HP-UX 11i v3 Crash Dump Improvements

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# crashconf -v
Crash dump configuration has been changed since boot.
CLASS PAGES INCLUDED IN DUMP DESCRIPTION
-------- ---------- ---------------- -------------------------------------
UNUSED 2659456 no, by default unused pages
USERPG 61331 no, by default user process pages
BCACHE 19807 no, by default buffer cache pages
KCODE 4425 no, by default kernel code pages
USTACK 1074 yes, by default user process stacks
FSDATA 90 yes, by default file system metadata
KDDATA 108403 yes, by default kernel dynamic data
KSDATA 248157 yes, by default kernel static data
SUPERPG 42473 no, by default unused kernel super pages
Total pages on system: 3145216
Total pages included in dump: 357724
Dump compressed: ON
Dump Parallel: ON
DEVICE OFFSET(kB) SIZE (kB) LOGICAL VOL. NAME
------------ ---------- ---------- ------------ -------------------------
1:0x000001 1051488 4194304 64:0x000002 /dev/vg00/lvol2
1:0x000000 0 143374740 /dev/disk/disk4 (offline)
----------
147569044
Dump device configuration mode is config_deprecated_mode.
Use crashconf -s option to change the mode.
5.3 Device special file redirection
If a dump device goes offline or fails and needs to be replaced, the HP-UX 11i v3 mass storage
subsystem will put the new lun in an "Authentication Failure" state and disallow access until the
lun has been authenticated via the ‘scsimgr replace_wwid‘ command. A message is logged to
syslog informing the user that the replace_wwid operation needs to be performed. At this point
the user can also redirect the original device special file to the new disk via either an option on
the ‘scsimgr replace_wwid‘ command or via io_redirect_dsf(1m). The dump subsystem will get an
event notification of the device file redirection and will then reconfigure dump to work with the
new device. If the re-configuration fails, dump will mark the device off-line.
5.4 Disabling of legacy device special files
By default, as discussed in section 4.3, HP-UX 11i v3 has two modes of operation with respect to
device special file creation and formats: legacy and a new “persistent” format. If desired the
administrator can disable legacy device files via the ‘rmsf –L’ command (see rmsf(1m) for details).
This removes all legacy device files and I/O tree nodes, and disables further creation of legacy
nodes and device files.
Note: On a system with multiple boot disks containing different OS versions, if a legacy-disabled HP-UX
11i v3 system crashes and the next boot is on previous release of HP-UX (e.g., HP-UX 11i v2), savecrash
will not be able to save the dump. Likewise, if a legacy-enabled HP-UX 11i v3 or pre-11i v3 kernel crashes
and the next boot of the system is on a legacy-disabled kernel, savecrash will fail.
In these cases the boot will otherwise succeed, and the dump can still be saved by rebooting an
appropriate kernel.
See also the WARNINGS section in the savecrash(1m) man page.