前些日子,备份的代理服务器连续宕机,在/var/crash/ns/生成了四组之多的dump文件,本想找一些文章看看,为什么系统频繁crash。找到这篇文章,还没来得及看,又完了,彻底完了--硬盘坏了,:(。
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Crash Dump Analysis on Solaris
1、Introduction
This document attempts to provide a high-level introduction to handling basic crash dump analysis on Sun servers. A sample procedure is included which can be adopted to any organization for uniform handling of Sun server crashes. The term 'Crash Dump Analysis' may be a bit misleading in the context of this document. Coverage of actual analysis of the system crash dump using a debugger is not covered--Sun has an excellent instructor-led training class on this topic. Most System Administrators at most organizations will never have to use a debugger on a crash dump--this is typically a service provided by Sun with a service contract. In light of this, this document covers introductory materials regarding server crashes and preparing the necessary information to present to Sun when a service call is opened.
2、What Happens After a Crash?
When a panic occurs on a Solaris system, a message describing the error is usually echoed to the system console. The system will then attempt to write out the contents of the physical memory to a predetermined dump device, which is usually a dedicated disk partition, or the system swap partition. Once this is completed, the system is then rebooted.
Once the system begins rebooting, a startup script will call the savecore utility, if enabled. This command will perform a few tasks on the memory dump. First it will check to make sure that the crash dump corresponds to the running operating system. If the dump passes this test, savecore will then begin to copy the crash dump from the dedicated dump device to the directory /var/crash/`uname -n', or some other predetermined device. The dump is written out to two files, unix.n and vmcore.n, where n is an sequential integer identifying this particular crash. Finally, savecore logs a reboot using the LOG_AUTH syslog facility.
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