Table of Contents
System messages display on the console device. The text of most system messages look like this:
[ID msgid facility.priority]
For example:
[ID 672855 kern.notice] syncing file systems...
If the message originated in the kernel, the kernel module name is displayed. For example:
Oct 1 14:07:24 mars ufs: [ID 845546 kern.notice] alloc: /: file system full
When a system crashes, it might display a message on the system console like this:
panic: error message
Less frequently, this message might be displayed instead of the panic message:
Watchdog reset !
The error logging daemon, syslogd, automatically records
various system warnings and errors in message files. By default, many of these system
messages are displayed on the system console and are stored in the /var/adm directory. You can direct where these messages are stored by setting up
system message logging. For more information, see Customizing System Message Logging. These messages can alert you to system problems, such
as a device that is about to fail.
The /var/adm directory contains several message files.
The most recent messages are in /var/adm/messages file (and in messages.*), and the oldest are in the messages.3 file.
After a period of time (usually every ten days), a new messages file
is created. The messages.0 file is renamed messages.1, messages.1 is renamed messages.2,
and messages.2 is renamed messages.3. The
current /var/adm/messages.3 file is deleted.
Because the /var/adm directory stores large files
containing messages, crash dumps, and other data, this directory can consume lots
of disk space. To keep the /var/adm directory from growing too
large, and to ensure that future crash dumps can be saved, you should remove unneeded
files periodically. You can automate this task by using the crontab file.
For more information on automating this task, see How to Delete Crash Dump Files and Chapter 15, Scheduling System Tasks (Tasks).
How to View System Messages
Display recent messages generated by a system crash or reboot by using the dmesg command.
$ dmesg
Or, use the more command to display one screen of messages at a time.
$ more /var/adm/messages
Example 22.1. Viewing System Messages
The following example shows output from the dmesg command.
$ dmesg
Jan 3 08:44:41 starbug genunix: [ID 540533 kern.notice] SunOS Release 5.10 ...
Jan 3 08:44:41 starbug genunix: [ID 913631 kern.notice] Copyright 1983-2003 ...
Jan 3 08:44:41 starbug genunix: [ID 678236 kern.info] Ethernet address ...
Jan 3 08:44:41 starbug unix: [ID 389951 kern.info] mem = 131072K (0x8000000)
Jan 3 08:44:41 starbug unix: [ID 930857 kern.info] avail mem = 121888768
Jan 3 08:44:41 starbug rootnex: [ID 466748 kern.info] root nexus = Sun Ultra 5/
10 UPA/PCI (UltraSPARC-IIi 333MHz)
Jan 3 08:44:41 starbug rootnex: [ID 349649 kern.info] pcipsy0 at root: UPA 0x1f0x0
Jan 3 08:44:41 starbug genunix: [ID 936769 kern.info] pcipsy0 is /pci@1f,0
Jan 3 08:44:41 starbug pcipsy: [ID 370704 kern.info] PCI-device: pci@1,1, simba0
Jan 3 08:44:41 starbug genunix: [ID 936769 kern.info] simba0 is /pci@1f,0/pci@1,1
Jan 3 08:44:41 starbug pcipsy: [ID 370704 kern.info] PCI-device: pci@1, simba1
Jan 3 08:44:41 starbug genunix: [ID 936769 kern.info] simba1 is /pci@1f,0/pci@1
Jan 3 08:44:57 starbug simba: [ID 370704 kern.info] PCI-device: ide@3, uata0
Jan 3 08:44:57 starbug genunix: [ID 936769 kern.info] uata0 is /pci@1f,0/pci@1,
1/ide@3
Jan 3 08:44:57 starbug uata: [ID 114370 kern.info] dad0 at pci1095,6460
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