Situation: Rolling pool upgrade was greyed out for the two XenServer 6.0.2 hosts I had in a resource pool. The option to tick and select them all existed – but wouldnt ‘stick’

Solution: Simple one this one – it was more me being dense. Need to make sure your XenCenter console is first upgraded to the new version. (I though I had already performed this, but the admin machine I was on had its snapshot reverted!) The console will not tell you there is nothing to upgrade or that your xencentre needs to be upgraded.

Steps:

Upgrade XenCentre Console on my admin box to 6.x

Mount CD and setup NFS share for data / XenServer 6.x upgrade

Open the XenCentre Console and select Tools > Rolling Pool upgrade

Select the servers – FINALLY progress to the next step!