Re: [dm-devel] how to troubleshoot faulty multipath path?

["Moger, Babu" <Babu Moger netapp com>]

> -----Original Message-----
> From: Rudy Gevaert [mailto:Rudy Gevaert UGent be]
> Sent: Friday, December 16, 2011 9:49 AM
> To: dm-devel
> Subject: [dm-devel] how to troubleshoot faulty multipath path?
> 
> 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

My initial guess is, there could be problem with your configuration.
Can you paste output of "multipath -ll".  How does your multipath.conf
look like.  Can you paste that as well.
You messages file might help also. 


> 
> 
> 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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