Compressed Dump

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Compressed Dump White Paper, Version 1.3

page 2

Compressed Dump conﬁgured by using the dump conﬁguration utility, crashconf. The new option, -c can

be used to turn compression ON or OFF as follows.

$ crashconf -c on

$ crashconf -v

CLASS PAGES INCLUDED IN DUMP DESCRIPTION

-------- ---------- ---------------- ---------------------------

UNUSED 362737 no, by default unused pages

USERPG 21306 no, by default user process pages

BCACHE 57265 no, by default buffer cache pages

KCODE 2912 no, by default kernel code pages

USTACK 603 yes, by default user process stacks

FSDATA 34 yes, by default file system metadata

KDDATA 36964 yes, by default kernel dynamic data

KSDATA 28073 yes, by default kernel static data

SUPERPG 14394 no, by default unused kernel super pages

Total pages on system: 524288

Total pages included in dump: 65674

Dump compressed: ON

DEVICE OFFSET(kB) SIZE (kB) LOGICAL VOL. NAME

------------ ---------- ---------- ------------ ---------------

31:0x022000 310368 4194304 4:0x000001 /dev/vg00/lvol2

----------

4194304

Turning compression ON using crashconf, gives a hint to the system to use compression while dumping.

The system may choose to dump uncompressed based on the environment of the crash. To turn compres-

sion OFF,

$ crashconf -v -c off