Using filters
The LOADxx member specifies (among many other things):
- Information about the parmlib concatenation.
- Filtering keywords for hardware name, LPAR name, or VM user ID, so you can
use a single LOADxx member to define IPL parameters for multiple
systems.
Depending on the parmlib concatenation determined at IPL time, that is,
the LOADxx used and the filters, the IPL-ed system can run in different
modes.
You can use filters to restrict the scope of specific configuration
information to specific resources. Filters in msys for Setup work as
described in the z/OS MVS Initialization and Tuning
Reference. By using a filter, you can define configuration
information to apply to:
- A single piece of hardware. Specify a hardware name to restrict the
scope to certain hardware.
- A logical partition. Specify an LPAR name if your system runs in an
LPAR.
- A virtual machine under VM. Specify the user ID of a VM/ESA or a
z/VM system under which your system is running as a guest.
Rules:
- If you use filters in LOADxx or IEASYMxx or both, you must specify filters
when providing the system profile information for your system.
Otherwise changes made by msys for Setup in unfiltered sections might conflict
with settings in the existing filtered sections, with unpredictable
results.
- If you do not use filters in LOADxx or IEASYMxx, you can but need not
specify filter information when providing the system profile information for
your system. If you do, msys for Setup inserts the filter in both
LOADxx and IEASYMxx to make all configuration changes for the system profile
applicable to that filter only.
- Once a system profile with no filter information has been established,
further definitions of system profiles bearing the same load suffix, with or
without filter, is not possible.
- Once a system profile with filter information has been established,
further definitions of system profiles bearing the same load suffix must
provide a filter at the same level. You must not provide one filter
that constitutes a subset of another.
- Existing filters in IEASYM must be specified directly following a SYSDEF
keyword. Click here for an
example.
Related information: