If you're trying to use coalesced SAN volumes (and I believe you said
that you are), then you want to INclude block devices under
/dev/mapper and EXclude the rest.  Something like ...

        filter = [ "a|/dev/mapper/.*|", "r|.*|" ]

Someone should confirm that I have the syntax correct.  I can never
remember regex.  :-S    In a prior life, I used something like it with
consistent success.

Alternatively, this should work, but requires that the disk ID logic
presents the coalesced DM devices and not the individual paths ...

        filter = [ "a|/dev/disk/by-id/.*|", "r|.*|" ]

If the coalesced -vs- path req is met, then the latter may be more to
your liking.

-- R;   <><
Rick Troth
Velocity Software
http://www.velocitysoftware.com/

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