livedump(5)livedump(5)NAMElivedump - a feature that saves operating system state to the file sys‐
tem for debugging purposes.
DESCRIPTION
is a feature by which a running operating system's state can be saved
to the filesystem without stopping/rebooting the system. The saved
dump can be used for debugging purposes.
saves the information in a existing dump format readable by the system
crash dump access library, See libcrash(5).
saves the images and related files in the directory The trailing n in
the directory name is a number that increases by one every time is run
with the same This number is stored in the file If the file does not
exist in the configured path then it is created and the default value
of 2 is stored in it.
supports both blocking and non-blocking invocation. In a blocking
invocation, the control will be returned to the invoker only after com‐
pletes.
In case of a non-blocking invocation, the control will be returned to
the callee and the user can query the status of by using the command.
For blocking mode invocation, messages will be printed on the user con‐
sole, and for non-blocking mode invocation, messages are stored in the
syslog file
supports selective dump using page classification similar to crash
dump. uses filesystem space to save the operating system state. The
amount of filesystem space to be left free can be configured by the
user. The operating system state saved by is in the form of image
files. The maximum size of each image is also configurable by the
user. The location on the filesystem where saves the system state can
be set by the user.
configuration can be queried/changed using the utility. See live‐
dump(1M) for more details.
The dump saved by is not a snapshot of system memory. Instead it is
the state over a period of time. As the system state keeps changing
continuously (when is in progress), the dump taken would be a transient
one. Due to this transientness some data structures may be broken in
the dump.
Definitions
minfree Amount of space to be left free upon completion of If
detects that the free disk space has fallen below min‐
free value, it stops saving the dump. The saved dump,
in this case, may not be debuggable.
chunksize Size of a single physical memory image file. See live‐
dump(1M) for details.
pageclass System memory classes. See crashconf(2) for details on
defined system memory classes. does not support saving
of the buffer cache and unused pages.
sid The session id associated with every session. generates
this id for each invocation in order to identify a ses‐
sion uniquely. The user can use this id to specify the
session to be aborted.
path Directory to save the If this option is not specified,
then is used as the default directory to save the dump.
AUTHOR
The feature described here was developed by Hewlett-Packard.
FILES
messages saved by
SEE ALSOlivedump(1M), crashconf(2), libcrash(5).
livedump(5)
