11-15-2002
With physical partitions, a disk is subdivided into partitions. And somehow the disk driver knows about the subdivision scheme. The driver may read a table off the first sector of the disk. Or the driver may just get the model number of the drive and pick a built-in table. The special files are named to indicate the section. c0t0d0s2 would be section "2" of the disk (which was always the whole thing).
With logical volumes, a disk like c0t0d0s2 (or maybe just c0t0d0 theses days) is just a physical volume which gets tossed into a pool called a volume group. Then you have very great flexibility in creating logical volumes. A logical volume may be a very small slice of a disk. Or it may be so large that it is several disk drives.
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Hi Everyone,
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hello
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LEARN ABOUT NETBSD
pvdisplay
PVDISPLAY(8) System Manager's Manual PVDISPLAY(8)
NAME
pvdisplay - display attributes of a physical volume
SYNOPSIS
pvdisplay [-c|--colon] [-d|--debug] [-h|-?|--help] [-s|--short] [-v[v]|--verbose [--verbose]] PhysicalVolumePath [PhysicalVolumePath...]
DESCRIPTION
pvdisplay allows you to see the attributes of one or more physical volumes like size, physical extent size, space used for the volume group
descriptor area and so on.
pvs (8) is an alternative that provides the same information in the style of ps (1).
OPTIONS
See lvm for common options.
-c, --colon
Generate colon separated output for easier parsing in scripts or programs. N.B. pvs (8) provides considerably more control over the
output.
The values are:
* physical volume device name
* volume group name
* physical volume size in kilobytes
* internal physical volume number (obsolete)
* physical volume status
* physical volume (not) allocatable
* current number of logical volumes on this physical volume
* physical extent size in kilobytes
* total number of physical extents
* free number of physical extents
* allocated number of physical extents
-s, --short
Only display the size of the given physical volumes.
-m, --maps
Display the mapping of physical extents to logical volumes and logical extents.
SEE ALSO
lvm(8), pvcreate(8), lvcreate(8), vgcreate(8)
Sistina Software UK LVM TOOLS 2.02.44-cvs (02-17-09) PVDISPLAY(8)