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<p>Data ONTAP 7.3 Active/Active Configuration Guide</p> <p>NetApp, Inc. 495 East Java Drive Sunnyvale, CA 94089 USA Telephone: +1 (408) 822-6000 Fax: +1 (408) 822-4501 Support telephone: +1 (888) 4-NETAPP Documentation comments: doccomments@netapp.com Information Web: http://www. netapp.com Part number 210-04192_A0 Updated for Data ONTAP 7.3 in June 2008</p> <p>Table of Contents | 3</p> <p>ContentsCopyright information...................................................................................9 Trademark information...............................................................................13 About this guide............................................................................................15Audience......................................................................................................................15 Terminology.................................................................................................................16 Command, keyboard, and typographic conventions....................................................17 Special messages.........................................................................................................18</p> <p>Active/active configurations and requirements..........................................19Overview of active/active configurations....................................................................19 What an active/active configuration is.............................................................19 Benefits of active/active configuration............................................................20 Characteristics of nodes in an active/active configuration..............................20 Using best practices when deploying active/active configurations.................21 Comparison of active/active configuration types............................................21 Standard active/active configurations..........................................................................22 How Data ONTAP works with standard active/active configurations.............23 Standard active/active configuration diagram.................................................23 Setup requirements and restrictions for standard active/active configurations.......................................................................24 Configuration variations 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 variations for mirrored active/active configurations................27 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 Stretch MetroCluster configuration in dual-controller systems ......................................................................................................30 How Data ONTAP works with stretch MetroCluster configurations..............31</p> <p>4 | Data ONTAP 7.3.0 Active/Active Configuration Guide Stretch MetroCluster and disk ownership........................................................31 Setup requirements and restrictions for stretch MetroCluster configurations......................................................................32 Configuration variations for stretch MetroCluster configurations..................32 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....................................................34 Fabric-attached MetroCluster configuration with dual-controller systems..............................................................................35 How Data ONTAP works with fabric-attached MetroCluster configurations......................................................................37 Setup requirements and restrictions for fabric-attached MetroClusters..........37 Configuration limitations for fabric-attached MetroCluster configurations............................................................................................39 Configuration variations for fabric-attached MetroCluster configurations............................................................................................40</p> <p>Active/active installation..............................................................................41System cabinet or equipment rack installation............................................................41 Active/active configurations in an equipment rack.........................................41 Active/active configurations in a system cabinet.............................................41 Required documentation, tools, and equipment..........................................................42 Required documentation..................................................................................42 Required tools..................................................................................................43 Required equipment.........................................................................................43 Preparing your equipment...........................................................................................44 Installing the nodes in equipment racks..........................................................44 Installing the nodes in a system cabinet..........................................................45 Cabling procedures for standard or mirrored active/active configurations.................45 Systems with two controllers in the same chassis...........................................46 Which Fibre Channel ports to use for an active/active configuration.............46 Cabling a standard active/active configuration................................................47 Cabling a mirrored active/active configuration...............................................50 About using a UPS with standard or mirrored active/active configurations...............58</p> <p>MetroCluster installation.............................................................................61Required documentation, tools, and equipment..........................................................61</p> <p>Table of Contents | 5 Required documentation..................................................................................61 Required tools..................................................................................................63 Required equipment.........................................................................................63 MetroCluster and software-based disk ownership.......................................................64 Converting an active/active configuration to a fabric-attached MetroCluster.............65 Upgrading an existing fabric-attached MetroCluster..................................................67 Cabling a stretch MetroCluster....................................................................................69 Cabling a stretch MetroCluster between dual-controller systems...............................69 Cabling a fabric-attached MetroCluster.......................................................................70 Planning the fabric-attached MetroCluster installation...................................71 Configuration differences for fabric-attached MetroClusters on dual-controller systems.................................................73 Configuring the switches.................................................................................73 Cabling Node A...............................................................................................74 Cabling Node B...............................................................................................84 Assigning disk pools (if you have software-based disk ownership)................94 Verifying disk paths.........................................................................................95 About using a UPS with MetroCluster configurations................................................97</p> <p>Configuring an active/active configuration................................................99Bringing up the active/active configuration.................................................................99 Considerations for active/active configuration setup.......................................99 Configuring shared interfaces with setup......................................................100 Configuring dedicated interfaces with setup.................................................101 Configuring standby interfaces with setup....................................................101 Enabling licenses.......................................................................................................102 Setting options and parameters..................................................................................103 Option types for active/active configurations................................................103 Setting matching node options......................................................................104 Parameters that must be the same on each node............................................104 Disabling the change_fsid option in MetroCluster configurations................105 Configuration of the hw_assist option...........................................................105 Configuration of network interfaces..........................................................................108 What the networking interfaces do................................................................108 Configuring network interfaces for the active/active configuration..............108 Testing takeover and giveback...................................................................................109</p> <p>Management of an active/active configuration........................................111</p> <p>6 | Data ONTAP 7.3.0 Active/Active Configuration Guide How takeover and giveback work..............................................................................111 When takeovers occur....................................................................................111 What happens during takeover......................................................................112 What happens after takeover..........................................................................112 What happens during giveback......................................................................113 Management of an active/active configuration in normal mode...............................113 Monitoring active/active configuration status...............................................113 Monitoring the hardware-assisted takeover feature.......................................114 Description of active/active configuration status messages...........................116 Displaying the partner's name........................................................................117 Displaying disk information on an active/active configuration.....................118 Enabling and disabling takeover....................................................................118 Enabling and disabling immediate takeover of a panicked partner...............118 Halting a node without takeover....................................................................119 Commands for performing a takeover...........................................................119 Configuration of when takeover occurs.....................................................................120 Reasons for takeover......................................................................................121 Specifying the time period before takeover...................................................122 How disk shelf comparison takeover works..................................................123 Configuring VIFs or interfaces for automatic takeover.................................123 Managing an active/active configuration in takeover mode......................................124 Determining why takeover occurred..............................................................124 Statistics in takeover mode............................................................................124 Management of emulated nodes................................................................................125 Management exceptions for emulated nodes.................................................125 Assessing the emulated node from the takeover node...................................125 Assessing the emulated node remotely..........................................................127 Emulated node command exceptions............................................................128 Performing dumps and restores for a failed node......................................................130 Giveback operations..................................................................................................131 Performing a giveback...................................................................................131 Configuring giveback....................................................................................133 Enabling automatic giveback.........................................................................135 Configuring network interfaces for active/active configurations..............................135 Understanding interfaces in an active/active configuration...........................135 Making nondisruptive changes to the virtual interfaces................................139</p> <p>Table of Contents | 7 Configuring dedicated and standby interfaces...............................................139 Downloading and running the Cluster Configuration Checker utility.......................141 Troubleshooting takeover or giveback failures..........................................................141 Removing an active/active configuration..................................................................142 Ensure uniform disk ownership within disk shelves and loops in the system...................................................................................142 Disabling the software...................................................................................143 Reconfiguring hardware for stand-alone operation.......................................144</p> <p>Management of storage in an active/active configuration.....</p>