Installation guide

Chapter 4. LVM Administration with CLI Commands

Found volume group "new_vg"

Creating new_vg-lvol0

Loading new_vg-lvol0 table

Resuming new_vg-lvol0 (253:2)

Clearing start of logical volume "lvol0"

Creating volume group backup "/etc/lvm/backup/new_vg" (seqno 5).

Logical volume "lvol0" created

You could also have used the -vv, -vvv or the -vvvv argument to display increasingly more details

about the command execution. The -vvvv argument provides the maximum amount of information at

this time. The following example shows only the first few lines of output for the lvcreate command

with the -vvvv argument specified.

# lvcreate -vvvv -L 50MB new_vg

#lvmcmdline.c:913 Processing: lvcreate -vvvv -L 50MB new_vg

#lvmcmdline.c:916 O_DIRECT will be used

#config/config.c:864 Setting global/locking_type to 1

#locking/locking.c:138 File-based locking selected.

#config/config.c:841 Setting global/locking_dir to /var/lock/lvm

#activate/activate.c:358 Getting target version for linear

#ioctl/libdm-iface.c:1569 dm version OF [16384]

#ioctl/libdm-iface.c:1569 dm versions OF [16384]

#activate/activate.c:358 Getting target version for striped

#ioctl/libdm-iface.c:1569 dm versions OF [16384]

#config/config.c:864 Setting activation/mirror_region_size to 512

...

You can display help for any of the LVM CLI commands with the --help argument of the command.

# commandname --help

To display the man page for a command, execute the man command:

# man commandname

The man lvm command provides general online information about LVM.

All LVM objects are referenced internally by a UUID, which is assigned when you create the object.

This can be useful in a situation where you remove a physical volume called /dev/sdf which is part

of a volume group and, when you plug it back in, you find that it is now /dev/sdk. LVM will still find

the physical volume because it identifies the physical volume by its UUID and not its device name.

For information on specifying the UUID of a physical volume when creating a physical volume, see

Section 6.4, “Recovering Physical Volume Metadata”.

4.2. Physical Volume Administration

This section describes the commands that perform the various aspects of physical volume

administration.

4.2.1. Creating Physical Volumes