HP XP P9500 Storage - Manual (Page 11)

3 Defining devices
This topic contains information on selecting base and alias device ratios, and procedures for
defining LCUs and devices using HCD (hardware configuration definition).
Parallel Access Volumes users use the HCD program to define logical control units (LCUs) and
Parallel Access Volumes devices to the host system.
Selecting optimum base/alias device ratio
Optimizing the number of alias devices in a LCU is best done using analysis of RMF data. As part
of sizing the performance of your P9500, HP will provide recommendations for the number of
aliases based on the current configuration. In most cases, the number of recommended aliases
differs depending on which type of PAV is used (static, dynamic, or Hyper). HPs tool will predict
the appropriate number of aliases by LCU even if PAV is not currently being used in your
environment.
Defining an LCU
Use the Hardware Configuration Definition (HCD) program to define an LCU on a storage system.
Prerequisite
Channel paths must be defined.
Procedure 1 To define an LCU on a storage system:
1. From the ISPF/PDF primary options menu, select the HCD option to display the HCD main
screen.
2. Verify the name of the Work IODF to be used, and then select option 1 to display the Define,
Modify or View Configuration Data screen.
Selecting optimum base/alias device ratio 11