Data ONTAP 7.3 Active/Active Configuration Guide PDF
Preview Data ONTAP 7.3 Active/Active Configuration Guide
Data ONTAP® 7.3 Active/Active Configuration Guide NetApp, Inc. 495 East Java Drive Sunnyvale, CA 94089 U.S.A. Telephone: +1 (408) 822-6000 Fax: +1 (408) 822-4501 Support telephone: +1 (888) 4-NETAPP Documentation comments: [email protected] Information Web: http://www.netapp.com Part number 210-04502_A0 Updated for Data ONTAP 7.3.2 on 17 August 2009 Table of Contents | 3 Contents Copyright information...................................................................................9 Trademark information...............................................................................11 About this guide............................................................................................13 Audience......................................................................................................................13 Accessing Data ONTAP man pages............................................................................14 Terminology.................................................................................................................15 Where to enter commands...........................................................................................16 Keyboard and formatting conventions.........................................................................16 Special messages.........................................................................................................17 How to send your comments.......................................................................................18 Active/active configuration types and r equirements.................................19 Overview of active/active configurations ....................................................................19 What an active/active configuration is .............................................................19 Benefits of HA .................................................................................................20 Characteristics of nodes in an active/active configuration ..............................20 Best practices for deploying an active/active configuration ............................21 Comparison of active/active configuration types ............................................22 Standard active/active configurations ..........................................................................23 How Data ONTAP works with standard active/active configurations .............23 Standard active/active configuration diagram .................................................24 Setup requirements and restrictions for standard active/active configurations .......................................................................24 Configuration v ariations for standard active/active configurations .................25 Understanding mirrored active/active configurations ..................................................26 Advantages of mirrored active/active configurations ......................................26 Setup requirements and restrictions for mirrored active/active configurations .......................................................................27 Configuration v ariations for mirrored active/active configurations ................28 Understanding stretch MetroClusters..........................................................................28 Continued data service after loss of one node with MetroCluster...................29 Advantages of stretch MetroCluster configurations ........................................29 Stretch MetroCluster configuration .................................................................29 4 | Data ONTAP 7.3 Active/Active Configuration Guide Stretch MetroCluster configuration on 31xx systems ....................................31 How Data ONTAP works with stretch MetroCluster configurations ..............31 Stretch MetroCluster and disk ownership........................................................31 Setup requirements and restrictions for stretch MetroCluster configurations ......................................................................32 Configuration v ariations for stretch MetroCluster configurations ..................32 MetroClusters and SnapLock volumes............................................................33 Understanding fabric-attached MetroClusters.............................................................33 Fabric-attached MetroClusters use Brocade Fibre Channel switches.............34 Advantages of fabric-attached MetroCluster configurations ...........................34 Fabric-attached MetroCluster configuration ....................................................35 Fabric-attached MetroCluster configuration on 31xx systems ........................35 How Data ONTAP works with fabric-attached MetroCluster configurations ......................................................................36 Setup requirements and restrictions for fabric-attached MetroClusters..........36 Configuration limitations for f abric-attached MetroClusters..........................38 Configuration v ariations for fabric-attached MetroClusters............................38 MetroClusters and SnapLock volumes............................................................39 Active/active configuration installation ......................................................41 System cabinet or equipment rack installation............................................................41 Active/active configurations in an equipment rack .........................................41 Active/active configurations in a system cabinet .............................................42 Required documentation, tools, and equipment..........................................................42 Required documentation..................................................................................42 Required tools..................................................................................................43 Required equipment.........................................................................................44 Preparing your equipment...........................................................................................44 Installing the nodes in equipment racks..........................................................45 Installing the nodes in a system cabinet..........................................................45 Cabling nodes and DS14mk2 AT, DS14mk2 FC, or DS14mk4 FC disk shelves in standard or mirrored active/active configurations .........................46 Systems with two controllers in the same chassis...........................................46 Which Fibre Channel ports to use for DS14mk2 or DS14mk4 FC disk shelf connections.........................................................46 Cabling a standard active/active configuration ................................................47 Cabling a mirrored active/active configuration ...............................................50 Table of Contents | 5 Required connections for using uninterruptible power supplies with standard or mirrored active/active configurations ..........................................57 MetroCluster installation.............................................................................59 Required documentation, tools, and equipment..........................................................59 Required documentation..................................................................................59 Required tools..................................................................................................61 Required equipment.........................................................................................61 MetroCluster and software-based disk ownership.......................................................62 Converting an active/active configuration to a f abric-attached MetroCluster.............63 Upgrading an existing MetroCluster...........................................................................65 Cabling a stretch MetroCluster....................................................................................67 Cabling a stretch MetroCluster between 31xx systems...............................................67 Cabling a fabric-attached MetroCluster.......................................................................68 Planning the fabric-attached MetroCluster installation...................................69 Configuration dif ferences for fabric-attached MetroClusters on 31xx systems.................................................................70 Configuring the switches .................................................................................70 Cabling Node A...............................................................................................72 Cabling Node B...............................................................................................81 Assigning disk pools (if you have software-based disk ownership)................91 Verifying disk paths.........................................................................................92 Required connections for using uninterruptible power supplies with MetroCluster configurations ..........................................................................93 Reconfiguring an acti ve/active configuration into tw o stand-alone systems..................................................................................95 Ensure uniform disk ownership within disk shelves and loops in the system...............................................................................................................95 Disabling the active/actve software.............................................................................96 Reconfiguring nodes using disk shelv es for stand-alone operation.............................97 Requirements when changing an node using array LUNs to stand-alone...................99 Reconfiguring nodes using array LUNs for stand-alone operation .............................99 Configuring an acti ve/active configuration ..............................................103 Bringing up the active/active configuration ...............................................................103 Considerations for active/active configuration setup .....................................103 