I was pretty content about expanding a VMFS datastore provisioned from an IBM DS3512 iSCSI storage array until I read the manual:
https://www.redbooks.ibm.com/Redbooks.nsf/RedbookAbstracts/sg247914.html?Open
It states the following hosts are supported for expansion (section 9.5.7):
The operating systems that support a dynamic increase of capacity in a mapped logical drive are: AIX Linux NetWare Solaris Windows Dynamic Disks Windows Basic Disks
It doesn't list ESX specifically but I've quite happily expanded VMFS LUNs on other storage arrays without any issues. Can I expand a VMFS LUN on a DS3512 iSCSI array?
Thanks