Multiple Subchannel Sets; Three Subchannel Sets - IBM z13s Technical Manual

(64 X 1024) -1=65535
Table 7-19 lists the minimum operating system level that is required on the z13s.
Table 7-19 Minimum support requirements for 63.75-K subchannels
Operating system
z/OS
z/VM
Linux on z Systems

7.3.18 Multiple Subchannel Sets

Multiple Subchannel Sets (MSS), first introduced in z9 EC, provide a mechanism for
addressing more than 63.75-K I/O devices and aliases for ESCON
FICON (CHPID types FC) on the z13, z13s, zEC12, zBC12, z196, z114, z10 EC, and z9 EC.
z196 introduced the third subchannel set (SS2), which is not available in zBC12. With z13s
servers, three subchannel sets are now available.
Table 7-20 lists the minimum operating system levels that are required on the z13s.
Table 7-20 Minimum software requirement for MSS
Operating system
z/OS
z/VM
Linux on z Systems
a. For specific Geographically Dispersed Parallel Sysplex (GDPS) usage only
z/VM V6R3 MSS support for mirrored direct access storage device (DASD) provides a subset
of host support for the MSS facility to allow using an alternative subchannel set for a
Peer-to-Peer Remote Copy (PPRC) secondary volumes.

7.3.19 Three subchannel sets

With z13s, a third subchannel set (SS2) is introduced. Together with the second subchannel
set (SS1), SS2 can be used for disk alias devices of both primary and secondary devices, and
as Metro Mirror secondary devices. These subchannel sets help facilitate storage growth and
complement other functions, such as extended address volume (EAV) and Hyper Parallel
Access Volumes (HyperPAV).
1
ESCON features are not supported on z13s servers.
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IBM z13s Technical Guide
Support requirements
z/OS V1R12
z/VM V6R2
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 11
Red Hat RHEL 7
Red Hat RHEL 6
Support requirements
z/OS V1R12
a
z/VM V6R3
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 11
Red Hat RHEL 7
Red Hat RHEL 6
1
(CHPID type CNC) and