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Data ONTAP 8.2 SAN Administration Guide for 7Mode

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Data ONTAP 8.2 SAN Administration Guide for 7Mode
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  Data ONTAP  ®   8.2 SAN Administration 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: 215-07986_A0May 2013  Contents Preparing for LUN setup workflow ............................................................ 8Deciding which LUN type to use in SAN environments ........................... 9 How the rate of change in your data determines LUN type ........................................ 9Calculating Rate of Change ........................................................................... 10Additional considerations for thinly provisioned LUNs ........................................... 11What LUN thin provisioning is ..................................................................... 11Why thinly provisioned LUNs go offline ..................................................... 12How to keep your thinly provisioned LUNs online ...................................... 12When to use thinly provisioned LUNs .......................................................... 18Additional considerations for space-reserved LUNs ................................................ 18What space-reserved LUNs are ..................................................................... 18When to use space-reserved LUNs with Snapshot reserve ........................... 18When to use space-reserved LUNs without Snapshot reserve ...................... 19Space-reserved LUNs with Snapshot reserve ............................................... 20Space-reserved LUNs in a thinly provisioned volume .................................. 20 Storage Provisioning for SAN ................................................................... 21 Storage units for managing disk space ...................................................................... 21Guidelines for provisioning storage in a SAN environment ..................................... 22Estimating storage in a SAN environment ................................................................ 23How much room do you need for Snapshot copies ....................................... 23Determining the volume size when using Snapshot autodelete .................... 24Determining the volume size and fractional reserve setting when youneed Snapshot copies ............................................................................... 25Determining the volume size when you do not need Snapshot copies ......... 27Creating LUNs on storage systems ........................................................................... 28Creating an aggregate .................................................................................... 28Creating a volume ......................................................................................... 29Volume configuration options for a SAN environment ................................ 30Conf iguring volumes in a SAN environment ................................................ 34Setting up LUNs and igroups ........................................................................ 44Creating LUNs on vFiler units .................................................................................. 46Displaying vFiler LUNs ................................................................................ 48Table of Contents | 3  LUN configuration .................................................................................................... 48Information required to create a LUN ........................................................... 48Guidelines for LUN layout and space allocation .......................................... 51LUN management ..................................................................................................... 52Displaying command-line Help for LUNs .................................................... 52Controlling LUN availability ........................................................................ 53Moving LUNs ............................................................................................... 54Modifying LUN descriptions ........................................................................ 54How LUN reservations work ........................................................................ 54Enabling or disabling space reservations for LUNs ...................................... 55Accessing LUNs with NAS protocols ........................................................... 56Checking LUN, igroup, and FC settings ....................................................... 56Displaying LUN serial numbers .................................................................... 57Displaying LUN statistics ............................................................................. 58Displaying LUN mapping information ......................................................... 59Displaying detailed LUN information ........................................................... 59Displaying hidden staging area LUNs .......................................................... 60LUN alignment in virtual environments ....................................................... 60Removing LUNs ........................................................................................... 61Misaligned I /O can occur on properly aligned LUNs ................................... 61 igroup management .................................................................................... 63 What igroups are ....................................................................................................... 63igroup example .............................................................................................. 63Creating igroups ........................................................................................................ 64Required inf ormation for creating igroups .................................................... 65Creating FC protocol igroups on UNIX hosts using the sanlun command ... 66Creating igroups for a non-default vFiler unit .............................................. 67igroup configuration .................................................................................................. 68Enabling ALUA ............................................................................................ 68Enabling report_scsi_name ........................................................................... 69Fibre Channel initiator request management ................................................ 70LUN and igroup mapping ......................................................................................... 75What LUN mapping is .................................................................................. 75Required inf ormation for mapping a LUN to an igroup ............................... 75Guidelines f or mapping LUNs to igroups ..................................................... 76SnapMirror destinations and read-only LUNs .............................................. 76 4  | SAN Administration Guide
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