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Top Forums UNIX for Dummies Questions & Answers How to create a volume group, logical volume group and file system? Post 302770041 by zaxxon on Thursday 14th of February 2013 08:57:17 AM
Old 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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BACKUP_HELP(8)						       AFS Command Reference						    BACKUP_HELP(8)

NAME
backup_help - Displays help for backup commands SYNOPSIS
backup help [-topic <help string>+] [-admin] [-help] backup h [-t <help string>+] [-a] [-h] DESCRIPTION
The backup help command displays the complete online help entry (short description and syntax statement) for each operation code specified by the -topic argument. If the -topic argument is omitted, the output includes the first line (name and short description) of the online help entry for every backup command. To list every backup command whose name or short description includes a specified keyword, use the backup apropos command. OPTIONS
-topic <help string>+ Indicates each command for which to display the complete online help entry. Omit the backup part of the command name, providing only the operation code (for example, specify dump, not backup dump). If this argument is omitted, the output briefly describes every backup command. -help Prints the online help for this command. All other valid options are ignored. OUTPUT
The online help entry for each backup command consists of the following two or three lines: o The first line names the command and briefly describes its function. o The second line lists aliases for the command, if any. o The final line, which begins with the string "Usage", lists the command's options in the prescribed order. Online help entries use the same symbols (for example, brackets) as the reference pages in this document. EXAMPLES
The following example displays the online help entry for the backup dump command: % backup help dump backup dump: start dump Usage: backup dump -volumeset <volume set name> -dump <dump level name> [-portoffset <TC port offset>] [-at <Date/time to start dump>+] [-append] [-n] [-file <load file>] [-help] PRIVILEGE REQUIRED
None SEE ALSO
backup(8), backup_apropos(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_HELP(8)
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