Jenifer,

Thanks for uploading the file.

That's a cool, relatively large topology -- if I got it right, you've
got 3x 2-port FC adapters (thus 6 FC SCSI hosts) connected via
switch/fabric to a 2-port storage (thus 12 paths per LUN.)

The good news is multipath has visibility of all 12 paths per LUN, so
not a path detection/discovery issue.

Interestingly, it also has displays the current multipath devmaps table
and status (from device mapper), and that *does* show 12 paths, in
Active status, in 2 priority groups as expected (ALUA storage.)

Therefore, as the multipath devmaps appear to be configured correctly, this 
suggests the issue seems be on path listing (multipath -ll).  
(The evidence that missing paths also happen on the direct-attached system, w/ 
4 paths per LUN, possibly supports that, in the sense that this is not related 
to the attachment type, ie, fabric/direct.)

Could you please attach the output of these commands?

# multipath -ll -v3 > multipath-ll-v3.log 2>&1

# dmsetup table  > dmsetup-table.log  2>&1
# dmsetup status > dmsetup-status.log 2>&1

Thanks,
Mauricio

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https://bugs.launchpad.net/bugs/1860587

Title:
  multipath -ll doesn't discover down all paths on Emulex hosts

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