My excitement for XenServer 5.0 has thawed somewhat!
After initially upgrading some of my servers I decided it seemed a stable release, so I upgraded my live pool. All was going fine until I noticed a number of my VMs were hung, which I thought may have been due to the VMs running the old image containing Xen Tools 4.1.
I decided that my strategy was to reboot my servers, so that the hung VMs would pick up the new image containing Xen Tools 5.0. So I migrated my running VMs to other servers, and rebooted the first server, which initially complained as it had running VMs, but they were hung so i went ahead. However, the unthinkable happened the server never came back up!
The server got rebuilt, but I couldn't get it back into the pool as the broken server was still (logically) there, and it wouldn't let you remove it as it thought it still had VMs on it! I have a fix for this that I will post soon if you're in the same situation.
Looking on the Citrix forums there are some possibly related issues where 5.0 servers are randomly becoming uncontactable, which is worrying to say the least.
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