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156 Chapter 7
Recovering from failures
Abnormal system shutdowns
CLASS PAGES INCLUDED IN DUMP DESCRIPTION
-------- ---------- ---------------- -------------------------------------
UNUSED 2036 no, by default unused pages
USERPG 6984 no, by default user process pages
BCACHE 15884 no, by default buffer cache pages
KCODE 1656 no, by default kernel code pages
USTACK 153 yes, by default user process stacks
FSDATA 133 yes, by default file system metadata
KDDATA 2860 yes, by default kernel dynamic data
KSDATA 3062 yes, by default kernel static data
Total pages on system: 32768
Total pages included in dump: 6208
DEVICE OFFSET(kB) SIZE (kB) LOGICAL VOL. NAME
------------ ---------- ---------- ------------ -------------------------
31:0x00d000 52064 262144 64:0x000002 /dev/vg00/lvol2
----------
262144
Step 2. Multiply the number of pages listed in “Total pages included in
dump” by the page size (4-Kbytes) and add 25% for a margin of safety. In
the above example, the calculation would be:
(6208 x 4 Kbytes) x 1.25 = approx. 30 Mbytes
Kernel dump device definitions
Capturing dumps for crashes that occur during early stages of the boot
process requires sufficient dump space in the kernel configuration.
Using SAM to configure dump devices into the kernel
The easiest way to configure dump devices is to use SAM. A screen for
dump device definition is located in the Kernel Configuration area. After
changing the dump device definitions, a new kernel must be built and
the system rebooted using the new kernel file to make the changes take
effect. To configure dump devices into the kernel, perform the following
procedure:
Step 1. Run SAM and select the Kernel Configuration Area
Step 2. From the Kernel Configuration Area, select the Dump Devices area
A list of dump devices configured into the next kernel built by SAM is
displayed. This is the list of pending dump devices.