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Full Discussion: Organization in a big file system
Operating Systems AIX Organization in a big file system Post 100433 by Garry_Garrett on Monday 27th of February 2006 12:51:59 PM
Old 02-27-2006
If you cannot have your DBAs shutdown the database for the duration of your backup, perhaps they can put it into "hot backup mode"? This puts changes into separate files so that you can get a consistant backup of the 6 files oracle uses. You can't backup a "live" oracle database because if these 6 files aren't consistant, oracle won't touch them.

There is something about "PP size". I've yet to see this explained very well (I'm more of a Solaris guy). Essentially, you can only extend a filesystem so far. If you know you're going to expand a given filesystem, you can go in and mess with the numbers (when you build the filesystem) and make them big enough to expand things down the road (and what exactly this costs you; why you wouldn't just do this all the time, I don't have a clear understanding of either). If you just accept the defaults, then at some point, if you expand and expand and expand, you'll eventually reach a point where you can't expand anymore (something runs out of fingers and toes to count on). Whereas if you build a new filesystem from scratch, and you make it big, the defaults will bump up to some bigger numbers.

Sorry I don't have a better explaination; I don't understand it well myself. Perhaps someone who does understand all this can explain it better. I'm just thinking that perhaps this is what IBM is talking about.

Of course, you can call IBM back and ask them to explain it to you...

PS: It is my understand that a JFS2 filesystem doesn't have all this. I don't know when they added JFS2 or if that is an option for you.
 

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LEARN ABOUT XFREE86

backup_help

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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