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Core Dump and Crash Dump Solaris

Crash Dump : When an operating system 
or system hardware has an error (fatal)
system generates crash dump.


Core Dump : When any user process or
application has an error system
generates core dump.


Note: When an operating system crashes,
the save core command runs
automatically during the first boot.
This command retrieves the crash dump
from the dump device
[by default partition] and then writes
crash dump to the file at the following 
location i-e 
/var/crash/hostname/file

Crash Dump saves Kernel core information
in the below mentioned file i-e
/var/crash/hostname/vmcore.x

and it saves name list information along
with symbolic information in the 
below file i-e
/var/crash/hostname/unix.x


Note: Within the crash dump directory
file named as "Bounds" is created 
automatically when dumping happens 
for the first time. This file holds a number
that is used as suffix for the next dump 
to be set.This dump is used by root
administrator for system problem 
analysis.

To view crash dump Configuration 
we use command :

#dumpadm

This command reads the statement
from /etc/dumpadm.conf file and
displays output.

To configure/modify the crash dump 
configuration we use command:

#dumpadm -c -all -d /dev/dsk/c0t0d0s1


-c : to specify type of data
-d : to specify device that stores dump data as 
     the system crashes.

dsk : swap block device

Note: If SVM is configured in swap then :
/dev/md/dsk/d0


To generate Crash Dump manually
use the command :

#savecore -L /var/crash/hostanme

To view Core dump configuration
use command : 

#Coreadm
It reads /etc/coreadm.conf and 
displays output.       

To disable and enable core dump settings : 

#dumpadm -n 

and 

#dumpadm -y

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