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Data ONTAP® 8.1 Data Protection Online Backup and Recovery Guide For 7-Mode Net

Data ONTAP® 8.1 Data Protection Online Backup and Recovery Guide For 7-Mode NetApp, Inc. 495 East Java Drive Sunnyvale, CA 94089 U.S. Telephone: +1 (408) 822-6000 Fax: +1 (408) 822-4501 Support telephone: +1 (888) 463-8277 Web: www.netapp.com Feedback: doccomments@netapp.com Part number: 210-05510_A0 Updated for Data ONTAP 8.1.1 on 14 June 2012 Contents Introduction to data protection ................................................................. 16 Methods of protecting data ........................................................................................ 16 What online backup and recovery is ......................................................................... 19 Advantages of online backup and recovery .................................................. 20 Disadvantages of online backup and recovery .............................................. 20 Methods for online backup and recovery ...................................................... 20 What the NVFAIL feature is ..................................................................................... 21 What a data loss disaster is ........................................................................................ 21 How to determine a disaster .......................................................................... 21 What tools to use to protect against data-loss disasters ................................ 22 How to protect data in a SAN environment .............................................................. 24 Policy-based automated data protection using the NetApp Management Console data protection capability .................................................................................... 24 Interoperability between volumes in 32-bit and 64-bit aggregates ........................... 25 Data replication using aggr copy .............................................................. 26 Copying one aggregate to another aggregate using the aggr copy command ........... 26 Snapshot management ............................................................................... 28 What a Snapshot copy is ........................................................................................... 28 How Snapshot copies handle file permissions .............................................. 28 What you can do with Snapshot copies ......................................................... 29 User access to Snapshot copies ................................................................................. 29 Access to Snapshot copies over NFS ............................................................ 29 Access to Snapshot copies over CIFS ........................................................... 31 Accessing Snapshot copies from CIFS clients .............................................. 31 Restricting access to Snapshot copies ........................................................... 32 How Data ONTAP Snapshot copies work in an iSCSI or FC network .................... 32 Using Snapshot copies in the SAN environment .......................................... 33 Relationship between a LUN and a Snapshot copy ...................................... 34 Restoring files from Snapshot copies ........................................................................ 34 Snapshot restoration using Shadow Copy Client tools ................................. 34 Creation of Snapshot copy schedules ........................................................................ 35 User-specified Snapshot copy schedules ....................................................... 35 Table of Contents | 3 Snapshot copy schedule conflicts .................................................................. 36 If scheduled Snapshot copy creation fails ..................................................... 36 Viewing the Snapshot copy schedule using the CLI ..................................... 37 What the snap sched command arguments mean .......................................... 38 Strategies for creating a Snapshot copy schedule ......................................... 38 Changing the Snapshot copy schedule .......................................................... 39 Enabling or disabling automatic Snapshot copies ......................................... 40 Creating Snapshot copies manually .......................................................................... 41 Why you might need to access a particular Snapshot copy ...................................... 41 Finding the Snapshot copy you need from an NFS client ............................. 41 Determining access times from an NFS client .............................................. 42 Finding the Snapshot copy you need from a CIFS client .............................. 42 How to determine access times from a CIFS client ...................................... 43 What Snapshot disk consumption is .......................................................................... 43 How Snapshot copies consume disk space ................................................... 43 How changing file content consumes disk space .......................................... 44 Monitoring Snapshot copy disk consumption ............................................... 45 Displaying Snapshot copy disk consumption statistics ................................. 46 What the Snapshot copy reserve is ................................................................ 49 Changing the Snapshot copy reserve ............................................................ 51 What file folding means and how it saves disk space ............................................... 52 Enabling file folding ...................................................................................... 52 Displaying the rate of change between Snapshot copies ........................................... 52 Displaying rates of change between Snapshot copies ................................... 53 Deleting Snapshot copies automatically ................................................................... 54 Deleting Snapshot copies automatically without options ............................. 56 Viewing settings for the automatic deletion of Snapshot copies .................. 57 Restoring the default settings for the automatic deletion of Snapshot copies ....................................................................................................... 57 Disabling a policy for automatic deletion of Snapshot copies ...................... 58 Displaying space reclaimed from deleted Snapshot copies ...................................... 58 How to determine which Snapshot copies to delete on the basis of size .................. 59 Deleting a Snapshot copy manually .............................................................. 59 Manual deletion of a busy or locked Snapshot copy ..................................... 60 Renaming Snapshot copies ........................................................................................ 61 Volume move and snap commands ........................................................................... 61 4 | Data ONTAP 8.1 Data Protection Online Backup and Recovery Guide for 7-Mode Data recovery using SnapRestore ............................................................. 63 What SnapRestore is ................................................................................................. 63 What SnapRestore does ................................................................................. 63 When to use SnapRestore .......................................................................................... 64 Considerations before using SnapRestore ..................................................... 64 Prerequisites for using SnapRestore .............................................................. 65 General cautions for using SnapRestore ....................................................... 65 Caution about reverting the root volume ....................................................... 66 Preserving configuration files ....................................................................... 66 Reverting a root volume before using SnapRestore ...................................... 66 Installing the SnapRestore license ............................................................................. 66 Reverting a volume to a selected Snapshot copy ...................................................... 67 Reverting a file to a selected Snapshot copy ............................................................. 69 Obtaining correct incremental backups after reversion ............................................. 72 Data protection using SnapMirror ........................................................... 73 How SnapMirror works ............................................................................................. 73 Applications of SnapMirror ...................................................................................... 74 What synchronous SnapMirror is .............................................................................. 