Righteous Hack

When working with virtual machines, it is often advantageous to over allocate and under utilize resources. When it come to virtual hard disks, this is even more common place. On low use or low demand servers, I always use thin provisioning. This saves disk space by only using physical disk space when the guest actually uses the virtual disk. But what about those disks that were created using the thick option, or brought over as thick automatically during a P2V conversion? Time to convert your thick virtual disk to thin.

As always, I recommend backing up all of your data and knowing what you are doing. Test this in a non-production environment.

Converting disks from thick to thin is actually quite easy and can be accomplished using these steps:

1. Log into your ESX host using SSH and cd into the VM directory that contains your virtual disk.

2. Shutdown the VM so that we can get exlusive access to the virtual disk.

3. Run vmkfstools -i yourthickdisk.vmdk -d thin yourthindisk.vmdk

4. Edit the settings for your VM and remove the existing drive. Add a new hard drive and choose the existing drive option.

5. Boot the VM and enjoy.

Note: Dont forget to go back to ESX server and remove the old .vmdk and -flat.vmdk files once you are sure that your VM is operating normally off the thin disk.

–Himuraken

After a clean install/upgrade of Ubuntu 7.10 (Gutsy Gibbon) you may be unable to get gdesklets to run. I have noticed several threads out there with no resolution so I thought I would post a fix. Most users will get the app installed successfully but when they run the gdesklets shell, the app begins to load, goes gray, and then has to be closed using force quit. Also, running gdesklets start from a console shows that the daemon is starting but it never does. By default Gutsy Gibbon uses Python 2.5 while gdesklets is looking for 2.4. This is pretty straight forward to resolve using these steps. Install python2.4 by running sudo apt-get install python2.4 from a console. After that is complete we need to tell gdesklets to use Python2.4. From the console we need to add a few entries to the gdesklets config files. Locate the line that says “#! /usr/bin/env python” and append it with a 2.4. So each line should now look like “#! /usr/bin/env python2.4″. This line needs to be updated at the top of each of the files listed below.

/usr/lib/gdesklets/gdesklets
/usr/lib/gdesklets/gdesklets-shell
/usr/lib/gdesklets/gdesklets-daemon
/usr/lib/gdesklets/gdesklets-migration-tool

After updating the files with your favorite text editor, start the app by running gdesklets start from a console. This should have you up and running in no time.

–himuraken