Perform the below steps -
1) Right click on the cluster --> Storage --> Rescan All --> To perform 'Rescan All' operation on all the hosts accessing the datastore.
2) Once the rescan is completed on all the hosts, login to a host directly and expand the datastore.
3) Right click on the cluster --> Storage --> Rescan All.
Now the vCenter should consistently report the new capacity of the datastore.
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Cheers,
Supreet
