Syed Jahanzaib Personal Blog to Share Knowledge !

July 26, 2017

Expanding Guest IDE disk in ESXI

Filed under: Forefront TMG 2010 Related — Syed Jahanzaib / Pinochio~:) @ 9:47 AM

We are using VMWARE Esxi 5.0 server hosting few VM guests. One of our guest machine which is acting as proxy/filter system (Forefront TMG 2010 ) for our users, its  disk space was getting lower (as its total size was 60 GB only). I installed this TMG in year 2012 & I was missing its patches / service packs therefore I was avoiding doing fresh installation. As per Vmware documentation, you cannot increase IDE disk size.


I tried another workaround but for some reasons, it didn’t worked in my case.
I used below workaround & it worked perfectly for me.

  • Power OFF the Target guest VM.
  • Login to ESXI Server via putty or any SSH client.
  • Navigate to folder where your guest VMDK file reside,
  • e.g: /vmfs/volumes/XXXXX/Guestname
  • Note down the .vmdk file name & issue expand command against that file
vmkfstools -X 200G TMG.VMDK

-X = expand
200G = size to increase (total size)
TMG.VMDK = File name which we want to expand

As showed in the image below …

1- space added

Depends on your hardware speed, it may take some time to complete the operation. I had some good IBM hardware & it took around 1-2 minutes to increase the size from 60GB to 200GB.

After few minutes it will populate to ESXI client automatically.

Now power ON the guest machine, and increase the size as required , either using Windwos Disk Management tool or cmd. I used MiniTool Partition Wizard Server Edition 7.1 which worked beautifully to complete the task without any hassle.

Below is Image after the task finished.

2- space added. final snap



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