HP-UX System Administrator's Guide: Logical Volume Management (762803-001, March 2014)

Table 5 Volume Group Management Commands (continued)

CommandTask

lvmpudHandling online shared LVM reconfiguration, and pre-allocation of extents

for space-efficient snapshots

vgversionMigrating a volume group to a different volume group version

vgmoveMigrating a volume group to new disks

To convert the cDSFs of a volume group in a particular node back to their corresponding persistent DSFs, use the

vgscan -f command. For example:

# vgscan -f vgtest

*** LVMTAB has been updated successfully.

Repeat the above command on all the nodes in the cluster where this shared volume group is present (i.e., imported).

Use the lvmadm -l command to verify the conversion of cDSFs to persistent DSF.

Table 6 Logical Volume Management Commands

CommandTask

lvcreateCreating a logical volume

lvchangeModifying a logical volume

lvdisplayDisplaying information about logical volumes

lvextendIncreasing the size of a logical volume by allocating disk space

lvmoveMigrating a logical volume to new disks

lvreduceDecreasing the size of a logical volume

lvremoveRemoving the allocation of disk space for one or more logical volumes within a volume

group

lvlnboot

Preparing a logical volume to be a root, primary swap, or dump volume; updating the

boot information on the boot physical volume

lvrmboot

Removing the link that makes a logical volume a root, primary swap, or dump volume

lvsplitSplitting a mirrored logical volume into two logical volumes

lvmergeMerging two logical volumes into one mirrored logical volume

lvsyncSynchronizing mirror copies in a mirrored logical volume

The lvlnboot and lvrmboot commands are not supported on Version 2.0 and 2.1 volume groups.

The command-line interface is more powerful—and thus more dangerous—than HP SMH and

offers options that are not available using HP SMH. For example, the following tasks cannot

currently be done by HP SMH. For these tasks, use the HP-UX commands:

◦ “Creating a Spare Disk” (page 79)

◦ “Reinstating a Spare Disk” (page 80)

◦ “Synchronizing a Mirrored Logical Volume” (page 29)

◦ “Moving Data to a Different Physical Volume” (page 76)

◦ “Disk Troubleshooting and Recovery Procedures” (page 124)

The remainder of this chapter explains how to do LVM tasks using HP-UX commands. However,

HP SMH is the tool of choice for most administration work.

3.1 Administration Tools 43