System Debug Reference Manual (32650-90888)

Chapter 5 179
System Debug Command Specifications Fx-LOG
H[ELP]
much of the dump has been read in by printing a dot every time it transfers 10% of each
file in the dump file from tape to disk. When the dump has been fully restored, the amount
of disk space saved due to data compression is displayed.
Limitations, Restrictions
DUMP stores data on dump tapes in compressed form. Prior to DAT A.01.18, dumps were
restored on disk in expanded form, possibly resulting in extremely large dump files. As of
DAT A.01.18 and later versions, the GETDUMP command restores dumps in compressed
form, often resulting in a significant savings in disk space when compared to
uncompressed dumps. These versions of DAT are also able to access (with OPENDUMP)
uncompressed dumps restored by previous DAT versions.
GETDUMP always creates at least one file when restoring a dump, known as the MEM file.
Its name is made up of the dump file name followed by "MEM". Uncompressed dump files
use separate files for storing data dumped from secondary store (LDEVs) and Processor
Internal Memory (PIM), while compressed dumps are usually restored entirely within the
MEM file.
H[ELP]
Displays online help messages for System Debug.
Syntax
H[ELP] [ topic ] [ options ]
The HELP command is used to obtain help information about any command, window
command, user macro, user variable, function, environment variable, and so on. Some
items may fall into more than one category. For example, S is the single step command
and
the CM S register. In such cases, the help entries for all defined items are displayed.
Refer to the WHELP command for an overview of window commands.
Parameters
topic The topic for which help is desired. Help is available for a single:
• Command name.
• Environment variable name.
• Predefined function name.
• Macro name.
• User variable name.
Use the CMDLIST, ENVLIST, FUNCLIST, MACLIST, and VARLIST
commands to see all of the names that are defined for each respective class