Content-type: text/html Man page of balance

balance

Section: Maintenance Commands (8)
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NAME

balance - Balances the percentage of used space among volumes in a domain.  

SYNOPSIS

/usr/sbin/balance [-v] domain

Specifies the name of the file domain.  

FLAGS

Displays information on which files are being moved to different volumes. Selecting this flag slows down the balance procedure.  

DESCRIPTION

The balance utility evenly distributes the percentage of used space between volumes in a multivolume domain. This improves performance and evens the distribution of future file allocations.

Use the showfdmn command to determine the percentage of used space on each volume. This information allows you to determine the need to balance the volumes.

The balance utility can be used at any time, but it is particularly useful after adding or removing a volume (addvol, rmvol) because these procedures can cause file distribution to become uneven.

When you plan to run both the defragment and balance utilities on the same domain, run the defragment utility before running the balance utility. The defragment utility often improves the balance of free space, thus enabling the balance utility to run more quickly.

Before you can balance volumes in a file domain, all filesets in the file domain must be mounted. If you try to balance volumes in an active file domain that includes unmounted filesets, the system displays an error message indicating that a fileset is unmounted.  

RESTRICTIONS

You must have root privilege to access this utility. Additionally, you must register the Advanced File System Advanced Utilities license to use this utility.

You cannot run the balance utility while the addvol, rmvol, defragment, rmfset, or balance utility is running on the same file domain. If you attempt to do this, a warning message is displayed.  

EXAMPLES

The following example shows the procedure for determining the percentage of used space on each volume of the two-volume usr_domain file domain and then redistributing the files to balance the percentage of used space. The final showfdmn command shows the redistributed percentage of used space.

# showfdmn usr_domain Id Date Created LogPgs Domain Name 2dcab512.000d1ed0 Fri May 6 14:22:26 1994 512 usr_domain


  Vol   512-Blks        Free  % Used  Cmode  Rblks  Wblks  Vol Name
   1L     819200      126848     85%     on    128    128  /dev/rz8g
   2      768281      768080      0%     on    128    128  /dev/rz9d
      ----------  ----------  ------
         1587481      894928     44% # balance usr_domain balance: Balancing domain 'usr_domain' balance: Balanced domain 'usr_domain' # showfdmn usr_domain
                Id              Date Created  LogPgs  Domain Name 2dcab512.000d1ed0 Fri May 6 14:22:26 1994 512 usr_domain                         
Vol 512-Blks Free % Used Cmode Rblks Wblks Vol Name
 1L     819200      459248     44%     on    128    128  /dev/rz8g
 2      768281      433632     44%     on    128    128  /dev/rz9d
    ----------  ----------  ------
       1587481      892880     44%

The files are now distributed more evenly between the two volumes.  

RELATED INFORMATION

addvol(8), defragment(8), rmvol(8), showfdmn(8).


 

Index

NAME
SYNOPSIS
FLAGS
DESCRIPTION
RESTRICTIONS
EXAMPLES
RELATED INFORMATION

This document was created by man2html, using the manual pages.
Time: 02:40:31 GMT, October 02, 2010