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Data ONTAP 8.2 Storage Management Guide for 7Mode

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Data ONTAP 8.2 Storage Management Guide for 7Mode
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  Data ONTAP  ®   8.2 Storage Management Guide For 7-Mode NetApp, Inc.495 East Java DriveSunnyvale, CA 94089U.S.Telephone: +1 (408) 822-6000Fax: +1 (408) 822-4501Support telephone: +1 (888) 463-8277Web: www.netapp.comFeedback: doccomments@netapp.comPart number: 215-07980_B0October 2013  Contents Data ONTAP storage architecture overview ........................................... 17Managing disks using Data ONTAP ......................................................... 18 How Data ONTAP reports drive types ..................................................................... 18Storage connection architectures and topologies supported by Data ONTAP .......... 20How disks can be combined for the SAS disk connection type .................... 20How disks can be combined for the FC-AL disk connection type ................ 20Usable and physical disk capacity by disk size ......................................................... 20Methods of calculating aggregate and system capacity ............................................ 22Disk speeds supported by Data ONTAP ................................................................... 22How disk checksum types affect aggregate and spare management ......................... 23Checksum type by Data ONTAP disk type ............................................................... 23Drive name formats ................................................................................................... 24Loop IDs for FC-AL connected disks ........................................................... 26Understanding RAID disk types ............................................................................... 26How disk sanitization works ..................................................................................... 26Disk sanitization process ............................................................................... 27When disk sanitization cannot be performed ................................................ 27What happens if disk sanitization is interrupted ........................................... 28How selective disk sanitization works .......................................................... 28Tips for creating and backing up aggregates containing data to besanitized ................................................................................................... 28How Data ONTAP monitors disk performance and health ....................................... 29What happens when Data ONTAP takes disks offline ................................. 29How Data ONTAP reduces disk failures using Rapid RAID Recovery ....... 29How the maintenance center works .............................................................. 30How Data ONTAP uses continuous media scrubbing to prevent mediaerrors ........................................................................................................ 31Increasing storage availability by using ACP ........................................................... 32Enabling ACP ................................................................................................ 33How you use SSDs to increase storage performance ................................................ 34How Data ONTAP manages SSD wear life .................................................. 35Capability differences between SSDs and HDDs ......................................... 35Table of Contents | 3  Guidelines and requirements for using multi-disk carrier disk shelves .................... 36How Data ONTAP avoids RAID impact when a multi-disk carrier mustbe removed .............................................................................................. 36How to determine when it is safe to remove a multi-disk carrier ................. 37Spare requirements for multi-disk carrier disks ............................................ 37Shelf  configuration requirements for multi-disk carrier disk shelves ........... 38Aggregate requirements for disks from multi-disk carrier disk shelves ....... 38Considerations for using disks from a multi-disk carrier disk shelf in anaggregate .................................................................................................. 38Adding disk s to a storage system .............................................................................. 39When you need to update the Disk Qualification Package ........................... 40Replacing disks that are currently being used in an aggregate ................................. 41Replacing a self-encrypting disk ............................................................................... 42Converting a data disk to a hot spare ........................................................................ 43Removing disks from a storage system ..................................................................... 43Removing a failed disk .................................................................................. 43Removing a hot spare disk ............................................................................ 44Removing a data disk .................................................................................... 45Using disk sanitization to remove data from disks ................................................... 46Removing data from disks using selective disk sanitization ......................... 49Stopping disk sanitization ............................................................................. 54 How ownership for disks and array LUNs works ................................... 56 Why you assign ownership of disks and array LUNs ............................................... 56What it means for Data ONTAP to own an array LUN ............................................ 56Why you might assign array LUN ownership after installation ................................ 57How disks and array LUNs become available for use .............................................. 58How automatic ownership assignment works for disks ............................................ 59What automatic ownership assignment does ................................................ 59When automatic ownership assignment is invoked ...................................... 60How disk ownership works for platforms based on Data ONTAP-v technology ..... 60Examples showing when Data ONTAP can use array LUNs ................................... 60 Managing ownership for disks and array LUNs ..................................... 63 Guidelines for assigning ownership for disks ........................................................... 63Assigning ownership for unowned disks and array LUNs ........................................ 64Configuring automatic ownership assignment of disks ............................................ 66Modifying assignment of spare disks or array LUNs ............................................... 67 4  | Storage Management Guide
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