System crashes can occur due to hardware malfunctions, I/O problems, and software errors. If the system crashes, it will display an error message on the console, and then write a copy of its physical memory to the dump device. The system will then reboot automatically. When the system reboots, the savecore command is executed to retrieve the data from the dump device and write the saved crash dump to your savecore directory. The saved crash dump files provide invaluable information to your support provider to aid in diagnosing the problem.
Solaris Express 6/05: If a system crash occurs on an x86
based system in the GRUB boot environment, it is possible that the SMF service that
manages the GRUB boot archive, svc:/system/boot-archive:default, might
fail on the next system reboot. To troubleshoot this type of problem, see
What to Do if the SMF Boot Archive Service Fails During a System Reboot. For
more information on GRUB based booting, see Chapter 11, GRUB Based Booting (Tasks), in System Administration Guide: Basic Administration
.
The savecore command runs automatically after a system crash
to retrieve the crash dump information from the dump device and writes a pair of files
called unix.X and vmcore.X, where X identifies
the dump sequence number. Together, these files represent the saved system crash dump
information.
Crash dump files are sometimes confused with core files, which are images of user applications that are written when the application terminates abnormally.
Crash dump files are saved in a predetermined directory, which by default,
is /var/crash/
hostname. In previous
Solaris releases, crash dump files were overwritten when a system rebooted, unless
you manually enabled the system to save the images of physical memory in a crash dump
file. Now, the saving of crash dump files is enabled by default.
System crash information is managed with the dumpadm command. For more information, see The dumpadm Command.
You can examine the control structures, active tables, memory images of a live or crashed system kernel, and other information about the operation of the kernel by using the mdb utility. Using mdb to its full potential requires a detailed knowledge of the kernel, and is beyond the scope of this manual. For information on using this utility, see the mdb ( 1 ) man page.
Additionally, crash dumps saved by savecore can be useful to send to a customer service representative for analysis of why the system is crashing.
Use the dumpadm command to manage system crash dump information in the Solaris Operating System.
The dumpadm command enables you to configure crash dumps of the operating system. The dumpadm configuration parameters include the dump content, dump device, and the directory in which crash dump files are saved.
Dump data is stored in compressed format on the dump device. Kernel crash dump images can be as big as 4 Gbytes or more. Compressing the data means faster dumping and less disk space needed for the dump device.
Saving crash dump files is run in the background when a dedicated dump device, not the swap area, is part of the dump configuration. This means a booting system does not wait for the savecore command to complete before going to the next step. On large memory systems, the system can be available before savecore completes.
System crash dump files, generated by the savecore command, are saved by default.
The savecore -L command is a new feature which enables you to get a crash dump of the live running the Solaris OS. This command is intended for troubleshooting a running system by taking a snapshot of memory during some bad state, such as a transient performance problem or service outage. If the system is up and you can still run some commands, you can execute the savecore -L command to save a snapshot of the system to the dump device, and then immediately write out the crash dump files to your savecore directory. Because the system is still running, you can only use the savecore -L command if you have configured a dedicated dump device.
The following table describes dumpadm's configuration parameters.
|
Dump Parameter |
Description |
|---|---|
|
dump device |
The device that stores dump data temporarily as the system crashes. When the dump device is not the swap area, savecore runs in the background, which speeds up the boot process. |
|
savecore directory |
The directory that stores system crash dump files. |
|
dump content |
Type of memory data to dump. |
|
minimum free space |
Minimum amount of free space required in the savecore directory after saving crash dump files. If no minimum free space has been configured, the default is one Mbyte. |
For more information, see dumpadm ( 1M ) .
The dump configuration parameters managed by the dumpadm command
are stored in the /etc/dumpadm.conf file.
Do not edit the /etc/dumpadm.conf file manually.
Editing this file manually could result in an inconsistent system dump configuration.
During system startup, the dumpadm command is invoked by
the svc:/system/dumpadm:default service to configure crash dumps
parameters based on information in the /etc/dumpadm.conf file.
Specifically, dumpadm initializes the dump device and the
dump content through the /dev/dump interface.
After the dump configuration is complete, the savecore script
looks for the location of the crash dump file directory by parsing the content of /etc/dumpadm.conf file. Then, savecore is invoked
to check for crash dumps and check the content of the minfree file
in the crash dump directory.
Do not configure a dedicated dump device that is under the control of volume management product such as Solaris Volume Manager for accessibility and performance reasons. You can keep your swap areas under the control of Solaris Volume Manager and this is a recommend practice, but keep your dump device separate.