Front cover iSCSI Implementation and Best Practices on IBM Storwize Storage Systems Jonathan Burton Anuj Chandra Jordan Fincher Kushal Patel Torsten Rothenwaldt Subhojit Roy Bharti Soni Shalaka Verma Megan Gilge In partnership with IBM Academy of Technology Redbooks International Technical Support Organization iSCSI Implementation and Best Practices on IBM Storwize Storage Systems October 2017 SG24-8327-01 Note: Before using this information and the product it supports, read the information in “Notices” on page ix. Second Edition (October 2017) This edition applies to Version 7, Release 8, Modification 0 of IBM Spectrum Virtualize. © Copyright International Business Machines Corporation 2016, 2017. 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 . ix Trademarks . .x Preface . xi Authors. xi Now you can become a published author, too! . xiii Comments welcome. xiv Stay connected to IBM Redbooks . xiv Summary of changes. .xv October 2017, Second Edition . .xv Part 1. iSCSI overview . 1 Chapter 1. Use cases for iSCSI virtualization. 3 1.1 Consolidating iSCSI storage consolidation . 4 1.2 Removing capacity silos from data centers. 4 1.3 Improving the performance of iSCSI storage systems . 5 Chapter 2. Introduction to iSCSI in IBM Storwize storage systems . 7 2.1 What iSCSI is . 8 2.2 iSCSI sessions . 9 2.2.1 Components of an iSCSI session . 9 2.2.2 The three phases of iSCSI login . 10 2.3 iSCSI adapters . 11 2.3.1 Ethernet card (network interface card) . 11 2.3.2 TCP offload engine . 12 2.3.3 iSCSI offload engine . 13 2.4 iSCSI routing . 13 2.5 Ethernet for iSCSI . 14 2.5.1 Data Center Bridging . 14 2.5.2 The future of Ethernet and its impact on iSCSI. 17 2.6 Fibre Channel: FCoE terms and their iSCSI equivalents . 18 2.6.1 Fibre Channel zoning . 18 2.6.2 Virtual SAN . 18 2.6.3 Buffer-to-Buffer credit . 18 2.6.4 Worldwide name . 18 2.6.5 Fabric name server . 19 2.7 Comparison of iSCSI and FCoE . 19 2.8 Why use iSCSI . 20 2.8.1 iSCSI is cost-effective . 20 2.8.2 No distance limitations . 20 2.8.3 Good interoperability. 20 2.8.4 Bandwidth usage and Converged Enhanced Ethernet benefits . 21 2.8.5 Security . 21 Chapter 3. External virtualization and host connectivity interface options for the IBM Storwize family . 23 3.1 Connectivity options for the IBM Storwize V5000 Gen2 storage system . 24 © Copyright IBM Corp. 2016, 2017. All rights reserved. iii 3.1.1 Connectivity options for the IBM Storwize V5010 storage system . 24 3.1.2 Connectivity options for the IBM Storwize V5020 storage system . 25 3.1.3 Connectivity options for IBM Storwize V5030 and IBM Storwize V5030F storage systems. 26 3.1.4 IBM Storwize V5010, IBM Storwize V5020, and IBM Storwize V5030 HIC options at a glance . 28 3.2 Connectivity options for the IBM Storwize V7000 storage system . 28 3.2.1 External connectivity options for the IBM Storwize V7000 Gen2+ . 29 3.2.2 External connectivity options for the IBM Storwize V7000 Gen2 . 30 3.3 The IBM Storwize V7000 Unified storage system. 32 3.4 SAN Volume Controller SV1 storage systems . 33 3.5 Hardware terminology for the IBM Storwize disk systems . 35 3.5.1 Control enclosures, nodes, and I/O groups. 35 3.5.2 Expansion enclosures. 36 3.5.3 IBM Storwize cluster system. 37 3.5.4 IBM Storwize virtualization . 37 Chapter 4. Planning considerations . 39 4.1 General considerations . 40 4.2 Network topology . 42 4.2.1 Network topology with one Ethernet switch . 42 4.2.2 Network topology with two VLANs . 43 4.2.3 Network topology with four VLANs . 43 4.2.4 Link aggregation between switches . 44 4.2.5 iSCSI that uses a Layer 3 network topology . 44 4.2.6 IP replication network topology . 45 4.3 Planning for host access . 46 4.3.1 Planning for IBM AIX. 46 4.3.2 Planning for Linux . 50 4.3.3 Planning for VMware. 51 4.3.4 Planning for Windows . 51 4.4 Planning considerations for external virtualization . 52 4.4.1 Network security . 52 4.4.2 iSCSI Protocol-specific considerations . ..