dev/sda1 which is 196GB, /dev/mapper/centos-home and /dev/mapper/centos-root Step 3: Perform the cleanup I/O size (minimum/optimal): 512 bytes / 512 bytesĭevice Boot Start End Sectors Size Id Type Sector size (logical/physical): 512 bytes / 512 bytes We booted the virtual machine from the Live CD, when the terminal appeared, we typed fdisk -l to see all available disks and partitions.ĭepending on your configuration you will see the following If you performed your installation using standard partition Disk /dev/sda: 200 GiB, 214748364800 bytes, 419430400 sectors Step 2: Identify partitions and disks using fdisk -l We downloaded the SystemRescueCd Live Image and inserted it to the guest machine as a Live CD. Step 1: Download SystemRescueCd Live Image

Since the filesystem has to be unmounted or mounted as read-only for zerofree to work, we decided to use a Live CD to complete this task as it would be the simplest solution to follow.

We needed to find the unallocated, blocks with non-zero value content in the ext2, ext3 or ext4 filesystem (e.g. We did manage though to reclaim the empty space manually, using the zerofree and VBoxManage utilities.įollowing is the guide we followed to do so: Part 1: Clean-up the guest machine using zerofree Unfortunately, that did not happen even after freeing more than 100GB of space from the guest machine. Recently, we did some cleanup in certain GNU/Linux virtual machines, where we hoped that VirtualBox would release the disk space that is not used and shrink the size of the VDI files. 22 November 2016 in Windows tagged VBoxManage / VDI / virtualbox / zerofree by Tux

Virtualbox increase disk size centos