Front cover ABCs of z/OSS System Programmingamming Volume 3 DFSMS, data set basics Storage management hardware and software System-managed storage, ISMF Paul Rogers Redelf Janssen Rita Pleus Valeria Sokal ibm.com/redbooks International Technical Support Organization ABCs of z/OS System Programming Volume 3 November 2004 SG24-6983-00 Note: Before using this information and the product it supports, read the information in “Notices” on page vii. First Edition (November 2004) This edition applies to Version 1, Release 4, of z/OS™ (5694-A01), to Version 1, Release 4, of z/OS.e™ (5655-G52), and to all subsequent releases and modifications until otherwise indicated in new editions. © Copyright International Business Machines Corporation 2004. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Notices . vii Trademarks . viii Preface . ix The team that wrote this redbook. ix Become a published author . .x Comments welcome. .x Chapter 1. DFSMS introduction . 1 1.1 Introduction to DFSMS . 3 1.2 Data Facility Storage Management Subsystem . 4 1.3 DFSMSdfp component . 5 1.4 DFSMSdss component . 7 1.5 DFSMSrmm component . 9 1.6 DFSMShsm component . 11 1.7 DFSMStvs component . 13 Chapter 2. Data set basics . 15 2.1 Data sets . 17 2.2 Data set name rules . 18 2.3 DFSMSdfp data set organizations . 19 2.4 Types of VSAM data sets . 21 2.5 Non-VSAM data sets. 22 2.6 Extended-format data sets and objects. 23 2.7 z/OS UNIX files . 25 2.8 Data set organization (DSORG) . 27 2.9 Allocate a data set with ISPF 3.2 . 29 2.10 Logical record length (LRECL) . 30 2.11 Locating a data set . 32 2.12 Uncataloged and cataloged data sets. 34 2.13 Volume table of contents (VTOC) . 35 2.14 Data set control block (DSCB) . 36 2.15 VTOC index structure . 38 2.16 Initializing a volume (ICKDSF) . 40 2.17 Problem determination . 43 Chapter 3. Storage management hardware . 45 3.1 Overview of DASD types. 46 3.2 Traditional DASD capacity . 48 3.3 Large Volume Support . 49 3.4 Redundant array of independent disks (RAID) . 51 3.5 Seascape architecture . 53 3.6 Enterprise Storage Server (ESS) . 56 3.7 ESS universal access . 58 3.8 Operating systems supporting ESS . 59 3.9 ESS major components . 60 3.10 ESS host adapters . 61 3.11 FICON host adapters . 62 3.12 ESS disks . 64 © Copyright IBM Corp. 2004. All rights reserved. iii 3.13 Device adapters . 66 3.14 SSA loops . 68 3.15 RAID-10 . 70 3.16 Storage balancing with RAID-10 . 72 3.17 ESS performance features . 73 3.18 WLM controlling PAVs . 75 3.19 ESS copy services . 77 3.20 TotalStorage Expert product highlights . 80 3.21 Introduction to tape processing . 82 3.22 SL and NL format . 84 3.23 Tape capacity - tape mount management. 86 3.24 TotalStorage Enterprise Tape Drive 3592 Model J1A. 88 3.25 IBM TotalStorage Enterprise Automated Tape Library 3494 . 90 3.26 Introduction to Virtual Tape Server (VTS) . 92 3.27 IBM TotalStorage Peer-to-Peer VTS. 94 3.28 Storage area network (SAN) . 96 Chapter 4. Storage management software . 99 4.1 Overview of DFSMSdfp utilities. 100 4.2 IEBCOMPR (compare data set) program . 102 4.3 Comparing data sets . 104 4.4 IEBCOPY utility . 105 4.5 IEBCOPY copy operation . 107 4.6 IEBCOPY compress operation . ..