I created Datastore1 on LSI 27 TB internal RAID5 disk array but maximum it would allow was 16 TB.
I increased datastore capacity by expanding existing VMFS datastore extent.
It completed successfully and the underlying partition now occupies the entire disk but Datastore1 still only shows 16 TB capacity:
[root@HOS-BDR:~] partedUtil getptbl /vmfs/devices/disks/naa.600605b00d01e52022503a8b0634a7e5
gpt
3647399 255 63 58595475456
1 2048 58595475422 AA31E02A400F11DB9590000C2911D1B8 vmfs 0