Compressed Dump

Compressed Dump White Paper, Version 1.3

page 6

class is the name (or number) of a system memory class which should be added to

the appropriate class list. The list of system memory classes can be obtained using

crashconf -v. The memory page size is 4Kb.

class may also be the word all, in which case all classes are added to the appropri-

ate list. (The effect of adding all classes to the included class list is to force full

crash dumps under all circumstances. The effect of adding all classes to the

excluded class list is to disable crash dumps.)

mode, either ON or OFF, will turn compression ON or OFF, in the dump path.

Options

-a The ﬁle /etc/fstab is read, and all dump devices identiﬁed init will be

added to (or will replace) the current list of crash dump devices. This

is in addition to any crash dump devices speciﬁed on the command

line. See fstab(4) for information on the format of /etc/fstab.

-c The mode speciﬁed with -c will be used to set the compression mode.

If the system is not able to identify enough processing resources to

do compressed dump, a warning message will be issued.

-e The classes speciﬁed with -e will be added to (or will replace) the list

of excluded (i.e., should not dump) classes. If any of those classes

are present in the current included class list, they will be removed

from it.

-i The classes speciﬁed with -i will be added to (or will replace) the list

of included (i.e., must dump) classes. If any of those classes are

present in the current excluded class list, they will be removed from it.

-r Speciﬁes that any changes should replace, rather than add to the cur-

rent conﬁguration. Thus, if devices or -a are speciﬁed, the current

crash dump device list is replaced with new contents; if classes are

speciﬁed with -e, they replace the list of currently excluded classes,

and if classes are speciﬁed with -i, they replace the list of currently

included classes.

-t When used with the -i, -e or -c options, sets the dump tunables

alwaysdump, dontdump and dump_compress_on respectively, to

make the changes persistent across system reboots.

-v Displays the current crash dump conﬁguration. This is the default

option if no arguments are speciﬁed. If any changes to the current

conﬁguration are speciﬁed on the same command line as -v, the con-

ﬁguration will be displayed after the requested changes are made.

RETURN VALUE

Upon exit, crashconf returns the following values:

0 Success.

1 The requested conﬁguration changes could not be made.