HP-UX 11i Version 1.5 System Crash Dump

Crash Dump Conﬁguration

Chapter 114

An important feature listed in the table above is the ability to read

/etc/fstab and conﬁgure all devices marked “dump”.

In addition to conﬁguring dump devices, crashconf (both the system call

and the command) can also be used to conﬁgure the classes of memory

that will be included in, or excluded from, the dump. If desired, this

information can also be conﬁgured at kernel build time, by setting the

bitmask tunables alwaysdump and dontdump. Refer to the

/usr/include/sys/crashconf.h ﬁle or the output of the

crashconf(1M) command for the current list of memory classes.

In most circumstances, it should not be necessary to modify the list of

individual memory classes to be dumped. The default settings provide

adequate information for debugging nearly all system panics while

eliminating as much extraneous data from the dump as possible.

In actual practice, if crash dump is reconﬁgured at all, it is usually done

to force a full dump, or to disable dumps entirely.

Full dumps are enabled by including all pages in the dump. This is done

with “crashconf -i all” or by setting

CRASH_INCLUDED_PAGES=”all” in /etc/rc.config.d/crashconf.

Dumps are disabled by excluding all pages from the dump. Again, this is

done with “crashconf -e all” or by setting

CRASH_EXCLUDED_PAGES=”all” in /etc/rc.config.d/crashconf.

Finally, crashconf(1M) uses the pstat interfaces

pstat_getcrashinfo(2) and pstat_getcrashdev(2) to provide a report

of which devices are conﬁgured, which memory classes will be included,

swapon(1M) can also read

/etc/fstab and conﬁgure

all devices marked as “swap”.

crashconf(1M) can also read

/etc/fstab and conﬁgure all

devices marked “dump”.

SAM can be used to

conﬁgure swap devices.

SAM can be used to conﬁgure

swap devices.

The primary swap device can

also be conﬁgured into the

kernel at kernel build time.

Dump devices can also be

conﬁgured into the kernel at

kernel build time, in the exact

same manner as before.

Table 1-2

Swap Devices Dump Devices