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[Xen-users] iSCSI domU - introducing more stability

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Subject: [Xen-users] iSCSI domU - introducing more stability
From: "netz-haut - stephan seitz" <s.seitz@xxxxxxxxxxxx>
Date: Mon, 7 Sep 2009 14:24:30 +0200
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Thread-index: AcovtiZSZJUFkJupEd7GhwBQBPU9LA==
Thread-topic: iSCSI domU - introducing more stability
Hi there,

during peak load on some running domU, I noticed random iSCSI "Reported LUNs 
data has changed" which forced me to shutdown the respective domU, re-login the 
target and do a fsck before starting domU again.

This occurred on a 16 core machine, having only about 14 domUs running. Spare 
memory has been occupied by dom0 (about 40G). Each domU has it's own iSCSI 
iSCSI is initiated by open-iscsi via a quad port e1000e w/ offloading and mode0 
bonding (this has recently been changed from 802.3ad to round-robin as the 
switch manuel advices not to use LACP if possible..., however) .

Dom0 is Debian Lenny amd64 (out of the box - setup)

Any ideas how to avoid iSCSI dead locking? I *assume* it's caused by CPU 
saturation, as the load has shown above 16.0 on dom0, but I don't know how to 
throttle I/O...

Oh, using an iSCS HBA instead of open-iscsi would need very good arguments as 
this kind of hardware is not the cheapest...

Thanks in advance.


Mit freundlichen Gruessen

Stephan Seitz
Senior System Administrator

*netz-haut* e.K.
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97074 würzburg

fon: +49 931 2876247
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