how to troubleshoot faulty multipath path?

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Hello,

I'm running an IBM DS3400 and am seeing a faulty paths:

mail11-ds3400-1 (3600a0b80005a591a0000042b4cac46de) dm-2 IBM,1726-4xx  FAStT
size=550G features='1 queue_if_no_path' hwhandler='1 rdac' wp=rw
|-+- policy='round-robin 0' prio=0 status=enabled
| `- 1:0:0:11 sdd  8:48   active faulty running
`-+- policy='round-robin 0' prio=-1 status=active
  `- 5:0:0:11 sdr  65:16  active undef  running
mail10-ds3400-1 (3600a0b80005a67b60000046a4cac4613) dm-1 IBM,1726-4xx  FAStT
size=550G features='1 queue_if_no_path' hwhandler='1 rdac' wp=rw
|-+- policy='round-robin 0' prio=0 status=enabled
| `- 5:0:0:10 sdq  65:0   active faulty running
`-+- policy='round-robin 0' prio=-1 status=active
  `- 1:0:0:10 sdc  8:32   active undef  running
mail15r-ds3400-1 (3600a0b80005a67b60000046d4cac464f) dm-6 IBM,1726-4xx FAStT
size=550G features='1 queue_if_no_path' hwhandler='1 rdac' wp=rw
|-+- policy='round-robin 0' prio=0 status=enabled
| `- 5:0:0:15 sdv  65:80  active faulty running
`-+- policy='round-robin 0' prio=-1 status=active
  `- 1:0:0:15 sdh  8:112  active undef  running


The storage software says those luns are not 'on the preferred path'.

I'm a bit clueless where to look next.

I see on the storage software that other luns are on that controller, so it seems to me that controller/path is not the problem.

Where should I look next? I'm afraid that if I change the ownership it will take the lun offline.

Thanks in advance,

Rudy

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