Wednesday, March 6, 2013

XS - Multipathing



Firstly Check true multipath status (XenCentre can report it incorrectly). You should see two paths in Round Robin for each Storage Repository

Multipath –ll


If this reports two per SR as expected then we simply need to tell XenCentre to update/refresh its view this is accomplished by running the below command, give it a minute and XenCentre should then report the correct number of connections.

/opt/xensource/sm/mpathcount.py


If the multipath –ll doesn’t report as expected the quickest and simplest way to resolve is to put the host in maintenance mode, disable multipathing wait 2 minutes and then re-enable multipathing. Wait a couple of minutes and then check the multipath status as per above. Once happy you can leave maintenance mode.  This seems to sort the problem 9/10 times.  Failing that if you may need to restart the open-iscsi service, command below;  

Service open-iscsi restart

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