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

To: Tomasz Chmielewski <mangoo@xxxxxxxx>
Subject: Re: [Xen-users] iscsi conn error: Xen related?
From: Fred Blaise <fred.blaise@xxxxxxxxxxx>
Date: Thu, 08 May 2008 16:19:25 +0200
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Just for info, bumping up the timeout settings seemed to have a positive effect. I haven't had a machine crash in the last couple days, whereas before, it'd happen a few times a day.

Thank you.


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:


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.


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).

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