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

[Fred Blaise <fred.blaise@xxxxxxxxxxx>]

Tomasz Chmielewski wrote:
> Fred Blaise schrieb:
> > Hey Thomasz,
> >
> > I could get an interesting and clear trace when things started going 
> > south this morning... for no appearant reason (ie: no load). Load 
> > shouldn't be a problem is this environment yet.
> > Starting with nop-out timing out.. then sank from there to fail all I/O.
> Does it by chance happen about when you restart your iSCSI initiators or 
> disconnect briefly?
> I'm not sure what e-open uses, but here is some read about it:
>
> http://blog.wpkg.org/2007/09/09/solving-reliability-and-scalability-problems-with-iscsi/ 
Good read. Thanks for that.

> > I indeed also opened a ticket with open-e, but haven't gotten an 
> > answer yet.
> > I also launched a ping -s 8192 -i 3 -I ethXX to the storage, to see if 
> > I am losing icmp packets when the iscsi connections are lost.
> And?
Still waiting for a timeout... I can report back, even though it will be 
my last post (at least directly to your email).
> > Upgrade can be an option soon.. I also saw xen 3.1.2 was out, so I may 
> > upgrade everything at once in a while if the problem persist and no 
> > solution is found.
> > The switches doesn't have anything in the log that could indicate any 
> > issue with jumbo frames, or anything else for that matter.
> These timeouts are longer than 120 seconds, and the session is dropped 
> in that case.
> You could increase the timeout in /etc/iscsi/iscsid.conf 
> (node.session.timeo.replacement_timeout) to a much greater value - in 
> most cases it's a good idea (not only a workaround for your problem 
> until you find a solution, but often helpful if you want to upgrade the 
> iSCSI target, replace cabling, switches etc.).
> Anyway, the topic is not very Xen-related and should be directed to a 
> iSCSI-specific list (or e-open support, maybe).
... right, as said above.

Thanks a lot for the insights, very helpful.
>
Best,

fred


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