IBM 990 - Manual (Page 149)

Chapter 6. Software support 137
z/OS with Compatibility Support must be IPLd in a partition that has an LPAR identifier in
the range 0-F. If the LPAR identifier is outside of this range, then z/OS will terminate with a
07C-02 wait state.
Dynamic activates for hardware changes can only be done for LCSS 0. A Power-on Reset
is required for changes to other Logical Channel Subsystems. Dynamic activate for
hardware changes within LCSS 0 cannot be done if the resource is also defined in any
other LCSS. For example, if a DASD control unit has connections to LCSS 1, 2, or 3, then
additional connections cannot be added to LCSS 0 dynamically while in compatibility
mode. Software activates can be done regardless of the number of LCSSs defined.
z/OS V1.4 z990 Compatibility Support feature
The Compatibility Support feature is an optional, unpriced orderable feature that is required to
allow z/OS Version 1 Release 4 to run on a z990. It offers the capability to execute on the
hardware in a way that is compatible with earlier processor models, but without exploitation of
new functions, although some new features (such as the increased number of HiperSockets)
can be used with this z/OS Version. This feature is no longer orderable and has been
replaced by the z/OS V1.4 z990 Exploitation Support feature since February 24, 2004.
6.2.2 Exploitation Support for z/OS
Exploitation Support for the z990 is delivered for z/OS V1.4. Follow-on z/OS releases will
have Exploitation Support included. For z/OS V1.4, it is shipped as a separately orderable
feature.
z/OS Exploitation Support allows:
z/OS to run in a partition defined to any Logical Channel Subsystem
z/OS to run in a partition with an LPAR identifier greater than x’F’
z/OS dynamic activation for hardware changes to any Logical Channel Subsystem
z/OS V1.4 z990 Exploitation Support feature
The Exploitation Support feature is an optional unpriced orderable feature that provides
Exploitation Support for two Logical Channel Subsystems and 30 logical partitions. This is a
mandatory feature when ordering z/OS V1.4 as of February 24, 2004.
Other exploitation items are:
Dynamic I/O support to dynamically add, change, and delete channel paths, control units,
and devices in multiple Logical Channel Subsystems
Up to four Logical Channel Subsystems, with HCD PTFs
External spanned channels
z/OS V1.5 support
Exploitation Support (and Compatibility Support) is integrated into the base of z/OS V1.5 and
later releases. Exploitation Support in z/OS V1.5 offers:
Up to 30 Logical Partitions
Up to four Logical Channel Subsystems, with HCD PTFs