IBM 990 6.3 z/VM software support

Chapter 6. Software support 145

Draft Document for Review April 7, 2004 6:15 pm 6947ch06.fm

If a z990 processor running z/OSs with exploitation and compatibility support, and a new

hardware configuration is to activated, the H/W activate must be done on one of the z/OS

systems that run with exploitation support if both of the following conditions exist:

򐂰There is more than one Logical Channel Subsystem defined

򐂰A non-zero LCSS is being changed, or resources affected by the change are defined to

non-zero CSSs

On a z990, systems that are part of the same LPAR cluster may be in different LCSSs.

Dynamic CHPID management is supported even if the LPAR cluster spans multiple Logical

Channel Subsystems. Movement of CHPIDs within the LPAR cluster is confined to mo v ement

within that LCSS, since ESCON channels cannot span multiple Logical Channel Subsystems.

If an LPAR cluster spans multiple LCSSs, then the DCM command VARY SWITCH must be

issued from one of the systems with exploitation support. The DCM command SETIOS

DCM=ON/OFF can be issued from any system, whether in compatibility mode or exploitation

mode.

You must define more than one LCSS if you plan to use more than 15 logical partitions. An

individual Logical Channel Subsystem can only support up to 15 logical partitions.

In z/OS V1.2 and above and OS/390 V2.10, logical partitions running in compatibility mode

can only reside in LCSS 0.

Coupling Facilities, z/VM V4R4 and follow-on releases, and Linux on zSeries can reside in

any Logical Channel Subsystem.

6.3 z/VM software support

Compatibility support for z/VM on the z990 is provided for z/VM V3R1, and V4R3, It is

available through the normal service stream for z/VM. See the appropriate PSP bucket.

z/VM Compatibility support is almost identical to that for z/OS in the function that it provides.

The z990 compatibility support allows:

򐂰Support for up to four LCSSs

򐂰Dynamic I/O support for LCSS 0 only

򐂰Up to 15 Logical Partitions (LPAR identifiers < 15 (x’F’))

򐂰Internal and External spanned channels

For z/VM V4R4, and z/VM V5R1 Compatibility and Exploitation support is included. Some

items of interest are:

򐂰Up to 30 Logical Partitions

򐂰Up to four LCSSs

򐂰Dynamic I/O support for LCSS 0, 1, 2, and 3

򐂰24 processors (all CPs or all IFLs) within a single logical partition (in z/VM 5.1 only).

– Note that the sum of initial and reserved processors for an ESA/390 mode logical

partition can go up to 32 processors.