75 Synchronous SnapMirror modes ................................................................... 75 How SnapMirror replicates data synchronously ........................................... 76 How synchronous SnapMirror handles network issues ................................ 76 Guidelines for growing an aggregate with a synchronous SnapMirror destination volume ................................................................................... 77 Enabling SnapMirror by entering license codes ....................................................... 77 Turning SnapMirror on ................................................................................. 78 Considerations for the use of SnapMirror ................................................................. 78 Prerequisites for SnapMirror ......................................................................... 78 Volume SnapMirror interoperability matrix ................................................. 79 Restrictions while using SnapMirror ............................................................. 81 Points of caution while using SnapMirror ..................................................... 82 Symmetrical disk geometry ........................................................................... 83 Recommended actions while using SnapMirror ........................................... 83 Deduplication with volume SnapMirror ....................................................... 84 Data compression with qtree SnapMirror ..................................................... 84 Possible conflicts between SnapMirror operation and Snapshot copy schedule ................................................................................................... 85 Table of Contents | 5 Destination accessibility when using CIFS with SnapMirror ....................... 85 Considerations before using synchronous SnapMirror ............................................. 86 Disk types for a V-Series system using synchronous and semi- synchronous SnapMirror ......................................................................... 87 Estimating aggregate size for synchronous SnapMirror destination volumes .................................................................................................... 87 Deployment of SnapMirror ....................................................................................... 88 Supported SnapMirror configurations ........................................................... 89 Comparison between volume SnapMirror and qtree SnapMirror ................. 89 SnapMirror deployment variations ................................................................ 90 Migration from traditional volumes to FlexVol volumes ............................. 92 SnapMirror commands .................................................................................. 92 SnapMirror options ....................................................................................... 95 SnapMirror files ............................................................................................ 97 SnapMirror support for IPv6 ......................................................................... 99 Setting up a basic SnapMirror operation ..................................................... 100 Firewall usage with SnapMirror .................................................................. 102 Data replication from one destination to another in a series (cascading) .... 102 Data replication using tape .......................................................................... 108 Initialization of a SnapMirror destination ............................................................... 111 Quotas for SnapMirror destination qtrees ................................................... 111 Guidelines for creating a qtree SnapMirror relationship ............................. 112 Initialization of a SnapMirror destination from tape ................................... 112 Initializing a SnapMirror destination .......................................................... 112 Space guarantee for a volume SnapMirror destination ............................... 114 Initializing a destination for non-qtree data ................................................ 115 How the snapmirror initialize command copies volumes ........................... 115 How the snapmirror initialize command copies qtrees ............................... 116 What happens after SnapMirror makes the initial copy to the destination . 116 How to check the initialization of a volume ............................................... 116 Checking the initialization of a qtree .......................................................... 117 How the snapmirror initialize command matches source and destination volume size ............................................................................................ 117 What you can do if an initial SnapMirror transfer fails .............................. 117 Maximum number of concurrent replication operations ......................................... 118 Maximum number of concurrent replication operations in an HA pair ...... 121 6 | Data ONTAP 8.1 Data Protection Online Backup and Recovery Guide for 7-Mode Methods for specifying destination systems on the SnapMirror source ................. 121 Specifying SnapMirror destinations using the snapmirror.access option ... 121 Specifying SnapMirror destinations using the snapmirror.allow file ......... 122 Resolving host names to their IP addresses ................................................ 123 What the snapmirror.conf file does ......................................................................... 123 Distribution of the snapmirror.conf file ...................................................... 124 Limit on entries in the snapmirror.conf file ................................................ 124 Editing the snapmirror.conf file .................................................................. 124 Syntax for snapmirror.conf file entries ....................................................... 125 Scheduled updates for volumes or qtrees ................................................................ 132 Changing scheduled updates for one volume or qtree ................................ 133 Turning off SnapMirror updates ................................................................. 133 Turning off scheduled updates for one volume or qtree ............................. 134 Manual update of a SnapMirror destination ............................................................ 134 Performing a manual SnapMirror update .................................................... 135 Creating extra backup Snapshot copies for SnapMirror qtrees ................... 136 What happens after SnapMirror makes incremental updates to the destination .............................................................................................. 137 SnapMirror over multiple paths .............................................................................. 137 Setting up a multipath SnapMirror relationship .......................................... 137 Converting a single-path SnapMirror relationship to multipath ................. 138 SnapMirror network compression ........................................................................... 139 Enabling SnapMirror network compression ............................................... 139 Viewing SnapMirror network compression ratio ........................................ 142 Checking SnapMirror data transfer status ............................................................... 143 What SnapMirror status check shows ......................................................... 144 Information messages in the SnapMirror status check ................................ 147 Adjusting the TCP window size for a SnapMirror relationship .............................. 151 Setting a maximum transfer rate for all transfers .................................................... 153 Changing the maximum transfer rate for a single SnapMirror transfer .................. 154 About moving SnapMirror sources ......................................................................... 154 Moving volume SnapMirror sources ........................................................... 155 Moving qtree SnapMirror sources ............................................................... 157 Migrating data between volumes by using SnapMirror .......................................... 158 Conversion of a destination to a writable volume or qtree ..................................... 159 Quota restrictions ........................................................................................ 160 Table of Contents | 7 Converting a SnapMirror destination to a writable volume or qtree ........... 160 After using the snapmirror break command ................................................ 161 Resizing a SnapMirror source and destination volume pair ................................... 161 Converting asynchronous SnapMirror replication to synchronous ......................... 165 Stabilizing destinations before uploads/Management/ snapmirror-guide 1 .pdf