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Using crashutil to complete the saving of a dump
If devices are being used for both paging (swapping) and dumping, it is
very important to not disable savecrash processing at boot time. If this
is done, there is a chance that the memory image in the dump area will
be overwritten by normal paging activity. If, however, there are separate
dump and paging devices (no single device used for both purposes),
copying the memory image to the HP-UX file system area can be delayed
in order to speed up the boot process. To do this, edit the file /etc/
rc.config.d/savecrash and set the environment variable called
SAVECRASH=0.
If copying the physical memory image from the dump devices to the HP-
UX file system area has been delayed, run savecrash manually to do
the copy when the system is running. Confirm that enough space to hold
the copy in the HP-UX file system area has been configured before doing
so.
If a partial save is being done, the only pages copied to the HP-UX file
system area during the boot process are those that were on paging
devices. Pages residing on dedicated dump devices are still there. A
partial save can be selected by leaving the SAVECRASH environment set
to 1 and setting the environment variable SAVE_PART=1 in /etc/
rc.config.d/savecrash. To copy the remaining pages to the HP-UX
file system area when the system is running again, use the command
crashutil. See the crashutil(1M) manpage for details.
Example
/usr/sbin/crashutil -v CRASHDIR /var/adm/crash/
crash.0
Crash dump format conversion
Use crashutil to convert the file format when analyzing a crash dump
on a computer running a different version of HP-UX than the V-Class
server, or if the debugging tool does not recognize the specific format of
the saved file.
The basic format of the crashutil command to do a conversion is:
/usr/sbin/crashutil -v
version
Designates the version of the destination format.
source
Designates the pathname of the crash dump to be
converted.
Chapter 7
Abnormal system shutdowns
version source [destination]
Recovering from failures
163
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