Issue

• An EMC SAN LUN is supposed to be a 5MB ACLX but multipath thinks that the scsi_id derived from that WWN actually belongs to a different device (which also doesn't match the scsi_id listed in multipath_bindings):

Symmetrix ID: 000000000000
/dev/mapper/mpath8     00A4 12G:0 07B:D0  2-Way Mir     N/Grp'd ACLX WD       6

# /usr/symcli/bin/symdev -sid 3592 show 00A4 | grep -i wwn 
    Encapsulated WWN         : N/A
    Device WWN               : 60000970000192603592533030304134

• Multipath –l resolves mpath8 as mpath411, but with the WWN that should belong to mpath8, and paths that belong to mpath411.

# multipath -l mpath8
mpath411 (360000970000192603592533030304134) dm-56 EMC,SYMMETRIX
[size=68G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 3:0:6:118 sdchy 133:2112 [active][undef]
 \_ 2:0:6:118 sdcif 133:2224 [active][undef]

• However, looking at the scsi_id of the paths that supposedly feed mpath411, they have a different scsi_id/WWN (the one that belongs to the real mpath411 which is 68G):

 # scsi_id -g -s /block/sdchy
360000970000192602216533036373438

• Multipath –l on mpath411 gives me yet a different device.

# multipath -l mpath411
mpath551 (360000970000192602216533036373438) dm-877 EMC,SYMMETRIX
[size=68G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 3:0:9:99  sdcwf 68:2672  [active][undef]
 \_ 2:0:9:99  sdcwg 68:2688  [active][undef]

• In essence, multipath –l is reporting data that doesn't match what the rest of the system is reporting.