have added or removed PVs (which might be the case if you have
changed multipath devices).
pvcreate does very little in the way of cluster operations so it's
probably worth checking it's not stuck writing to the dm device.
(sorry for the delay in replying, I've been away).
Thanks for the reply. All is working now. I did add PVs, but did not
need to restart as it might just have been the clvmd cache. All was okay
after refreshing the cache.
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