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12.4. LVM-based Storage Pools

This chapter covers using LVM volume groups as storage pools.

LVM-based storage groups provide the full flexibility of LVM.

Note

Thin provisioning is currently not possible with LVM based storage pools.

Note

Refer to the Red Hat Enterprise Linux Storage Administration Guide for more details on LVM.

Warning

LVM-based storage pools require a full disk partition. If activating a new partition/device with these procedures, the partition will be formatted and all data will be erased. If using the host's existing Volume Group (VG) nothing will be erased. It is recommended to back up the storage device before commencing the following procedure.

12.4.1. Creating an LVM-based Storage Pool with virt-manager
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LVM-based storage pools can use existing LVM volume groups or create new LVM volume groups on a blank partition.

Optional: Create new partition for LVM volumes
These steps describe how to create a new partition and LVM volume group on a new hard disk drive.
Warning
This procedure will remove all data from the selected storage device.
1. Create a new partition
  Use the fdisk command to create a new disk partition from the command line. The following example creates a new partition that uses the entire disk on the storage device /dev/sdb.
```
fdisk /dev/sdb
```
```
# fdisk /dev/sdb
Command (m for help):
```
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  Press n for a new partition.
2. Press p for a primary partition.
```
Command action
   e   extended
   p   primary partition (1-4)
```
```
Command action
   e   extended
   p   primary partition (1-4)
```
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3. Choose an available partition number. In this example the first partition is chosen by entering 1.
```
Partition number (1-4): 1
```
```
Partition number (1-4): 1
```
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4. Enter the default first cylinder by pressing Enter.
```
First cylinder (1-400, default 1):
```
```
First cylinder (1-400, default 1):
```
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5. Select the size of the partition. In this example the entire disk is allocated by pressing Enter.
```
Last cylinder or +size or +sizeM or +sizeK (2-400, default 400):
```
```
Last cylinder or +size or +sizeM or +sizeK (2-400, default 400):
```
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6. Set the type of partition by pressing t.
```
Command (m for help): t
```
```
Command (m for help): t
```
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7. Choose the partition you created in the previous steps. In this example, the partition number is 1.
```
Partition number (1-4): 1
```
```
Partition number (1-4): 1
```
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8. Enter 8e for a Linux LVM partition.
```
Hex code (type L to list codes): 8e
```
```
Hex code (type L to list codes): 8e
```
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9. write changes to disk and quit.
```
Command (m for help): w
Command (m for help): q
```
```
Command (m for help): w
Command (m for help): q
```
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10. Create a new LVM volume group
  Create a new LVM volume group with the vgcreate command. This example creates a volume group named guest_images_lvm.
```
vgcreate guest_images_lvm /dev/sdb1
```
```
# vgcreate guest_images_lvm /dev/sdb1
  Physical volume "/dev/vdb1" successfully created
  Volume group "guest_images_lvm" successfully created
```
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The new LVM volume group, guest_images_lvm, can now be used for an LVM-based storage pool.
Open the storage pool settings
1. In the virt-manager graphical interface, select the host from the main window.
  Open the Edit menu and select Connection Details
  
  View larger image
  
  Figure 12.12. Connection details
2. Click on the Storage tab.
  
  View larger image
  
  Figure 12.13. Storage tab
Create the new storage pool
1. Start the Wizard
  Press the + button (the add pool button). The Add a New Storage Pool wizard appears.
  Choose a Name for the storage pool. We use guest_images_lvm for this example. Then change the Type to logical: LVM Volume Group, and
  
  View larger image
  
  Figure 12.14. Add LVM storage pool
  Press the Forward button to continue.
2. Add a new pool (part 2)
  Change the Target Path field. This example uses /guest_images.
  Now fill in the Target Path and Source Path fields, then tick the Build Pool check box.
  - Use the Target Path field to either select an existing LVM volume group or as the name for a new volume group. The default format is /dev/storage_pool_name.
    This example uses a new volume group named /dev/guest_images_lvm.
  - The Source Path field is optional if an existing LVM volume group is used in the Target Path.
    For new LVM volume groups, input the location of a storage device in the Source Path field. This example uses a blank partition /dev/sdc.
  - The Build Pool check box instructs virt-manager to create a new LVM volume group. If you are using an existing volume group you should not select the Build Pool check box.
    This example is using a blank partition to create a new volume group so the Build Pool check box must be selected.
  View larger image
  
  Figure 12.15. Add target and source
  Verify the details and press the Finish button format the LVM volume group and create the storage pool.
3. Confirm the device to be formatted
  A warning message appears.
  
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  Figure 12.16. Warning message
  Press the Yes button to proceed to erase all data on the storage device and create the storage pool.
Verify the new storage pool
The new storage pool will appear in the list on the left after a few seconds. Verify the details are what you expect, 465.76 GB Free in our example. Also verify the State field reports the new storage pool as Active.
It is generally a good idea to have the Autostart check box enabled, to ensure the storage pool starts automatically with libvirtd.

View larger image

Figure 12.17. Confirm LVM storage pool details
Close the Host Details dialog, as the task is now complete.