[Xen-users] iSCSI domU - introducing more stability

["netz-haut - stephan seitz" <s.seitz@xxxxxxxxxxxx>]

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 
target.
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.


Regards,



Mit freundlichen Gruessen

--
Stephan Seitz
Senior System Administrator

*netz-haut* e.K.
multimediale kommunikation

zweierweg 22
97074 würzburg

fon: +49 931 2876247
fax: +49 931 2876248

web: http://www.netz-haut.de/

registriergericht: amtsgericht würzburg, hra 5054




_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users