Data ONTAP 7.3 Active/Active Configuration Guide

222 Pages·2009·1.09 MB·English

Data ONTAP® 7.3
Active/Active Configuration Guide
NetApp, Inc.
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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
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