Configuring shared interf aces with setup......................................................104 Configuring dedicated interf aces with setup.................................................105 6 | Data ONTAP 7.3 Active/Active Configuration Guide Configuring standby interf aces with setup....................................................105 Enabling licenses.......................................................................................................106 Setting options and parameters..................................................................................107 Option types for active/active configurations ................................................107 Setting matching node options......................................................................107 Parameters that must be the same on each node............................................108 Disabling the change_fsid option in MetroCluster configurations ................108 Configuration of the hw_assist option ...........................................................110 Configuration of netw ork interfaces..........................................................................112 What the networking interfaces do................................................................113 IPv6 considerations in an active/active configuration ...................................113 Configuring netw ork interfaces for active/active configurations ..................114 Configuring partner addresses on dif ferent subnets (MetroClusters only)................................................................................119 Testing takeover and giveback...................................................................................123 Management of takeover and giveback....................................................125 How takeover and giveback work..............................................................................125 When takeovers occur....................................................................................125 What happens during takeover......................................................................126 What happens after takeover..........................................................................126 What happens during giveback......................................................................127 Management of an active/active configuration in normal mode ...............................127 Monitoring active/active configuration status ...............................................127 Monitoring the hardware-assisted takeover feature.......................................128 Description of active/active configuration status messages ...........................130 Displaying the partner's name........................................................................131 Displaying disk and array LUN information on an active/active configuration .......................................................................131 Enabling and disabling takeover....................................................................132 Enabling and disabling automatic takeover of a panicked partner................132 Halting a node without takeover....................................................................133 Configuration of when tak eover occurs.....................................................................133 Reasons for takeover......................................................................................133 Commands for performing a takeover...........................................................135 Specifying the time period before takeover...................................................136 How disk shelf comparison takeover works..................................................137 Table of Contents | 7 Configuring VIFs or interfaces for automatic takeover.................................137 Takeover of vFiler units and the vFiler unit limit..........................................137 Managing an active/active configuration in tak eover mode......................................138 Determining why takeover occurred..............................................................138 Statistics in takeover mode............................................................................138 Managing emulated nodes.........................................................................................139 Management exceptions for emulated nodes.................................................139 Accessing the emulated node from the takeover node..................................139 Assessing the emulated node remotely..........................................................141 Emulated node command exceptions............................................................141 Performing dumps and restores for a failed node......................................................143 Giveback operations..................................................................................................144 Performing a giveback...................................................................................144 Configuring gi veback....................................................................................147 Enabling automatic giveback.........................................................................148 Downloading and running the HA Configuration Check er utility............................149 Troubleshooting takeover or giveback failures..........................................................149 Management of DS14mk2 AT, DS14mk2 FC, or DS14mk4 FC disk shelves in an active/active configuration ..............151 Managing disk shelves in Multipath Storage configurations ....................................151 What Multipath Storage for active/active configurations is ..........................151 How the connection types are used...............................................................152 Advantages of Multipath Storage for active/active configurations ...............153 Requirements for Multipath Storage.............................................................153 Determining whether your AT-FCX modules support Multipath Storage.....................................................................................155 Cabling for Multipath Storage.......................................................................156 Adding storage to a Multipath Storage loop..................................................157 Adding disk shelves to non-Multipath Storage configurations .................................159 Overview of adding storage to non-multipath configurations .......................159 Adding storage to an existing non-multipath loop........................................161 Adding a new non-multipath loop.................................................................163 Adding storage to fabric-attached MetroClusters..........................................164 Upgrading or replacing modules in an active/active configuration ...........................164 About the disk shelf modules........................................................................165 Restrictions for changing module types........................................................165 8 | Data ONTAP 7.3 Active/Active Configuration Guide Best practices for changing module types.....................................................166 Testing the modules.......................................................................................166 Understanding redundant pathing in active/active configurations .................167 Determining path status for your active/active configuration ........................167 Upgrading an LRC module to an ESH or ESH2 module..............................169 Hot-swapping a module.................................................................................171 Disaster recovery using MetroCluster......................................................173 Conditions that constitute a disaster..........................................................................173 Ways to determine whether a disaster occurred............................................173 Failures that do not require disaster recovery................................................174 Recovering from a disaster........................................................................................175 Restricting access to the disaster site node....................................................175 Forcing a node into takeover mode................................................................176 Remounting volumes of the failed node........................................................177 Recovering LUNs of the failed node.............................................................177 Fixing failures caused by the disaster............................................................178 Reestablishing the MetroCluster configuration .............................................179 Nondisruptive hardware changes..............................................................185 Replacing a component nondisruptively....................................................................185 Removing the old hardware when nondisruptively changing hardware...................................................................................186 Installing the new hardware when nondisruptively changing hardware ..................................................................................187 Controller failover and single-points-of-failure.......................................189 Single-point-of-failure definition ...............................................................................189 SPOF analysis for active/active configurations .........................................................189 Failover event cause-and-effect table.........................................................................192 Feature update record................................................................................199 Abbreviations..............................................................................................203 Index.............................................................................................................217 Copyright information | 9 Copyright information Copyright © 1994–2009 NetApp, Inc. 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