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Is XenEnterprise v4 Reliable and Fault Tolerant?

Is XenEnterprise v4 reliable and fault tolerant?  If you ask XenSource CTO Simon Crosby - please don't really ask him, ;) - he'll tell you the answer, of course is an unequivocal “yes”.

In his latest blog post, Simon explains the difference between VMware's fault tolerance and that of XenEnterprise v4: 

"...XenEnterprise v4 takes this concept one step further, unlike VMware with its single-point-of-failure management tool, Virtual Center. VC is a traditional heavyweight management app with a database that owns authoritative state on the managed set of hosts, and is therefore vulnerable to catastrophic failure. Tiring of hearing about IT managers asking whether we offer DR for our XenCenter management solution (something they believe is required for their VMware installations), I’m always delighted to tell them that we do for management state what we can do for VMs. In a XenEnterprise v4 resource pool, all management state for all hosts and all VMs is stored redundantly in every host in the cluster. At any time, one host is the pool leader, offering a powerful pub-sub XenAPI interface to our XenCenter management console (and 3rd party apps) that delivers notifications, performance stats and the like, and takes instructions for the pool to execute (managing VM lifecycle, for example). But if the pool leader fails … any other server in the resource pool can simply take over the job with no state loss. Just one of the cool features in XenEnterprise v4 worth a mention."

Find out more from Simon Crosby by reading his entire post, here.

Published Friday, September 07, 2007 6:08 AM by David Marshall
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