3 Mainframe operations
This chapter discusses the operations available for mainframe hosts.
Mainframe configuration
The first step in configuring the storage system is to define the storage system to the mainframe
host(s). The three basic areas requiring definition are:
• Subsystem ID (SSIDs)
• Hardware definitions, including I/O Configuration Program (IOCP) or Hardware Configuration
Definition (HCD)
• Operating system definitions (HCD or OS commands)
NOTE: The default primary missing interrupt handler (MIH) time interval that the storage system
reports to the host operating system is 30 seconds. HP recommends that this default MIH time be
changed to 45 seconds for those devices that are shared across multiple members of a Sysplex
and are not part of an Continuous Access Synchronous for Mainframe environment. When devices
are part of an Continuous Access Synchronous for Mainframe or Continuous Access Journal for
Mainframe environment, the recommended MIH value is 60 seconds. When devices are the target
volumes of a Data Migration effort, the recommended MIH value is 120 seconds.
Storage subsystem IDs
SSIDs are used for reporting information from the CU (or controller) to the operating system. The
SSIDs are assigned by the user and must be unique to all connected host operating environments.
Each group of 64 or 256 volumes requires one SSID, so there are one or four SSIDs per CU image.
The user-specified SSIDs are assigned during installation. The following table lists the SSID
requirements.
Table 9 SSID requirements
LVI SupportSSID RequirementsController Emulation
3390-xx0004 - FEFF2105; 2107 *
NOTE: * Compatible PAV operations require that one SSID be set for each set of 256 LDEVs.
Mainframe hardware definition
Hardware definition using IOCP (MVS, VM, or VSE)
The I/O Configuration Program (IOCP) can be used to define the storage system in MVS, VM,
and VSE environments (wherever HCD cannot be used). The storage system supports up to 255
control unit (CU) images and up to 65,280 LDEVs. Each CU image can hold up to 256 LDEV
addresses. A CU image is the same as an IBM logical sub-system (LSS). The CUADD parameter
Mainframe configuration 21
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