[dm-devel] Multipath ID not equal to LUN scsi ID

[Martin Wilck]

On Mon, 2017-07-10 at 17:58 +0800, liuqing at huayun.com wrote:
> Dear list,
> We have a FC storage and using multipathd to manager the FC paths.
> I've met an issue in this environment. The following is how to
> recreate the issue.

Which version of multipath-tools have you been using? Could you please
run multipathd with "-v 3" and provide the logs of the procedure below?

Is there a specific reason why you are using the "getuid_callout"
option rather than "uid_attribute"?

Regards,
Martin

> 
> =======
> 1. Map a LUN to host with LUN ID 0,
> 2. rescan fc_host, a new path will be found by multipath.
> 3. Unmap LUN 0.  path will failed as following.
> [root at localhost sys]# multipath -ll
> Jul 10 18:41:50 | sdp: couldn't get asymmetric access state
> Jul 10 18:41:50 | sdq: couldn't get asymmetric access state
> 36005076300810eadf800000000000156 dm-3 IBM,2145
> size=8.0G features='2 queue_if_no_path retain_attached_hw_handler' hw
> handler='1 alua' wp=rw
> |-+- policy='service-time 0' prio=0 status=enabled
> | `- 2:0:0:0 sdp 8:240 failed faulty running
> `-+- policy='service-time 0' prio=0 status=enabled
>   `- 2:0:1:0 sdq 65:0  failed faulty running
> 4. Map another LUN which have different ID_SERIAL but with the same
> LUN ID(0). Multipath(check_path function) will set the paths up, tur
> checker will successfully test the LUN. 
> [root at localhost sys]# /lib/udev/scsi_id --whitelisted --replace-
> whitespace --device=/dev/mapper/36005076300810eadf800000000000156
> 36005076300810eadf800000000000155
>  I think this is not right, although I do not remove the device by
> 'echo 1> /sys/block/sdp/device/delete'. A multipath is identified by
> LUN scsi ID, in this situation the multipath
> ID is not equal to LUN scsi ID. And if I add the previous LUN back,
> the paths will also be added to that multipath
> id(36005076300810eadf800000000000156).
> 
> Any suggestion on how to make it create a new node in /dev with
> correct scsi ID? Thanks.
> 
> 
> ===========
> [root at localhost sys]# cat /etc/multipath.conf
> defaults {
>     features "0"
>     no_path_retry           queue
>     getuid_callout "/lib/udev/scsi_id --whitelisted --replace-
> whitespace --device=/dev/%n"
> }
> blacklist {
>     devnode "sd[a-m]"
> }
> 
> liuqing at huayun.com
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> dm-devel at redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel

-- 
Dr. Martin Wilck <mwilck at suse.com>, Tel. +49 (0)911 74053 2107
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)