Reset LUN and release the lock on runing ESX server

1. Check in Configuration/Storage Adapter the name of controller,track and partition number of stuck LUN (for example vmhba1:2:1)

2. Connect to the servers's console

3. run:
vmkfstools -L lunreset vmhbaC:T:P; vmkfstools -D vmhbaC:T:P
where C- controller, T - track, P - partition

For our example :

vmkfstools -L lunreset vmhba1:2:1; vmkfstools -D vmhba1:2:1

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