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12.2.3. Creating a Partition-based Storage Pool Using virsh
This section covers creating a partition-based storage pool with the
virsh
command.
Warning
Do not use this procedure to assign an entire disk as a storage pool (for example,
/dev/sdb
). Guests should not be given write access to whole disks or block devices. Only use this method to assign partitions (for example, /dev/sdb1
) to storage pools.
Procedure 12.2. Creating pre-formatted block device storage pools using virsh
Create the storage pool definition
Use the virshpool-define-as
command to create a new storage pool definition. There are three options that must be provided to define a pre-formatted disk as a storage pool:- Partition name
- The
name
parameter determines the name of the storage pool. This example uses the name guest_images_fs in the example below. - device
- The
device
parameter with thepath
attribute specifies the device path of the storage device. This example uses the partition /dev/sdc1. - mountpoint
- The
mountpoint
on the local file system where the formatted device will be mounted. If the mount point directory does not exist, thevirsh
command can create the directory.The directory /guest_images is used in this example.
# virsh pool-define-as guest_images_fs fs - - /dev/sdc1 - "/guest_images" Pool guest_images_fs defined
The new pool and mount points are now created.Verify the new pool
List the present storage pools.# virsh pool-list --all Name State Autostart ----------------------------------------- default active yes guest_images_fs inactive no
Create the mount point
Use thevirsh pool-build
command to create a mount point for a pre-formatted file system storage pool.# virsh pool-build guest_images_fs Pool guest_images_fs built # ls -la /guest_images total 8 drwx------. 2 root root 4096 May 31 19:38 . dr-xr-xr-x. 25 root root 4096 May 31 19:38 .. # virsh pool-list --all Name State Autostart ----------------------------------------- default active yes guest_images_fs inactive no
Start the storage pool
Use thevirsh pool-start
command to mount the file system onto the mount point and make the pool available for use.# virsh pool-start guest_images_fs Pool guest_images_fs started # virsh pool-list --all Name State Autostart ----------------------------------------- default active yes guest_images_fs active no
Turn on autostart
By default, a storage pool defined withvirsh
, is not set to automatically start each timelibvirtd
starts. To remedy this, enable the automatic start with thevirsh pool-autostart
command. The storage pool is now automatically started each timelibvirtd
starts.# virsh pool-autostart guest_images_fs Pool guest_images_fs marked as autostarted # virsh pool-list --all Name State Autostart ----------------------------------------- default active yes guest_images_fs active yes
Verify the storage pool
Verify the storage pool was created correctly, the sizes reported are as expected, and the state is reported asrunning
. Verify there is a "lost+found" directory in the mount point on the file system, indicating the device is mounted.# virsh pool-info guest_images_fs Name: guest_images_fs UUID: c7466869-e82a-a66c-2187-dc9d6f0877d0 State: running Persistent: yes Autostart: yes Capacity: 458.39 GB Allocation: 197.91 MB Available: 458.20 GB # mount | grep /guest_images /dev/sdc1 on /guest_images type ext4 (rw) # ls -la /guest_images total 24 drwxr-xr-x. 3 root root 4096 May 31 19:47 . dr-xr-xr-x. 25 root root 4096 May 31 19:38 .. drwx------. 2 root root 16384 May 31 14:18 lost+found