[dm-devel] multipath configuration questions

["Christopher C. Weis" <ccweis gmail com>]

Hello.  I don't know if this is the proper place to post this, so please
point me to the correct list if it isn't.

I have a multipath SAN environment with storage controllers that are
active/active.  However, the controllers are not active/active at the
LUN-level without a performance penalty, meaning if two servers want to
see the same LUN (as in a clustered filesystem environment), they both
need to be using the same controller.  I'm trying to figure out a way to
statically "order" the paths so that I can copy a config to all of the
nodes using the CFS.

>From what I've read, in a single-server environment with controllers
such as the ones I'm dealing with, the path_grouping_policy should be
set to "group_by_serial", which should work fine, but in a clustered
environment, I need to be sure that the path ordering is the same.

Are there any path_selectors, other than round-robin, that might
accomplish this?  Any other ideas?

Thanks.  I appreciate any information that can be offered.

~Chris