Expansion of datastore not complete.

I have a 16 TB storage fibre and I added 8 TB more and I tried to expand current datastore from ESXi 6.5 I selected custom 4TB and it shows now 20TB.
But now I cannot use the remaining 4TB anyone can help me add that and make it useful.
 
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MASEE Solution Guide - Technical Dept HeadAsked:
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
If you now select Increase Datastore do you have 4TB available as unclaimed to expand into?
MASEE Solution Guide - Technical Dept HeadAuthor Commented:
-->If you now select Increase Datastore do you have 4TB available as unclaimed to expand into?
No
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
It's possible it cannot use it to expand into because of it's location/layout e.g. not contiguous.
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MASEE Solution Guide - Technical Dept HeadAuthor Commented:
Can we undo the expansion and redo with 2 volumes?
I mean delete 8TB volume and create 2 4TB volumes and expand 2 LUNs from ESXi

Many thanks for your reply.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
You can delete any datastores from ESXi.

You cannot undo the expansion.

You've got to remove the entire datastore, because if you were to remove the expansion, the datastore would be corrupted.

It is always better to use a datastore per LUN, than try and expand.

and as for using spare space on other LUNs to make a datastore can be done but is very risky unless you have very good documentation.

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andyalderCommented:
Are you sure that this (and your previous MSA2050 expansion question) aren't just manifestations of the storage box presenting the LUN before background scrubbing is complete? I'm not an expert on the 2050 but previous Dot Hill clone MSAs have allowed you to present the LUN early so the OS install program can see it but actually writing to it times out until the scrub is complete.
MASEE Solution Guide - Technical Dept HeadAuthor Commented:
I deleted both and created  a new one with bigger size.
but It shows unallocated.
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