Same issue our side. Did 2x clean R540 hosts no problem, but stuck with the 10+ other clusters - different VCSA's etc. Call open with support. No errors in esxupdate logs - just mention in lifecycle: ERROR Failed to delete pidfile(/var/vmware/lifecycle/lifecycle.apply.pid) Might be interesting if you have the same- reboots of the host made no difference, we are also using dell approved images for u2.