02-14-2013
I assume you are talking about AIX LVM?
If this is the case, you should have a look in here:
IBM Info Center
The maximum number of Physical Partitions (PP) per Physical Volume (PV) is 1016. So if your 200 GB belong to one PV, you should have at least a PP size of 256 MB to use all space on it. You can do the maths yourself.
In short, the concept is:
PV --- VG (parted into PPs) --- LV (related to LP) --- FS
PPs are related with LPs. When you have a mirrored LV for example, you usually have 2 PPs that backup 1 LP. Best choice is to have both PPs on different PVs of course.
- A PV can be any kind of disk, local, SAN LUN, whatever.
- A PV can not belong to more than one VG.
- A VG can have more than one PV but at least 1.
- A VG can have more than one LV.
- A FS needs a LV beneath. A FS is related 1:1 with a LV
- There are types of LVs that do not need a FS on top, like Raw-LVs etc.
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LEARN ABOUT CENTOS
backup_apropos
BACKUP_APROPOS(8) AFS Command Reference BACKUP_APROPOS(8)
NAME
backup_apropos - Displays each help entry containing a keyword string
SYNOPSIS
backup apropos -topic <help string> [-help]
backup ap -t <help string> [-h]
DESCRIPTION
The backup apropos command displays the first line of the online help entry for any backup command that has in its name or short
description the string specified by the -topic argument.
To display the syntax for a command, use the backup help command.
OPTIONS
-topic <help string>
Specifies the keyword string to match, in lowercase letters only. If the string is more than a single word, surround it with double
quotes (" ") or other delimiters.
-help
Prints the online help for this command. All other valid options are ignored.
OUTPUT
The first line of a command's online help entry names it and briefly describes its function. This command displays the first line for any
backup command where the string specified with the -topic argument is part of the command name or first line.
EXAMPLES
The following example lists all backup commands that include the word "tape" in their names or short descriptions:
% backup apropos tape
labeltape: label a tape
readlabel: read the label on tape
scantape: dump information recovery from tape
status: get tape coordinator status
PRIVILEGE REQUIRED
None
SEE ALSO
backup(8), backup_help(8)
COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas
Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
OpenAFS 2012-03-26 BACKUP_APROPOS(8)