In this scenario first involve storage team for checking pool size from storage side , if its near to full then ask them reclaim space.

In my case vcenter server version was lower then ESXi build. Upgrade vcenter server also.

I upgrade it as vCenter Server 5.5 Update 3e Build 4180647.


Storage error :- VMAX Recovery team identified Pool 005 Prod-GP-R531 was 100% full. Errors "2A39" that logged for the devices means that "write failing as it can’t get space