Slow reboot of ESX host

You may experience this issue if:
  • The ESX host is hosting a passive Microsoft Cluster node. This includes ESX hosts that are exposed to the LUNs used for MSCS but have no virtual machines that participate in Microsoft clustering.
  • The virtual machine configured for the Microsoft Cluster uses an RDM. This includes RDMs exposed to the virtual machine with virtual SCSI bus sharing set to either Physical or Virtual.

When ESX hosts a virtual machine in these scenarios, attempts by any ESX host (other than the one that is hosting the Active node) to conduct I/O to the LUNs used by the Microsoft Cluster results in an I/O error. This behavior is expected as the active Microsoft Cluster node maintains a SCSI reservation on the RDM LUNs. 

Full article at


About PiroNet

Didier Pironet is an independent blogger and freelancer with +15 years of IT industry experience. Didier is also a former VMware inc. employee where he specialised in Datacenter and Cloud Infrastructure products as well as Infrastructure, Operations and IT Business Management products. Didier is passionate about technologies and he is found to be a creative and a visionary thinker, expressing with passion and excitement, hopefully inspiring and enrolling people to innovation and change.
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