When you specify DASD on the OUTPUT parameter, you direct the output
of the stand-alone dump program to a predefined dump data set on one
of the following types of DASD:
Note: The selection of the output device (DASD or tape) can be made
at both generation time and at run time. An output device specified
at run time overrides an output device specified at generation time.
When preparing to take a stand-alone dump to DASD, you must allocate
and initialize the dump data set using the AMDSADDD REXX or IPCS SADMP
dump data set utilities.
The following requirements exist for the allocation of the DASD
dump data set:
- The dump data set must have the text ‘SADMP’ as either part of,
or as an entire data set qualifier.
- Do not place a data set that is intended to contain a stand-alone
dump on a volume that also contains a page data set that the stand-alone
dump program you might need to dump. When stand-alone dump initializes
a page volume for virtual dump processing, it checks to see if the
output dump data set also exists on this volume. If it does, the
stand-alone dump program issues message AMD100I and does not retrieve
any data from page data sets on this volume. Thus, the dump might
not contain all of the data that you requested. This lack of data
can impair subsequent diagnosis.
- The dump data set cannot be defined on the same volume that contains
the IPL text of stand-alone dump.
Note: Because the data set does
not have to be cataloged, there can be more than one dump data set
with the same name per system. Furthermore, because the data set can
be uniquely named, there can be more than one dump data set per volume.
- IBM® recommends that you
define the dump data set on a volume that does not contain any other
data sets, especially volumes that contain sysplex couple data sets.
This ensures maximum capacity when needed and avoid the possibility
of other data sets being accessed by another system.
- The dump data set must be both allocated and initialized using
the AMDSADDD REXX or IPCS SADMP dump data set utilities.
- Because the stand-alone
dump program must be able to locate the dump data set on the output
device being used, it is imperative that the necessary data set management
steps be taken so that the stand-alone dump data sets are not placed
into a migrated state or moved to a different volume. The dump data
sets must also be exempt from any space management processing that
releases unused space.
When the dump data set is filled, the stand-alone dump program
prompts the operator, with message AMD001A, to specify another output
device. The stand-alone dump program can continue dumping to any
stand-alone dump supported device, however, after a tape device is
selected, it must be used to complete the dump even though multiple
tape volumes can be required.
Note: Dumping to multiple DASD dump data sets requires that each dump
data set used has been preformatted by the AMDSADDD REXX or IPCS SADMP
dump data set utilities.