System Administration Commands savecore(1M)
NAME
savecore - save a crash dump of the operating system
SYNOPSIS
/usr/bin/savecore [-Lvd] [-f dumpfile] [directory]
DESCRIPTION
The savecore utility saves a crash dump of the kernel
(assuming that one was made) and writes a reboot message in
the shutdown log. It is invoked by the dumpadm service each
time the system boots.
savecore saves the crash dump data in the file
directory/vmcore.n and the kernel's namelist in
directory/unix.n. The trailing .n in the pathnames is
replaced by a number which grows every time savecore is run
in that directory.
Before writing out a crash dump, savecore reads a number
from the file directory/minfree. This is the minimum number
of kilobytes that must remain free on the file system con-
taining directory. If after saving the crash dump the file
system containing directory would have less free space the
number of kilobytes specified in minfree, the crash dump is
not saved. if the minfree file does not exist, savecore
assumes a minfree value of 1 megabyte.
The savecore utility also logs a reboot message using facil-
ity LOGAUTH (see syslog(3C)). If the system crashed as a
result of a panic, savecore logs the panic string too.
OPTIONS
The following options are supported:
-d Disregard dump header valid flag. Force
savecore to attempt to save a crash dump even
if the header information stored on the dump
device indicates the dump has already been
saved.
-f dumpfile Attempt to save a crash dump from the speci-
fied file instead of from the system's
current dump device. This option may be use-
ful if the information stored on the dump
device has been copied to an on-disk file by
means of the dd(1M) command.
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System Administration Commands savecore(1M)
-L Save a crash dump of the live running Solaris
system, without actually rebooting or alter-
ing the system in any way. This option forces
savecore to save a live snapshot of the sys-
tem to the dump device, and then immediately
to retrieve the data and to write it out to a
new set of crash dump files in the specified
directory. Live system crash dumps can only
be performed if you have configured your sys-
tem to have a dedicated dump device using
dumpadm(1M).
savecore -L does not suspend the system, so
the contents of memory continue to change
while the dump is saved. This means that live
crash dumps are not fully self-consistent.
-v Verbose. Enables verbose error messages from
savecore.
OPERANDS
The following operands are supported:
directory Save the crash dump files to the specified
directory. If directory is not specified,
savecore saves the crash dump files to the
default savecore directory, configured by
dumpadm(1M).
FILES
directory/vmcore.n
directory/unix.n
directory/bounds
directory/minfree
/var/crash/'uname -n' default crash dump directory
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
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System Administration Commands savecore(1M)
ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWcsu
SEE ALSO
adb(1), mdb(1), svcs(1), dd(1M), dumpadm(1M), svcadm(1M),
syslog(3C), attributes(5), smf(5)
NOTES
The system crash dump service is managed by the service
management facility, smf(5), under the service identifier:
svc:/system/dumpadm:default
Administrative actions on this service, such as enabling,
disabling, or requesting restart, can be performed using
svcadm(1M). The service's status can be queried using the
svcs(1) command.
If the dump device is also being used as a swap device, you
must run savecore very soon after booting, before the swap
space containing the crash dump is overwritten by programs
currently running.
SunOS 5.11 Last change: 25 Sep 2004 3
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