Our notification system alerted me this morning that one of the virtual servers in a small cluster was running out of space on one of its disks. To head off the same on the other servers and other disks, I hopped into vSphere and expanded the size of all disks on all the servers, then hopped into Server Manager to extend each volume.

For 3 of the servers, this worked like a charm, but on one server, one disk failed to extend -- the error in Server Manager was simply "Extend Failed". Logging into that server and opening Disk Management, I can see that the partition has been extended to 120 GB as it should, but the volume still has only an 80 GB capacity: Volumes

Disk 2 (E:) partition

I'm less concerned with how this happened than I am with how to fix it now that it has. I can't extend it because "Extend Volume" thinks it's 120 GB, yet the volume itself thinks it is only 80 GB. Worst-case scenario I can delete and re-create the volume, but as it would take time to rebuild the data I'd prefer to avoid that option if at all possible.

How do I get my E: drive to realize that it really does have 120 GB available to it, not merely 80 GB?

  • Try running diskpart or the PowerShell cmdlets for disk management (I think it's Resize-Partition), and see what happens. You should, at least, get a more useful error message. Dec 12 '14 at 17:42
  • 1
    Have you rebooted it? Have you tried running extend filesystem in diskpart?
    – joeqwerty
    Dec 12 '14 at 17:42
  • @joeqwerty I did reboot to no effect, and had actually just found and tried the extend filesystem command -- with great success! If you want to post that as an answer I'll gladly accept it.
    – Kromey
    Dec 12 '14 at 17:46

Try running extend filesystem for the volume in question in diskpart.

  • This was exactly the magic that solved my problem!
    – Kromey
    Dec 12 '14 at 17:48
  • Glad to help...
    – joeqwerty
    Dec 12 '14 at 17:48
  1. diskpart
  2. list volume
  3. select volume x
  4. extend filesystem

See this blog post for details.

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