10-17-2002
There's gotta be some confusion here...
On HP-UX, 4 MB is the default extent size for LVM. LVM takes a collection of physical disks and carves them up into usuable disk sections.
When you're actually using the disk sections, the LVM extent size is invisible to you. You can use these disk sections for swap areas, dump areas, raw database sections and even filesystems.
And if you wanted, you can bypass LVM and use disk directly for any of these things. If you did that, you would not even have an LVM extent size.
The Veritas filesystem also has a notion of extents but 4 MB is impossibly large for that.
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LEARN ABOUT MOJAVE
pvchange
PVCHANGE(8) System Manager's Manual PVCHANGE(8)
NAME
pvchange - change attributes of a physical volume
SYNOPSIS
pvchange [--addtag Tag] [-A|--autobackup y|n] [-d|--debug] [-f|--force] [--deltag Tag] [--metadataignore y|n] [-h|-?|--help] [-t|--test]
[-v|--verbose] [-a|--all] [-x|--allocatable y|n] [-u|--uuid] [PhysicalVolumePath...]
DESCRIPTION
pvchange allows you to change the allocation permissions of one or more physical volumes.
OPTIONS
See lvm for common options.
-a, --all
If PhysicalVolumePath is not specified on the command line all physical volumes are searched for and used.
--metadataignore y|n
Ignore or un-ignore metadata areas on this physical volume. If metadata areas on a physical volume are ignored, LVM will not not
store metadata in the metadata areas present on this Physical Volume.
-u, --uuid
Generate new random UUID for specified physical volumes.
-x, --allocatable y|n
Enable or disable allocation of physical extents on this physical volume.
Example
"pvchange -x n /dev/sdk1" disallows the allocation of physical extents on this physical volume (possibly because of disk errors, or because
it will be removed after freeing it.
SEE ALSO
lvm(8), pvcreate(8)
Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) PVCHANGE(8)