Mainframe Operations; Mainframe Configuration; Storage Subsystem Ids; Ssid Requirements - HP XP20000/XP24000 Operation Manual

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 XP Continuous Access for Mainframe environment. When devices are part of an XP Continuous
Access 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
Controller Emulation
3990-6, 3990-6E
2105; 2107 *
NOTE:
* Compatible PAV operations require that one SSID be set for each set of 256 LDEVs.

SSID Requirements

0004 - FFFD
0004 - FFFD
XP Disk Array Mainframe Host Attachment and Operations Guide
LVI Support
3390-x, OPEN-x
3390-x, OPEN-x
29