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Data ONTAP 81 Storage Management Guide for 7Mode

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Data ONTAP® 8.1 Storage Management Guide For 7-Mode NetApp, Inc. 495 East Java Drive Sunnyvale, CA 94089 U.S.A. Telephone: +1 (408) 822-6000 Fax: +1 (408) 822-4501 Support telephone: +1 (888) 4-NETAPP Documentation comments: doccomments@netapp.com Information Web: www.netapp.com Part number: 210-05793_C0 Updated for Data ONTAP 8.1.2 on 24 February 2014 Contents Data ONTAP storage architecture overview ........................................... 16 Managing disks using Data ONTAP ..............
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  Data ONTAP® 8.1 Storage Management Guide For 7-Mode NetApp, Inc.495 East Java DriveSunnyvale, CA 94089 U.S.A.Telephone: +1 (408) 822-6000Fax: +1 (408) 822-4501Support telephone: +1 (888) 4-NETAPPDocumentation comments: doccomments@netapp.comInformation Web: www.netapp.comPart number: 210-05793_C0Updated for Data ONTAP 8.1.2 on 24 February 2014  Contents Data ONTAP storage architecture overview ........................................... 16Managing disks using Data ONTAP ......................................................... 17 How Data ONTAP reports disk types ....................................................................... 17Storage connection architectures and topologies supported by Data ONTAP .......... 19How disks can be combined for the SAS disk connection type .................... 19How disks can be combined for the FC-AL disk connection type ................ 19Usable and physical disk capacity by disk size ......................................................... 19Methods of calculating aggregate and system capacity ............................................ 21Disk speeds supported by Data ONTAP ................................................................... 21How disk checksum types affect aggregate and spare management ......................... 22Checksum type by Data ONTAP disk type ............................................................... 22Drive name formats ................................................................................................... 23Loop IDs for FC-AL connected disks ........................................................... 25Understanding RAID disk types ............................................................................... 25How disk sanitization works ..................................................................................... 25Disk sanitization process ............................................................................... 26When disk sanitization cannot be performed ................................................ 26What happens if disk sanitization is interrupted ........................................... 27How selective disk sanitization works .......................................................... 27Tips for creating and backing up aggregates containing data to besanitized ................................................................................................... 28How Data ONTAP monitors disk performance and health ....................................... 28When Data ONTAP takes disks offline temporarily ..................................... 28How Data ONTAP reduces disk failures using Rapid RAID Recovery ....... 28How the maintenance center helps prevent drive errors ............................... 29How Data ONTAP uses continuous media scrubbing to prevent mediaerrors ........................................................................................................ 31Increasing storage availability by using ACP ........................................................... 31Enabling ACP ................................................................................................ 32How you use SSDs to increase storage performance ................................................ 33How Data ONTAP manages SSD wear life .................................................. 34Capability differences between SSDs and HDDs ......................................... 35Table of Contents | 3  Guidelines and requirements for using multi-disk carrier storage shelves ............... 35How 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 ................. 36Spare requirements for multi-disk carrier disks ............................................ 37Shelf  configuration requirements for multi-disk carrier disk shelves ........... 37Aggregate requirements for disks in multi-disk carrier storage shelves ....... 37Considerations for using disks from a multi-disk carrier storage shelf inan aggregate ............................................................................................. 38Adding disk s to a storage system .............................................................................. 38Replacing disks that are currently being used in an aggregate ................................. 40Replacing a self-encrypting disk ............................................................................... 41Converting a data disk to a hot spare ........................................................................ 42Removing disks from a storage system ..................................................................... 42Removing a failed disk .................................................................................. 42Removing a hot spare disk ............................................................................ 43Removing a data disk .................................................................................... 44Using disk sanitization to remove data from disks ................................................... 45Removing data from disks using selective disk sanitization ......................... 47Stopping disk sanitization ............................................................................. 53 How ownership for disks and array LUNs works ................................... 54 Reasons to assign ownership of disks and array LUNs ............................................ 54What it means for Data ONTAP to own an array LUN ............................................ 54Why you might assign array LUN ownership after installation ................................ 55How disks and array LUNs become available for use .............................................. 56How automatic ownership assignment works for disks ............................................ 57What automatic ownership assignment does ................................................ 57When automatic ownership assignment is invoked ...................................... 57How disk ownership works for platforms based on Data ONTAP-v technology ..... 58Examples showing when Data ONTAP can use array LUNs ................................... 58 Managing ownership for disks and array LUNs ..................................... 61 Guidelines for assigning ownership for disks ........................................................... 61Assigning ownership for unowned disks and array LUNs ........................................ 61Modifying assignment of spare disks or array LUNs ............................................... 63Verifying the existence of two paths to an array LUN ............................................. 65Verifying the existence of two paths: storage show disk command ............. 65 4  | Data ONTAP 8.1 Storage Management Guide for 7-Mode
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