System Management Guide: Operating System and Devices

Managing Logical Volume Storage

The following tables show many tasks that help manage logical volume storage. The tables group tasks by those that primarily affect logical and physical volumes and those that primarily affect file systems. More complicated tasks are described in subsequent sections of this chapter.

Perform the following tasks to manage users and groups. You must have root authority to perform many of these tasks.

Managing Logical Volumes and Storage Tasks
Task	SMIT Fast Path	Command or File
Add a logical volume^Note1	smit mklv
Add a volume group	smit mkvg
Activate a volume group	smit varyonvg
Add and activate a new volume group	smit mkvg
Add fixed disk without data to existing volume group	smit extendvg
Add fixed disk without data to new volume group	smit mkvg
Change name of volume group ^Note2	smit varyoffvg smit exportvg smit importvg smit mountfs	varyoffvg OldVGName exportvg OldVGName importvg NewVGName mount all
Check size of a logical volume	smit lslv
Copy a logical volume to a new logical volume^Note3	smit cplv
Copy a logical volume to an existing logical volume of the same size^Attn1	smit cplv
Copy a logical volume to an existing logical volume of smaller size^Attn1 ,^Note3	Do not use SMIT^Attn2	Create logical volume. For example: mklv -y hdX vg00 4 Create new files system on new logical volume. For example: crfs -v jfs -d hdX -m /doc -A yes Mount file system. For example: mount /doc Create directory at new mount point. For example: mkdir /doc/options Transfer files system from source to destination logical volume. For example: *cp -R /usr/adam/oldoptions/ /doc/options**
Copy a logical volume to an existing logical volume of larger size^Attn1	smit cplv
Deactivate a volume group	smit varyoffvg
Implement mirroring and data allocation	smit mklvcopy
Implement mirroring only	smit mklvcopy
Implement data allocation only	smit chlv1
Implement write-verify and scheduling	smit chlv1
Increase the maximum size of a logical volume	smit chlv1
Increase the size of a logical volume	smit lsvc
List all logical volumes by volume group	smit lslv2
List all physical volumes in system	smit lspv2
List contents of a physical volume	smit lspv
List all volume groups	smit lsvg2
List contents of a volume group	smit lsvg1
Power off a disk	smit offdsk
Power on a removable disk	smit ondsk
Remove a volume group	smit reducevg2
Remove a disk with data from the operating system	smit exportvgrds
Remove a disk without data from the operating system	smit reducevgrds
Reorganize a volume group	smit reorgvg
Set automatic activation for a volume group	smit chvg
Set logical volume policies	smit chlv1
Unconfigure and power off a disk	smit rmvdsk1 or smit rmvdsk then smit opendoor

Attention:

Using this procedure to copy to an existing logical volume will overwrite any data on that volume without requesting user confirmation.
Do not use the SMIT procedure or the cplv command to copy a larger logical volume to a smaller one. Doing so results in a corrupted file system because some of the data (including the superblock) is not copied to the smaller logical volume.

Notes:

After you create a logical volume, the state will be closed. This means that no LVM structure is using that logical volume. It will remain closed until a file system has been mounted over the logical volume or the logical volume is opened for raw I/O. See also Defining a Raw Logical Volume for an Application .
You cannot change the name of, import, or export rootvg.
You must have enough direct access storage to duplicate a specific logical volume.

Perform the following tasks to manage logical volumes and file systems. You must have root authority to perform many of these tasks.

Managing Logical Volumes and File Systems Tasks
Task	SMIT Fast Path	Command or File
Add a journaled file system (JFS) to a previously defined logical volume menu	Create logical volume, then smit crjfslv
Check size of a file system	smit fs
Increase size of a file system	smit chjfs
Listing all file systems on a disk	smit lsmntdsk
Unmount file systems on a disk	smit unmntdsk