[SATLUG] multipath issues on SLES 10SP2.
Enrique Sanchez Vela
esanchezvela at yahoo.com
Fri Jul 3 15:19:43 CDT 2009
We're deploying a number of systems using SUSE 10SP2 using EMC storage with multipath & LVM, and we have a bit of a problem, we have two groups of systems, ones showing /dev/dm-XX physical volume name (groupA) and the ones showing /dev/mapper/mpathXX name (groupB) when using the pvs command, the /etc/lvm/lvm.conf and /etc/multipath.conf files are exactly the same on both groups.
here is the /etc/multipath.conf file .. http://pastebin.com/m7bf38584
and here is the /etc/lvm/lvm.conf one ... http://pastebin.com/m518e5e83
here is the output of pvs on one of the systems of groupA with kernel
Linux systemA 188.8.131.52-0.39.3-smp #1 SMP Mon May 11 11:46:34 UTC 2009 x86_64 x86_64 x86_64 GNU/Linux
and here is the output of one of the servers in groupB with slightly older kernel;
Linux systemB 184.108.40.206-0.21-smp #1 SMP Tue May 6 12:41:02 UTC 2008 x86_64 x86_64 x86_64 GNU/Linux
I've added a EMC share to the system in group A with a lower serial number than the existing ones and restarted the server, the server picks up the new lun but renames all physical volumes starting with dm-0 with the newer lun and from there up, however, it seems to be able to manage the name change and correctly mounts all filesystems, but I still doubt it is working correctly.
multipath was running just fine on all servers while doing the tests.
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