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Re: [dm-devel] Unstable isci path and confusing logging




On Fri, 3 Jul 2009, Charlie Brady wrote:

Jul  3 12:29:59 sun4150node2 multipathd: sdc: rdac checker reports path is up
Jul  3 12:30:04 sun4150node2 multipathd: sdc: rdac checker reports path is up
Jul  3 12:30:09 sun4150node2 multipathd: sdc: rdac checker reports path is up
Jul  3 12:30:14 sun4150node2 multipathd: sdc: rdac checker reports path is up
Jul  3 12:30:19 sun4150node2 multipathd: sdc: rdac checker reports path is up
Jul  3 12:30:24 sun4150node2 multipathd: sdc: rdac checker reports path is up
Jul  3 12:30:29 sun4150node2 multipathd: sdc: rdac checker reports path is up
[root sun4150node2 ~]#

This is the cycle of multipathd failing and reinstating the device:

[root sun4150node2 ~]# grep 8:32 /var/log/messages | tail -12
Jul  3 12:57:38 sun4150node2 multipathd: 8:32: reinstated
Jul  3 12:57:38 sun4150node2 kernel: device-mapper: multipath: Failing path 8:32.
Jul  3 12:57:39 sun4150node2 multipathd: 8:32: mark as failed
Jul  3 12:57:43 sun4150node2 multipathd: 8:32: reinstated
Jul  3 12:57:44 sun4150node2 kernel: device-mapper: multipath: Failing path 8:32.
Jul  3 12:57:44 sun4150node2 multipathd: 8:32: mark as failed
Jul  3 12:57:48 sun4150node2 multipathd: 8:32: reinstated
Jul  3 12:57:50 sun4150node2 kernel: device-mapper: multipath: Failing path 8:32.
Jul  3 12:57:50 sun4150node2 multipathd: 8:32: mark as failed
Jul  3 12:57:53 sun4150node2 multipathd: 8:32: reinstated
Jul  3 12:57:53 sun4150node2 kernel: device-mapper: multipath: Failing path 8:32.
Jul  3 12:57:54 sun4150node2 multipathd: 8:32: mark as failed
[root sun4150node2 ~]#

As further background, I have four iscsi paths configured to two ports on two controllers on a Sun StorageTek 2510 (a bug in the Sun CAM management software has also configured a non-working IPV6 session).

On a related issue, is there any way to learn which of the iscsi paths is associated with which device node (/dev/sdX)?


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