Reducing Disk Capacity

Virtuozzo provides a possibility to reduce the size of an expanding virtual disk by setting the limit the disk cannot exceed. To do this, use the prlctl set --device-set command. For example:

# prlctl set MyVM --device-set hdd0 --size 30G

When reducing the disk capacity, keep in mind the following:

• You cannot reduce the capacity of a virtual disk used by a virtual machine if the virtual machine is running.
• The virtual machine using the virtual disk you want to configure must not have any snapshots. In this case, you should delete all existing snapshots and run the command again. To learn how to delete snapshots of a virtual machine, refer to Deleting Snapshots.
• The capacity of an expanding virtual disk shown from inside the virtual machine or Container and the size the virtual disk occupies on the server's physical disk may differ.
• You cannot reduce XFS filesystems on LVM (the default choice for CentOS 7 and Red Hat Enterprise Linux 7).

Checking the minimum disk capacity

If, before reducing disk capacity, you want to know the minimum to which it can be reduced, use the prl_disk_tool resize --info command. For example, if the disk hdd0 of the virtual machine MyVM is emulated by the image /var/parallels/MyVM.pvm/harddisk.hdd, run the following command:

# prl_disk_tool resize --info --hdd /var/parallels/MyVM.pvm/harddisk.hdd

Disk information:

...

Minimum: 2338M

...