AIX 5L Problem Determination - IBM Redbooks

5.2 Starting a system dump
A user-initiated dump is different from a dump initiated by an unexpected system
halt because the user can designate which dump device to use. When the
system halts unexpectedly, a system dump is automatically initiated to the
primary dump device. Do not start a system dump if the flashing 888 number
shows in your operator panel display. This number indicates that your system
has already created a system dump and written the information to your primary
dump device. If you start your own dump before copying the information in your
dump device, your new dump will overwrite the existing information.
You can start a system dump by using one of the methods listed below.
If you have the Software Service Aids Package installed, you have access to the
sysdumpstart command and can start a dump using one of these methods:
► Use the command line.
► Use SMIT.
If you do not have the Software Services Aids Package installed, you must use
one of these methods to start a dump:
► Use the Reset button.
► Use special key sequences.
5.2.1 Using the command line
To create a system dump, use the following steps to choose a dump device,
initiate the system dump, and determine the status of the system dump.
Check which dump device is appropriate for your system (the primary or
secondary device) by using the following sysdumpdev command:
# sysdumpdev -l
primary /dev/hd6
secondary /dev/sysdumpnull
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression OFF
This command lists the current dump devices. You can use the sysdumpdev
command to change device assignments.
Start the system dump by entering the following sysdumpstart command:
# sysdumpstart -p
68 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques