[dm-devel] Unstable isci path and confusing logging

[Charlie Brady]

On Fri, 3 Jul 2009, Charlie Brady wrote:

> 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).
...
> The path checker apparently finds the 8:32 path as intermittent:

I have found these logs:

Jul  2 15:33:29 sun4150node2 kernel: sd 9:0:0:0: rdac: LUN 0 (unowned)
Jul  3 10:07:34 sun4150node2 kernel: sd 9:0:0:0: queueing MODE_SELECT command.
Jul  3 10:07:34 sun4150node2 kernel: sd 9:0:0:0: MODE_SELECT failed with sense 0x62904.
Jul  3 10:07:37 sun4150node2 kernel: sd 9:0:0:0: queueing MODE_SELECT command.

and wonder whether this thread (and patch) is relevant:

http://kerneltrap.org/mailarchive/linux-scsi/2008/10/30/3873414

I'll apply the patch, build new scsi_dh_rdac module, reboot and see what 
the state is.