IBM Front cover iSeries in Storage Area Networks A Guide to Implementing FC Disk and Tape with iSeries Learn how iSeries fits in a SAN environment Plan how to migrate from SCSI to fiber channel disk and tape Understand the new Multipath function Nick Harris Jana Jamsek Joseph Raphael Nancy Roper ibm.com/redbooks International Technical Support Organization iSeries in Storage Area Networks A Guide to Implementing FC Disk and Tape with iSeries March 2005 SG24-6220-01 Note! Before using this information and the product it supports, read the information in “Notices” on page ix. Second Edition (March 2005) This edition applies to V5R1 and V5R2 of OS/400 and V5R3 of i5/OS. © Copyright International Business Machines Corporation 2002, 2005. 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 Contents . iii Notices . ix Trademarks . .x Preface . xi The team that wrote this redbook. xi Become a published author . xiii Comments welcome. xiii Part 1. Introduction and positioning . 1 Chapter 1. Introduction to iSeries and Storage Area Networks (SAN). 3 1.1 Overview of enhancements. 4 1.2 iSeries storage architecture . 4 1.2.1 Single-level storage . 5 1.2.2 iSeries storage management . 5 1.2.3 Main storage . 6 1.2.4 Cache . 7 1.2.5 Direct access storage device . 8 1.2.6 iSeries Fibre Channel support. 9 1.2.7 Multipath support for TotalStorage Enterprise Storage Server (ESS). 10 1.3 Enterprise Storage Server. 10 1.3.1 Storage consolidation . 11 1.3.2 Performance . 13 1.3.3 Disaster recovery and availability . 13 1.3.4 Storage Area Network. 13 1.4 Terminology . 14 1.4.1 Copy functions . 15 1.5 Storage Area Network. 19 Chapter 2. iSeries external storage positioning and examples . 21 2.1 Where external storage fits . 22 2.2 Examples of iSeries SAN environments . 24 2.2.1 iSeries direct attach configuration. 24 2.2.2 Internal mirrored to external configuration . 25 2.2.3 Mirrored external configuration . 26 2.2.4 iSeries and SAN-attached tape drives configuration. 27 2.2.5 iSeries and PPRC configuration . 28 2.2.6 iSeries and FlashCopy configuration . 29 2.2.7 Additional use of ESS FlashCopy . 30 Part 2. SAN . 33 Chapter 3. Storage Area Networks (SAN) . 35 3.1 Fibre Channel topologies . 36 3.1.1 Point-to-Point . 37 3.1.2 Arbitrated loop. 38 3.1.3 Switched fabric . 39 3.2 Making the right connections . 40 © Copyright IBM Corp. 2002, 2005. All rights reserved. iii 3.2.1 Cascaded switches . 40 3.2.2 Fibre Channel Arbitrated Loop (FC-AL) over switched fabric . 42 3.2.3 Distance . 43 3.2.4 Multiple target support . 44 3.2.5 Maintenance requirements . 46 3.3 Zoning . 46 3.3.1 IBM 2109 Switches . 48 3.3.2 McData Switches . 54 3.3.3 CNT (Inrange) Switches . 56 3.3.4 Cisco Switches . 58 Part 3. External disk . 61 Chapter 4. Planning for external disk . 63 4.1 ESS and iSeries hardware components . 65 4.2 Consideration for planning ESS with iSeries. 66 4.2.1 iSeries workloads . 67 4.2.2 Number of ESS ranks, capacity and speed of ESS disks. 67 4.2.3 iSeries Fibre Channel adapters. 67 4.2.4 Capacity and allocation of logical volumes . 70 4.2.5 Consolidating storage form iSeries and other servers . 71 4.2.6 SAN fabric. 71 4.3 Checklist for planning ESS with iSeries . 72 4.3.1 Obtain workload characteristics from available information . 80 4.3.2 Obtain workload statistics from PT reports . 81 4.3.3 Other requirements . 81 4.3.4 SAN fabric. 82 4.3.5 Rules of thumb . 82 4.3.6 Proposed configuration . 83 4.3.7 Workload from other servers. ..