SysadmandineOne day, sysadmins will rule the world…

Sometimes, you need more space on a virtual machine disk than you thought in the beginning. Hopefully, if your domU disk is in a .img file, you can do it quite easily (you can do it easily with lvm partition too, even if it’s a different method). Here’s how to do it, as root of course :

- Check your partitions in your domU :

- create empty file of the size we want to add : (10gb here)

- stop your domU

- backup img files

- add the empty file to the img file :

You can repeat this step as many times as you need

- tell the filesystem to check and adapt its size :

- restart your domU

- check in your domU that everything is ok

Voila! Your disk is now bigger :)

You can also use this method to create a brand new blank disk image, and add it as a new disk for you domU :

or

add the new disk (xvda3) to your /etc/xen/mydomU.cfg :

after rebooting you domU, check if the new disk is available :

You’re now free to create your filesystem on this disk, and to mount it wherever you want!

This Howto was made under Ubuntu Hardy, Xen 3.2

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