[Linux-cluster] Multipathing, CLVM and GFS

Christine Caulfield ccaulfie at redhat.com
Thu Jul 3 07:29:51 UTC 2008

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.



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