Advanced Storage and Networking Features - Getting Started with Red Hat Enterprise Virtualization - page 125

Virtual disk resize
In RHEV 3.3 and later, one can perform a resize of a virtual guest disk without taking the
downtime of the virtual guest so that users don't have to change application or data loca-
tions that run on those virtual machines. To perform an online virtual disk resize of the run-
ning guest, perform these steps:
1. Log in to the Administrator console and navigate to the Virtual machines tab.
2. Select the appropriate virtual machine and navigate to Disks at the bottom pane of
the selected virtual machine.
3. Select the disk and click on Edit . Under Extend size by(GB) , type the disk size in
GB to be added to extend the existing virtual disk size (as shown in the following
diagram). Note that the target disk status should be changed to Locked status dur-
ing the time when it's being resized, and then changed to OK after its been resized.
4. Online virtual disk resize is not supported for floating or shareable disks, and
shrinking the virtual disk is also not supported.
Alternatively, if application or data locations of virtual machines is not on priority, one can
resize the disk size of the Linux guest with LVM as a root storage (by adding another disk),
and extend the logical volume. Similarly, for Windows guests, disk resize can be achieved
using the built-in disk management tool using dynamic disks supported in the latest version
of the Windows operating system as an alternative to the preceding steps in extending the
virtual disk.