We have upgraded our datastores from vmfs 3 to vmfs 5.
Now we are currently in process of extending all our 500 GB LUNS to 1 TB.
When storage team extends our LUNS and we add them back to vCenter Server and then when we RESCAN all the host. At that time all the HOST gets greyed out and CPU utilisation of all the HOST within that CLUSTER increases.
I am unable to understand this behaviour of ESXi 5 HOST.
We have Site Recovery Manager implemented in our enviorment. Can that be a reason ?