Re: [Xen-users] iscsi conn error: Xen related?

[Tomasz Chmielewski <mangoo@xxxxxxxx>]

Fred Blaise schrieb:
> Hello all,
>
> I got some severe iscsi connection loss on my dom0 (Gentoo 
> 2.6.20-xen-r6, xen 3.1.1). Happening several times a day.
> open-iscsi version is 2.0.865.12. Target iscsi is the open-e DSS product.
>
> Here is a snip of my messages log file:
> May  5 16:52:50 ying connection226:0: iscsi: detected conn error (1011)
> May  5 16:52:51 ying iscsid: connect failed (111)
> May  5 16:52:51 ying iscsid: Kernel reported iSCSI connection 226:0 
> error (1011) state (3)
> May  5 16:52:53 ying connection215:0: iscsi: detected conn error (1011)
> May  5 16:52:53 ying iscsid: connect failed (111)
> May  5 16:52:53 ying iscsid: connect failed (111)
> May  5 16:52:53 ying iscsid: connect failed (111)
> May  5 16:52:53 ying iscsid: connect failed (111)
> [...]
>
> and sometimes:
> May  5 16:53:11 ying iscsid: connection227:0 is operational after 
> recovery (6 attempts)
> May  5 16:53:11 ying iscsid: connection221:0 is operational after 
> recovery (6 attempts)
> May  5 16:53:12 ying iscsid: connection214:0 is operational after 
> recovery (9 attempts)
I doubt it's Xen related.

I'm running lots of dom0s and domUs (and non-Xen) running as iSCSI 
initiator mostly without such problems.
If it ever happens, it can mean a problem with:

1) iSCSI target implementation,
2) either the target or initiator is very loaded (or both).


Did you try changing the iSCSI target, either to tgt or SCST? I'm not 
sure what targer you have with e-open; I think they wanted to migrate to 
SCST, but used buggy IET before (or stil use, I'm not sure).
Any other messages/logs?


2.6.25 has a nice feature with soft lockups detection, i.e. it will 
print such messages when machine is severely loaded (it may indicate 
some problems):
May  3 00:46:33 backup1 kernel: INFO: task sync:4875 blocked for more 
than 120 seconds.

--
Tomasz Chmielewski
http://wpkg.org

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