Hello,
There could be a hung migration process (thus the 'another task in process' message) you could kill any task issues by vCenter to the host by restarting hostd and vpxa agents on the host via SSH:
#/etc/init.d/hostd restart
#/etc/init.d/vpxa restart
The host will disconnect from vCenter momentarily but the VMs will still be running on them (provided they are running at all).
Then you can try manually vMotioning the VMs to other hosts, this will also tell you why if any reason it cannot migrate them automatically.
Once evacuated, reboot the host.
Bob
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