Linux system Suspension

Linux system suspension-general Linux technology-Linux programming and kernel information. The following is a detailed description. 1. kernel CRASH information collection:
# Rpm-ivh lkcdutils-4.2-193.68.rpm
# Insserv-v/etc/init. d/boot. lkcd, start = 3, 5
# The following lines in the file/etc/rc. d/boot. swap:
Echo "Activating remaining swap-devices in/etc/fstab ..."
Add the following line before:
/Sbin/lkcd save
Delete the line "/sbin/rc. d/boot. lkcd save" in/etc/rc. d/boot. lkcd.
# Cat/etc/sysconfig/dump
DUMP_ACTIVE = "1"
DUMPDEV = "/dev/cciss/c0d0p1" # Use the swap Zone
DUMPDIR = "/var/log/dump"
DUMP_LEVEL = "4"
DUMP_COMPRESS = "2"
DUMP_FLAGS = "0x80000000"
DUMP_SAVE = "1"
PANIC_TIMEOUT = "5"
BOUNDS_LIMIT = 3
KEXEC_IMAGE =/boot/vmlinuz

# Cat/etc/sysconfig/sysctl
........
ENABLE_SYSRQ = "yes"
Restart the machine. If you do not want to restart the machine, run the following two commands:
#/Sbin/lkcd config
# Echo 1>/proc/sys/kernel/sysrq
# Cat/proc/interrupts check whether the NMI count has changed (more than 100 times per second). If yes, NMI_watchdog is enabled. Otherwise, add nmi_watchdog = 1 to/boot/grub/menu. lst and restart the machine.
# Ls-d/proc/sys/kernel/dump/-- if the kernel does not exist, the kernel does not support lkcd.
2. test:
#/Sbin/lkcd dump
Or:
# Echo d>/proc/sysrq-trigger
Or
Uninstall unnecessary file systems. Go to the console and issue the following command:
Alt-SysRq-u -- all file systems are mounted in read-only mode
Alt-SysRq-c -- crash Kernel
#/Sbin/lkcd save -- test the content on the dump Device
3. verify the validity:
# Cd/var/log/dump/x --- enter the directory of the nth dump
#/Sbin/lcrash-n x
> Ps --- display the dump Process
> Trace
> Q