ZOS培训第三章.ppt

第三章 OS/390的存储管理子系统 DFSMS-What does it do? DFSMS-What does it do? Lets the operating system take over storage management tasks Data set allocation Backup management Space management Availability management Reduces number of people needed to manage storage What is SMS? SMS in an MVS subsystem SMS in an MVS subsystem Manages the current storage management policy (active Manages the current storage management policy (active configuration) configuration) Reduces end user data set creation allocation complexity Reduces end user data set creation allocation complexity Increases installation control of DASD, tape, and optical Increases installation control of DASD, tape, and optical storage storage There is one SMS and one SMS address space per There is one SMS and one SMS address space per instance of MVS (z/OS) instance of MVS (z/OS) SMS runs in both the users and the SMS address SMS runs in both the users and the SMS address space space DFSMS Evolution DFSMS Release strategy DFSMS System Components SMS Design Considerations Clearly separate the domains of users, data and storage media Introduce the roll of storage administrator Preserve customer investment in JCL and other structures Unmanaged environment Managed Environment Storage group storgrp1 Why should I use it ? Reduce out of space abends (X37) Reduce device fragmentation Balance allocations across a pool of devices Improve storage utilization Help achieve device independence SMS User Interactions Some basic terms SMS complex System/system group name Base configuration information Storage group Storage class Management class Data class ACS routine System Group What is an SMS Configuration A configuration is a storage management policy It contains elements which define that policy: Base configuration information Storage groups volumes Storage classes Management classes Data Classes Automatic Class Selection (ACS) routines Optical and tape libraries and drives Aggregate groups What is minimal confi