Red Hat APPLICATION STACK 1.1 RELEASE Manuale Utente Scaricare il pdf (Pagina 16)

Chapter 1: Software Overview

Crash Functionality

The following changes have been made to the Linux crash utility, which are explained

brieﬂy below. General information aboutlcrash can be found in thecmd/lcrash/README

ﬁle.

• Linux kernel crash dump enhancements. SGI Linux 1.1 provides a new

conﬁguration option to allow kernel crash dumps to be available. This option is

conﬁgured to be on by default, and the default dump space is the ﬁrst swap

partition found when booting. If you are building a new kernel, you can specify

Support kernel crashdump capabilitiesin the KernelHacking sectionof make xconfig.

The crash dump capabilities in the kernel allow the system to create a crash dump

when a failure occurs due to a panic() call or an exception. For more details on the

dump method, compression used, and so on, please read the LKCD FAQ at the

following URL:

http://oss.sgi.com/projects/lkcd/faq.html.

Information about LKCD is also available in the ﬁle cmd/lcrash/README.lkcd.

• Boot up process changes. As the system boots up, the /sbin/vmdump script will be

run out of /etc/rc.d/rc.sysinit. This script saves crash dumps and reads sysconﬁg

variables to open the dump device and conﬁgure the system for crash dumps.

• Crash dump conﬁguration options. There are a number of conﬁgurable options to

save system crash dumps. Please read /etc/sysconﬁg/vmdump for more details on the

options available. The following list describes what the options allow you to do:

– Determine if you want to implement crash dumps in the kernel

– Choose whether to save crash dumps to disk or not

– Change the location to which the crash dumps are saved

– Specify any block dump device you want

– Compress (or not compress) the crash dumps

– Conﬁgure the system to reset (or not reset) after a failure

• The lcrash utility now uses the new librl library for command line input.

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Red Hat APPLICATION STACK 1.1 RELEASE Manuale Utente Pagina 16