Ontap Admin Guide 7.3

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<p>Data ONTAP 7.3 Storage Management 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: 210-04497_A0 Updated for Data ONTAP 7.3.2 on 17 August 2009</p> <p>Table of Contents | 3</p> <p>ContentsCopyright information.................................................................................15 Trademark information...............................................................................17 About this guide............................................................................................19Audience......................................................................................................................19 Accessing Data ONTAP man pages............................................................................19 Terminology.................................................................................................................20 Where to enter commands...........................................................................................21 Keyboard and formatting conventions.........................................................................22 Special messages.........................................................................................................23 How to send your comments.......................................................................................23</p> <p>Data ONTAP storage architecture overview..............................................25 How Data ONTAP works with disks...........................................................27What disk types Data ONTAP supports......................................................................27 Disk connection architectures......................................................................................28 Fibre Channel Arbitrated Loop (FC-AL) disk connection architecture...........28 Serial attached SCSI (SAS) disk connection architecture...............................28 Available disk capacity by disk size............................................................................28 Disk speeds..................................................................................................................30 Disk formats................................................................................................................30 Disk names..................................................................................................................31 Loop IDs for FC-AL connected disks.............................................................32 RAID disk types..........................................................................................................32 How disk sanitization works........................................................................................33 Disk sanitization limitations............................................................................34 What happens if disk sanitization is interrupted..............................................34 How selective disk sanitization works.............................................................35 Commands to display disk and array LUN information..............................................35 Commands to display disk space information.............................................................37 How Data ONTAP monitors disk performance and health.........................................37 When Data ONTAP takes disks offline temporarily.......................................37 How Data ONTAP reduces disk failures using Rapid RAID Recovery..........................................................................................38</p> <p>4 | Data ONTAP 7.3 Storage Management Guide How the maintenance center works.................................................................39 How Data ONTAP uses continuous media scrubbing to prevent media errors...................................................................................40 How Data ONTAP uses ACP to increase storage availability.....................................41 Enabling ACP..................................................................................................41 The ACP subnet...............................................................................................42</p> <p>How ownership for disks and array LUNs works......................................45How software-based ownership works........................................................................45 Why you assign ownership of disks and array LUNs......................................46 What it means for Data ONTAP to own an array LUN...................................46 Why you might assign array LUN ownership after installation......................47 How disks and array LUNs become available for use.....................................47 How ownership autoassignment works for disks.............................................49 Examples showing when Data ONTAP can use array LUNs..........................49 How hardware-based disk ownership works...............................................................51 Data ONTAP automatically recognizes and assigns disks for hardware-based disk ownership...........................................................52 How disks are assigned to spare pools when SyncMirror is enabled..........................53 Storage system models that support hardware-based ownership or both types...............................................................................................................53 When a storage system uses software-based disk ownership..........................54</p> <p>Managing ownership for disks and array LUNs........................................55Guidelines for assigning ownership for disks..............................................................55 Displaying ownership information..............................................................................55 Assigning ownership for disks and array LUNs..........................................................57 Modifying assignment of spare disks or array LUNs..................................................59 How you use the wildcard character with the disk command.....................................60 Determining whether a system has hardware-based or software-based disk ownership..............................................................................61 Changing between hardware-based and software-based ownership............................62 Changing from hardware-based to software-based disk ownership nondisruptively.........................................................................62 Changing from hardware-based to software-based disk ownership using the standard method........................................................63 Changing from software-based to hardware-based disk ownership for stand-alone systems............................................................64</p> <p>Table of Contents | 5 About changing from software-based to hardware-based disk ownership for active/active configurations.........................................65 Reusing disks configured for software-based disk ownership.....................................65 Automatically erasing disk ownership information.........................................66 Manually erasing software-based disk ownership information.......................66 Recovering from accidental conversion to software-based disk ownership...........................................................................................67</p> <p>Managing disks.............................................................................................69Adding disks to a storage system................................................................................69 Replacing disks that are currently being used in an aggregate....................................70 Converting a data disk to a hot spare...........................................................................71 Removing disks from a storage system.......................................................................72 Removing a failed disk....................................................................................72 Removing a hot spare disk...............................................................................72 Removing a data disk.......................................................................................73 Removing data from disks using disk sanitization......................................................74 Removing data from disks using selective disk sanitization...........................76 Stopping disk sanitization............................................................................................82</p> <p>Managing array LUNs through Data ONTAP...........................................83Array LUN name format.............................................................................................83 Why you might change the checksum type of an array LUN......................................84 Changing the checksum type of an array LUN...........................................................85 Prerequisites to reconfiguring a LUN on the storage array.........................................85 Changing array LUN size or composition...................................................................86 Removing one array LUN from use by Data ONTAP.................................................87 Removing a storage system using array LUNs from service......................................88</p> <p>Commands to display information about your storage.............................89Commands to display disk and array LUN information..............................................89 Commands to display disk space information.............................................................90 Commands to display storage subsystem information................................................91</p> <p>Enabling or disabling a host adapter..........................................................93 How Data ONTAP uses RAID to protect your data and data availability........................................................................................95RAID protection levels for disks.................................................................................95 What RAID-DP protection is..........................................................................96</p> <p>6 | Data ONTAP 7.3 Storage Management Guide What RAID4 protection is...............................................................................96 RAID protection for third-party storage......................................................................97 Protection provided by RAID and SyncMirror...........................................................97 RAID disk types..........................................................................................................99 How Data ONTAP RAID groups work.....................................................................100 How RAID groups are named.......................................................................100 About RAID group size.................................................................................100 Considerations for sizing RAID groups for disks.........................................101 Considerations for Data ONTAP RAID groups for array LUNs...................101 Maximum number of RAID groups..............................................................102 How Data ONTAP works with hot spare disks.........................................................103 How many hot spares you should have..........................................................103 What disks can be used as hot spares............................................................103 What a matching spare is...............................................................................103 What an appropriate hot spare is...................................................................104 About degraded mode....................................................................................104 About low spare warnings.............................................................................105 How Data ONTAP handles a failed disk with a hot spare.........................................105 How Data ONTAP handles a failed disk that has no available hot spare..................107 How Data ONTAP handles media errors during reconstruction...............................108 How RAID-level disk scrubs verify data integrity....................................................108 How you schedule automatic RAID-level scrubs..........................................108 How you run a manual RAID-level scrub.....................................................109</p> <p>Customizing the size of your RAID groups..............................................111 Controlling the impact of RAID operations on system performance....113Controlling the performance impact of RAID data reconstruction...........................114 Controlling the performance impact of RAID-level scrubbing.................................114 Controlling the performance impact of plex resynchronization................................115 Controlling the performance impact of mirror verification.......................................116</p> <p>How aggregates work.................................................................................119How unmirrored aggregates work.............................................................................119 How mirrored aggregates work.................................................................................121 Aggregate states and status........................................................................................122 How you can use disks with mixed speeds in the same aggregate............................124 How to control disk selection from heterogeneous storage.......................................124 Rules for mixing disk types in aggregates.................................................................125</p> <p>Table of Contents | 7 Rules for mixing array LUNs in an aggregate...........................................................126 Checksum rules for adding storage to an aggregate..................................................126 What happens when you add larger disks to an aggregate........................................127</p> <p>Managing aggregates..................................................................................129Creating an aggregate................................................................................................129 Increasing the size of an aggregate ...........................................................................132 What happens when you add storage to an aggregate...................................134 Forcibly adding disks to aggregates..........</p>

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