The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
Having initialized the physical volumes, you can add them to a new or existing volume group.
To create a volume group, use the vgcreate command:
#vgcreate
[options
]volume_group
physical_volume
...
For example, create the volume group myvg
from the physical volumes /dev/sdb
,
/dev/sdc
, /dev/sdd
, and
/dev/sde
:
# vgcreate -v myvg /dev/sd[bcde]
Wiping cache of LVM-capable devices
Adding physical volume ‘/dev/sdb’ to volume group ‘myvg’
Adding physical volume ‘/dev/sdc’ to volume group ‘myvg’
Adding physical volume ‘/dev/sdd’ to volume group ‘myvg’
Adding physical volume ‘/dev/sde’ to volume group ‘myvg’
Archiving volume group “myvg” metadata (seqno 0).
Creating volume group backup “/etc/lvm/backup/myvg” (seqno 1).
Volume group “myvg” successfully created
LVM divides the storage space within a volume group into physical extents, which are the smallest unit that LVM uses when allocating storage to logical volumes. The default size of an extent is 4 MB.
The allocation policy for the volume group
and logical volume determines how LVM allocates extents from a
volume group. The default allocation policy for a volume group
is normal
, which applies rules such as not
placing parallel stripes on the same physical volume. The
default allocation policy for a logical volume is
inherit
, which means that the logical volume
uses the same policy as for the volume group. You can change the
default allocation policies by using the
lvchange or vgchange
commands, or you can override the allocation policy when you
create a volume group or logical volume. Other allocation
policies include anywhere
,
contiguous
and cling
.
To add physical volumes to a volume group, use the vgextend command:
#vgextend
[options
]volume_group
physical_volume
...
To remove physical volumes from a volume group, use the vgreduce command:
#vgreduce
[options
]volume_group
physical_volume
...
To display information about volume groups, you can use the vgdisplay, vgs, and vgscan commands.
To remove a volume group from LVM, use the vgremove command:
#vgremove
volume_group
Other commands that are available for managing volume groups include vgchange, vgck, vgexport, vgimport, vgmerge, vgrename, and vgsplit.
For more information, see the lvm(8)
,
vgcreate(8)
, and other LVM manual pages.