HP-UX Compressed Dump Release Notes

HP-UX Compressed Dump Release Notes
What’s in This Version
Chapter 16
What’s in This Version
This section lists and describes the features that HP-UX Compressed Dump A.01.01 supports.
HP-UX Compressed Dump A.01.01 offers the following features:
• increased dump speed by at least a factor of 3 for selective dumps excluding UNUSED
pages
NOTE On a machine that took X hrs. of time to dump, with the option of
compressed dump, the dump time should reduce to X/3 hrs. at least (this
includes the time for savecrash to copy the dump image to disk).
• reduction in the time taken to save the dump to file system by at least a factor of 3
• crashconf support to turn the Compressed Dump feature ON or OFF (see the
crashconf (1M) man page)
• Capability to convert the compressed dump to any of its older formats
Configuring Compressed Dump
The Compressed Dump functionality affects dump configuration, dump-time console
user-interface, dump file format, access library, and dump manipulation commands.
This release of Compressed Dump includes changes to crashconf to configure Compressed
Dump. crashconf used with the new -c option turns compression hint to the kernel ON or
OFF as follows:
# crashconf -c on
# crashconf -v
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