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).
--
Chrissie
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