12-10-2003
Confused with File System Concepts
Hello,
I've been reading the AIX 5.1 System Concepts PDF but I'm still confused about some file-system concepts and their relationships.
What is the 'allocation group size'?
How are 'disk allocation unit'/'fragment size', NBPI and 'allocation group size'?
And how are the above three concepts realted logical parition size?
Thanks
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LEARN ABOUT DEBIAN
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)