IBM XIV Storage System Gen3 Version 11.6.2 Product Overview IBM GC27-3912-10 Note Before using this document and the product it supports, read the information in “Notices” on page 145. Edition notice Publication number: GC27-3912-10. This publication applies to IBM XIV Storage System version 11.6.2 and to all subsequent releases and modifications until otherwise indicated in a newer publication. © Copyright IBM Corporation 2008, 2016. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Figures ................................... vii Tables .................................... ix About this document .............................. xi Intended audience ................................. xi Document conventions................................ xi Related information and publications ........................... xi IBM Publications Center ............................... xii Sending your comments ............................... xii Getting information, help, and service .......................... xii Chapter 1. Introduction ............................. 1 Features and functionality ............................... 2 Hardware overview ................................. 3 Hardware components ............................... 3 Hardware enhancements .............................. 4 Management options ............................... 5 Reliability .................................... 5 Redundant components............................... 5 Data mirroring.................................. 6 Self-healing mechanisms .............................. 6 Protected cache ................................. 6 Redundant power ................................ 6 SSD cache drives ................................. 7 Performance ................................... 7 Functionality ................................... 8 Snapshot management ............................... 8 Consistency groups for snapshots ........................... 8 Storage pools .................................. 8 Remote monitoring and diagnostics........................... 8 SNMP .................................... 9 Multipathing .................................. 9 Automatic event notifications ............................. 9 Management through GUI and CLI........................... 9 External replication mechanisms ............................ 9 Upgradability .................................. 9 Chapter 2. Volumes and snapshots ....................... 11 Volume function and lifecycle ............................. 11 Support for Symantec Storage Foundation Thin Reclamation .................. 11 Snapshot function and lifecycle ............................. 12 Creating a snapshot ............................... 13 Locking and unlocking snapshots ........................... 14 Duplicating a snapshot .............................. 14 Creating a snapshot of a snapshot ........................... 14 Formatting a snapshot or a snapshot group........................ 15 Additional snapshot attributes ............................. 16 Redirect-on-Write (ROW) ............................... 17 Full Volume Copy ................................. 19 Restoring volumes and snapshots ............................ 20 Chapter 3. Storage pools ............................ 23 Protecting snapshots at a storage pool level......................... 24 © Copyright IBM Corp. 2008, 2016 iii Thin provisioning ................................. 24 Instant space reclamation .............................. 26 Chapter 4. Consistency groups ......................... 29 Snapshot of a consistency group ............................ 30 Consistency group snapshot lifecycle ........................... 32 Chapter 5. QoS performance classes....................... 35 Chapter 6. Connectivity with hosts........................ 37 IP and Ethernet connectivity.............................. 37 Ethernet ports ................................. 38 IPv6 certification................................. 38 Management connectivity ............................. 38 Field technician ports ............................... 39 Configuration guidelines summary .......................... 40 Host system attachment ............................... 40 Balanced traffic without a single point of failure ...................... 41 Dynamic rate adaptation .............................. 41 Attaching volumes to hosts ............................. 41 Excluding LUN0................................. 41 Advanced host attachment .............................. 42 CHAP authentication of iSCSI hosts ........................... 42 Clustering hosts into LUN maps ............................ 43 Volume mapping exceptions ............................. 45 Supporting VMware extended operations ......................... 46 Writing zeroes ................................. 46 Hardware-assisted locking ............................. 47 Fast copy ................................... 47 Chapter 7. IBM Real-time Compression with XIV .................. 49 Turbo Compression in model 314 ............................ 50 Benefits of IBM Real-time Compression .......................... 50 Planning for compression............................... 50 Understanding compression rates, ratios and savings .................... 51 Prerequisites and limitations............................. 51 Estimating compression savings ........................... 52 Chapter 8. Synchronous remote mirroring .................... 57 Remote mirroring basic concepts ............................ 57 Remote mirroring operation .............................. 58 Configuration options ................................ 59 Volume configuration ............................... 59 Communication errors............................... 60 Coupling activation................................ 60 Synchronous mirroring statuses............................. 61 Link status .................................. 61 Operational status ................................ 62 Synchronization status............................... 62 I/O operations .................................. 63 Synchronization process ............................... 64 State diagram.................................. 64 Coupling recovery ................................ 65 Uncommitted data ................................ 65 Constraints and limitations ............................. 65 Last-consistent snapshots .............................. 66 Secondary locked error status ............................ 67 Role switchover .................................. 68 Role switchover when remote mirroring is operational .................... 68 Role switchover when remote mirroring is nonoperational................... 68 iv IBM XIV Storage System Gen3 – Product Overview Resumption of remote mirroring after role change ..................... 70 Remote mirroring ................................. 71 Remote mirroring and consistency groups ........................ 71 Using remote mirroring for media error recovery ...................... 72 Supported configurations .............................. 72 I/O performance versus synchronization speed optimization .................. 72 Implications regarding volume and snapshot management .................. 72 Chapter 9. Asynchronous remote mirroring .................... 75 Features .................................... 76 Asynchronous remote mirroring terminology ....................... 77 Specifications .................................. 78 Technological overview ............................... 78 Replication scheme ................................ 79 Snapshot-based technology ............................. 80 Mirroring-special snapshots ............................. 80 Initializing the mirroring .............................. 81 The sync job .................................. 83 Mirroring schedules and intervals ........................... 83 The mirror snapshot (ad-hoc sync job) ......................... 85 Determining replication and mirror states ........................ 85 Asynchronous mirroring process walkthrough....................... 95 Peers roles .................................. 101 Activating the mirroring.............................. 102 Mirroring consistency groups ............................. 104 Setting a consistency group to be mirrored ....................... 105 Creating a mirrored consistency group ......................... 106 Adding a mirrored volume to a mirrored consistency group.................. 106 Removing a volume from a mirrored consistency group ................... 106 Chapter 10. Multi-site mirroring......................... 109 Multi-site mirroring terminology ............................ 109 Multi-site mirroring technological overview ........................ 110 Chapter 11. IBM Hyper-Scale Mobility ...................... 113 The IBM Hyper-Scale Mobility process .......................... 113 Chapter 12. Data-at-rest encryption ....................... 117 HIPAA compatibility ................................ 117 Chapter 13. Management and monitoring .................... 119 Chapter 14. Event notification destinations ................... 121 Event information ................................. 121 Event notification rules ............................... 122 Event information ................................. 123 Event notification gateways ............................. 124 Chapter 15. User roles and permissions ..................... 125 User groups ................................... 126 Predefined users ................................. 126 User