Data ONTAP® 8.0 7-Mode Block Access Management Guide for iSCSI and FC 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: [email protected] Information Web: http://www.netapp.com Part number: 210-05002_A0 Updated for Data ONTAP 8.0.1 on 04 November 2010 Table of Contents | 3 Contents Copyright information ............................................................................... 11 Trademark information ............................................................................. 13 About this guide .......................................................................................... 15 Audience .................................................................................................................... 15 Accessing Data ONTAP man pages .......................................................................... 16 Terminology .............................................................................................................. 16 Where to enter commands ......................................................................................... 17 Keyboard and formatting conventions ...................................................................... 18 Special messages ....................................................................................................... 19 How to send your comments ..................................................................................... 19 Introduction to block access ...................................................................... 21 How hosts connect to storage systems ...................................................................... 21 What Host Utilities are .................................................................................. 21 What ALUA is .............................................................................................. 22 About SnapDrive for Windows and UNIX ................................................... 22 How Data ONTAP implements an iSCSI network ................................................... 23 What iSCSI is ................................................................................................ 23 What iSCSI nodes are ................................................................................... 24 Supported configurations .............................................................................. 24 How iSCSI nodes are identified .................................................................... 25 How the storage system checks initiator node names ................................... 26 Default port for iSCSI ................................................................................... 26 What target portal groups are ........................................................................ 26 What iSNS is ................................................................................................. 27 What CHAP authentication is ....................................................................... 27 How iSCSI communication sessions work ................................................... 28 How iSCSI works with HA pairs .................................................................. 28 Setting up the iSCSI protocol on a host and storage system ......................... 28 How Data ONTAP implements a Fibre Channel SAN ............................................. 29 What FC is ..................................................................................................... 29 What FC nodes are ........................................................................................ 30 How FC target nodes connect to the network ............................................... 30 4 | Data ONTAP 8.0 7-Mode Block Access Management Guide for iSCSI and FC How FC nodes are identified ......................................................................... 30 Unified Ethernet network management ..................................................................... 32 Fibre Channel over Ethernet overview .......................................................... 33 What data center bridging is .......................................................................... 33 Displaying DCB settings ............................................................................... 34 Storage provisioning ................................................................................... 37 Storage units for managing disk space ...................................................................... 37 What autodelete is ..................................................................................................... 38 What space reservation is .......................................................................................... 39 What fractional reserve is .......................................................................................... 39 Methods of provisioning storage in a SAN environment .......................................... 41 Guidelines for provisioning storage in a SAN environment ......................... 42 Estimating how large a volume needs to be when using autodelete ............. 43 Estimating how large a volume needs to be when using fractional reserve ...................................................................................................... 44 Configuring volumes and LUNs when using autodelete .............................. 47 Retaining thinly provisioned LUNs online ................................................... 51 About LUNs, igroups, and LUN maps ...................................................................... 52 Information required to create a LUN ........................................................... 53 What igroups are ........................................................................................... 56 Required information for creating igroups .................................................... 57 What LUN mapping is .................................................................................. 59 Required information for mapping a LUN to an igroup ............................... 59 Guidelines for mapping LUNs to igroups ..................................................... 60 Mapping read-only LUNs to hosts at SnapMirror destinations .................... 60 How to make LUNs available on specific FC target ports ............................ 61 Guidelines for LUN layout and space allocation .......................................... 61 LUN alignment in virtual environments ....................................................... 62 Ways to create LUNs, create igroups, and map LUNs to igroups ............................ 62 Creating LUNs, creating igroups, and mapping LUNs with the LUN setup program .......................................................................................... 62 Creating LUNs, creating igroups, and mapping LUNs using individual commands ................................................................................................ 63 Creating LUNs on vFiler units for MultiStore .......................................................... 64 Displaying vFiler LUNs ................................................................................ 65 LUN management ....................................................................................... 67 Table of Contents | 5 Displaying command-line Help for LUNs ................................................................ 67 Controlling LUN availability .................................................................................... 68 Bringing LUNs online ................................................................................... 68 Taking LUNs offline ..................................................................................... 69 Unmapping LUNs from igroups ............................................................................... 69 Moving LUNs ........................................................................................................... 70 Modifying LUN descriptions .................................................................................... 70 Enabling and disabling space reservations for LUNs ............................................... 71 Removing LUNs ....................................................................................................... 71 Accessing LUNs with NAS protocols ....................................................................... 72 Checking LUN, igroup, and FC settings ................................................................... 72 Displaying LUN serial numbers ................................................................................ 74 Displaying LUN statistics ......................................................................................... 74 Displaying LUN mapping information ..................................................................... 75 Displaying detailed LUN information ....................................................................... 76 Displaying hidden staging area LUNs ...................................................................... 76 igroup management .................................................................................... 79 Creating igroups ........................................................................................................ 79 Creating FCP igroups on UNIX hosts using the sanlun command ..........................