IBM manual Software enhancements for the DS8000, 13.2 z/OS enhancements, Scalability support

13.1 Software enhancements for the DS8000

A number of enhancements have been introduced into the z/OS, z/VM, z/VSE,VSE/ESA and TPF operating systems to support the DS8000. The enhancements are not just to support the DS8000, but also to provide additional benefits that are not specific to the DS8000.

13.2 z/OS enhancements

The DS8000 series simplifies system deployment by supporting major server platforms. The DS8000 will be supported on the following releases of the z/OS operating system and functional products:

￿z/OS 1.4 and higher

￿Device support facility (ICKDSF) Release 17

￿Environmental Record Editing and Printing (EREP) 3.5

￿DFSORT™

To exploit the DS8000 in exploitation mode, the Data Facilities Storage Management Subsystem (DFSMS) product of z/Series software is enhanced by way of a Small Programming Enhancement (SPE).

Hosts with operating system software levels prior to z/OS 1.4 are not supported. zLinux will only recognize the DS8000 as a 2105 device.

Important: Always review the latest Preventative Service Planning (PSP) 2107DEVICE bucket for software updates.

The PSP information can be found at:

http://www-1.ibm.com/servers/resourcelink/svc03100.nsf?OpenDatabase

The software enhancements have been introduced in the following areas:

￿Scalability support

￿Large Volume Support (LVS)

￿Read availability mask support

￿Initial Program Load (IPL) enhancements

￿DS8000 definition to host software

￿Read control unit and device recognition for DS8000

￿New performance statistics

￿Resource Management Facility (RMF)

￿Migration considerations

￿Coexistence considerations

13.2.1Scalability support

The IOS recovery is designed to support a small number of devices per control unit. Today, a unit check is presented on all devices at failover. This does not scale well with a DS8000 that

282DS8000 Series: Concepts and Architecture