HP-UX Compressed Dump A.01.01 Release Notes

HP-UX Compressed Dump A.01.01 Release Note
What Is in This Version
Chapter 16
Dump compressed: ON
DEVICE OFFSET(kB) SIZE (kB) LOGICAL VOL. NAME
------------ ---------- ---------- ------------ -----------------
31:0x03a000 310112 4194304 64:0x000002 /dev/vg00/lvol2
----------
4194304
Turning compression option ON using crashconf, gives a hint to the system to use
compression while dumping. The system may choose to take uncompressed dump based on
the environment of the crash.
Compression can be turned OFF using the crashconf -c option as follows:
# crashconf -v -c off
# crashconf -v -c off
CLASS PAGES INCLUDED IN DUMP DESCRIPTION
-------- ---------- ---------------- -----------------------------
UNUSED 3645411 no, by default unused pages
USERPG 7113 no, by default user process pages
BCACHE 210990 no, by default buffer cache pages
KCODE 2670 no, by default kernel code pages
USTACK 264 yes, by default user process stacks
FSDATA 116 yes, by default file system metadata
KDDATA 68736 yes, by default kernel dynamic data
KSDATA 259004 yes, by default kernel static data
Total pages on system: 4194304
Total pages included in dump: 328120
Dump compressed: OFF
DEVICE OFFSET(kB) SIZE (kB) LOGICAL VOL. NAME
------------ ---------- ---------- ------------ -----------------
31:0x03a000 310112 4194304 64:0x000002 /dev/vg00/lvol2
----------
4194304
If the compression option is turned OFF, then the system will not dump compressed even
when the environment of the crash is suitable to dump compressed.
The compression option is turned ON by default.
The init script option for crashconf sets the compression option every time the system boots
up. Setting CRASHCONF_COMPRESS to 1 in /etc/rc.config.d/crashconf turns
compressed dump ON whenever the system boots up. Setting it to 0 turns compressed dump
OFF. Not setting it, will not change the default compression hint in the kernel, which is to
dump compressed.
pstat_getcrashinfo [pstat (2)] can be used to query the current crashdump
configuration.
The field psc_flags field in the structure pst_crashinfo indicates the state of compressed
dump. The flag values for psc_flags are: