Cannot increase datastore size in vSphere

Hello,

I have the issue as described in "Cannot grow VMFS datastore, the Increase button is disabled (1035285)".

After checking all the possible reasons described in the KB1035285 article, I find that none of the reasons have caused this issue.

So any other possible reasons have caused the "the Increase button is disabled" issue?

If you have any idea, welcome your responses,

PS:

My versions of the product are

vSphere Client v5.1,

ESXi v5.1

Thank you,

KuoHsin