AIX 5L Problem Determination - IBM Redbooks

home: blocks in use: 0, limits (soft = 100, hard = 250)
inodes in use: 0, limits (soft = 200, hard = 250)
~
~
5. To enable the quota system with the quotaon command, enter:
# quotaon -u /home
6. Use the quotacheck command to check the consistency of the quota files
against actual disk usage:
# quotacheck /home
7.5 Paging space
On AIX systems, the following list indicates possible problems associated with
paging space:
► All paging spaces defined on one physical volume
► Page space nearly full
► Imbalance in allocation of paging space on physical volumes
► Fragmentation of a paging space in a volume group
7.5.1 Recommendations for creating or enlarging paging space
Do not put more than one paging space logical volume on a physical volume.
All processes started during the boot process are allocated paging space on the
default paging space logical volume (hd6). After the additional paging space
logical volumes are activated, paging space is allocated in a round robin manner
in 4-KB units. If you have paging space on multiple physical volumes and put
more than one paging space on one physical volume, you are no longer
spreading paging activity over multiple physical volumes.
Avoid putting a paging space logical volume on the same physical volume as a
heavily active logical volume, such as that used by a database.
It is not necessary to put a paging space logical volume on each physical
volume.
Make each paging space logical volume roughly equal in size. If you have paging
spaces of different sizes and the smaller ones become full, you will no longer be
spreading your paging activity across all of the physical volumes.
166 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques