Apple Xsan 1.4 User's Guide

Xsa nAdministrator’s Guide for Xsan 1.4

10 Contents 176 Starting a Volume Controller (fsm)177 Starting a Port Mapper Process (fsmpm)177 Defragmenting a File, Folder, or Volume (snfsdefrag)17

100 Chapter 3 Managing SAN StorageEnabling or Disabling Access Control ListsYou can use Xsan Admin to specify whether the Xsan file system uses acc

Chapter 3 Managing SAN Storage 101Choosing the Windows ID Mapping MethodUse the Windows ID Mapping setting to specify how Windows clients map user

102 Chapter 3 Managing SAN StorageDefragmenting a VolumeDefragmenting a file reassembles its pieces into the most efficient arrangement. You can us

Chapter 3 Managing SAN Storage 103Checking the Integrity of a VolumeIf SAN users are having trouble accessing files, you can use the cvfsck command

104 Chapter 3 Managing SAN StorageRepairing a VolumeIf the cvfsck utility reveals problems with a volume, you can use the same command to repair th

4 1054 Managing Clients and UsersThis chapter shows how to add, control, and remove client computers and their users.Xsan clients are computers that h

106 Chapter 4 Managing Clients and UsersAdding a ClientBefore a computer can access a SAN volume, you need to set up that computer as a SAN client.

Chapter 4 Managing Clients and Users 1074 Choose Client from the Role pop-up menu.You can choose Controller if you want the computer to be used as

108 Chapter 4 Managing Clients and UsersMounting a Volume on a ClientA user who is logged in to a client computer can’t mount a SAN volume. You or

Chapter 4 Managing Clients and Users 109Controlling Client and User AccessYou can control access to information on SAN volumes at several levels:Â

11 PrefaceAbout This BookUse this guide to learn how to set up and manage Xsan volumes on a storage area network.This guide shows how to use Xsan to c

110 Chapter 4 Managing Clients and UsersSetting Up Access Control ListsYou can use Mac OS X Server’s Workgroup Manager to control access to SAN vol

Chapter 4 Managing Clients and Users 1114 Click Mount Read Only.Removing a Client from a SANYou can remove a client computer from a SAN to prevent

112 Chapter 4 Managing Clients and UsersMapping Windows User and Group IDsYou can use the Windows ID Mapping setting for a volume to specify how Wi

Chapter 4 Managing Clients and Users 113To select the Windows ID mapping method:1 In Xsan Admin, select the volume in the SAN Components list, clic

114 Chapter 4 Managing Clients and UsersSetting User and Group QuotasYou can set quotas to manage the amount of storage available to a user or grou

Chapter 4 Managing Clients and Users 115If the user or group doesn’t appear in the drawer, open Directory Access and make sure the computer is usin

116 Chapter 4 Managing Clients and UsersHard QuotaThe hard quota is an absolute limit on the space a user or group can occupy. Users are prevented

Chapter 4 Managing Clients and Users 117Define SAN Users Consistently for Accurate QuotasTo be sure that Xsan user quota information is accurate, m

118 Chapter 4 Managing Clients and UsersTo view quota utilization:m Open Xsan Admin, select a volume in the SAN Components list, and click Quotas.T

Chapter 4 Managing Clients and Users 119Helping Clients Check Their Own QuotasSAN users who work at client computers but don’t have access to Xsan

12 Preface About This Book Chapter 7 lists solutions to common problems you might encounter.Appendix A contains information to help you combine Xsan

120 Chapter 4 Managing Clients and UsersCreating Local Home Folders for Network AccountsCreating SAN user accounts in a centralized directory simpl

5 1215 Managing Metadata ControllersThis chapter shows how to add, switch, monitor, and upgrade Xsan metadata controllers.Every SAN volume you set up

122 Chapter 5 Managing Metadata ControllersAdding a ControllerYou can add one or more standby controllers to a SAN so that volumes are still availa

Chapter 5 Managing Metadata Controllers 1232 In Xsan Admin, select the SAN in the SAN Components list and click Setup.3 Select the new controller i

124 Chapter 5 Managing Metadata ControllersSwitching to a Standby ControllerYou can force an active metadata controller to turn over control of a v

Chapter 5 Managing Metadata Controllers 125Finding Out Which Controller Is Hosting a VolumeControl of a particular volume can move from one control

126 Chapter 5 Managing Metadata ControllersTo view a volume’s controller:m Open Xsan Admin, select the volume in the SAN Components list, and click

Chapter 5 Managing Metadata Controllers 127Listing the Volumes Hosted by a ControllerYou can use Xsan Admin or the cvadmin command to find out whic

128 Chapter 5 Managing Metadata ControllersChanging a Controller’s IP AddressFollow these instructions if you need to change the IP address of an X

Chapter 5 Managing Metadata Controllers 1295 In Xsan Admin, change the role of the computer from Client back to Controller.If you want to switch co

Preface About This Book 13 Controller Client CompatibleXsan 1.4 Xsan 1.4 YesXsan 1.3 (Mac OS X v10.4) YesXsan 1.3 (Mac OS X v10.3) Yes, for LUNs &l

130 Chapter 5 Managing Metadata ControllersTo upgrade controller software without interruption:1 Switch all volumes to a standby controller.Go to t

6 1316 Monitoring SAN StatusThis chapter shows how to check the condition of a SAN and its components.This chapter shows you how to:Â Monitor a SAN se

132 Chapter 6 Monitoring SAN StatusLocking Xsan Admin Views for Secure MonitoringYou can use the Lock View command to allow SAN monitoring without

Chapter 6 Monitoring SAN Status 133Checking Overall SAN StatusXsan Admin can show you an overview of SAN status.To get a quick look at the status o

134 Chapter 6 Monitoring SAN StatusChecking Overall Volume StatusXsan Admin can show you an overview of the status of a particular volume.To get a

Chapter 6 Monitoring SAN Status 135Checking Free Space on a VolumeThere are several ways to see how much space is available on a SAN volume.To see

136 Chapter 6 Monitoring SAN StatusChecking Free Space on a Storage PoolIn addition to checking free space on a volume, you can check free space on

Chapter 6 Monitoring SAN Status 1373 Choose the type of data you want to graph from the Show pop-up menu and choose a computer from the On pop-up m

138 Chapter 6 Monitoring SAN StatusSetting Up Status NotificationsXsan can send an email or dial a pager to notify you or other administrators when

Chapter 6 Monitoring SAN Status 139Checking the Status of File System ProcessesYou can use Xsan Admin to see if Xsan file system processes are runn

14 Preface About This Book Upgrading from an Earlier Version of XsanFor more information about migrating your SAN storage to Xsan 1.4 from an earlie

140 Chapter 6 Monitoring SAN StatusFrom the Command LineTo see the log for a particular volume from the command line, look at the log file:/Library

Chapter 6 Monitoring SAN Status 141Checking for Fibre Channel Connection FailuresFibre Channel connection failures or errors are recorded in the sy

7 1437 Solving SAN ProblemsThis chapter provides solutions to common problems you might encounter while working with a SAN.Look here for solutions to

144 Chapter 7 Solving SAN ProblemsYou’re Unable to Install the Xsan SoftwareIf the installer says you can’t install the Xsan 1.4 software on a part

Chapter 7 Solving SAN Problems 145Xserve RAID LUNs Aren’t Accessible over Fibre Channel If you are using a Vixel 355 Fibre Channel switch, connect

146 Chapter 7 Solving SAN ProblemsSome LUNs Aren’t Listed in Xsan AdminIf you reuse an array that was previously labeled for use in another Xsan st

Chapter 7 Solving SAN Problems 147Some LUNs Are Listed Twice in Xsan AdminIf you are using mismatched versions of Xserve RAID firmware and the RAID

148 Chapter 7 Solving SAN ProblemsProblems Using Command-Line Tools If you get the response “command not found” when you try to use an Xsan comman

Chapter 7 Solving SAN Problems 149You’re Unable to Rename an Xsan Volume in the FinderXsan doesn’t allow a mounted Xsan volume to be renamed using

Preface About This Book 15 Notation ConventionsThe following conventions are used in this book wherever shell commands or other command-line items a

150 Chapter 7 Solving SAN ProblemsA Client is Unable to Use a Volume After a Fibre Channel InterruptionIf a client loses its Fibre Channel connecti

Chapter 7 Solving SAN Problems 151You’re Unable to Add a Storage PoolThere are some reserved names you can’t use to name a storage pool. If you typ

152 Chapter 7 Solving SAN ProblemsYou’re Unable to Add LUNs to a Storage PoolYou can’t add a new LUN to an existing storage pool unless the LUN is

Chapter 7 Solving SAN Problems 153To check the common LUN size for a storage pool:m In Xsan Admin, select the SAN or controller from the SAN Compon

154 Chapter 7 Solving SAN Problems4 If the capacity shown remains 2 TB or less, delete the current label (in the Label field), click OK, and click

Appendix 155AA Combining Xsan and StorNext Clients and ControllersThis appendix shows how to add Macintosh clients to an existing StorNext File System

156 Appendix A Combining Xsan and StorNext Clients and ControllersCompatible Software VersionsThe following table shows which versions of Xsan and

Appendix A Combining Xsan and StorNext Clients and Controllers 157Adding Macintosh Clients to a StorNext SANIf you already have a StorNext File Sys

158 Appendix A Combining Xsan and StorNext Clients and Controllers6 Delete or move the following files from /Library/Filesystems/Xsan/config/:autom

Appendix A Combining Xsan and StorNext Clients and Controllers 159Using Xsan Controllers with StorNext ClientsYou can use ADIC’s StorNext software

Appendix 161BB Using the Command LineThis appendix describes Xsan shell commands and configuration files you can use to work with a SAN from the comma

162 Appendix B Using the Command LineSending Commands to Remote ComputersTo use commands on a remote computer, first use SSH to log in to the other

Appendix B Using the Command Line 163Notation ConventionsThe following conventions are used throughout the command descriptions.Notation Indicatesf

164 Appendix B Using the Command LineThe CommandsXsan includes the following command-line tools:Viewing or Changing Volume and Storage Pool Setting

Appendix B Using the Command Line 165To execute commands from a file:$ sudo cvadmin [-H host] [-F volume] -f cmdfileTo execute a single command and

166 Appendix B Using the Command Linecvadmin Commandscvadmin command Descriptionactivate[volume|index] Choose the “active” volume that you want to

Appendix B Using the Command Line 167quotas [yes|no] Enable or disable quotas for the active (selected) volume. Use the command without any paramet

168 Appendix B Using the Command LineCopying Files or Folders (cvcp)You can use the cvcp command to perform high-speed file copies to or from an Xs

Appendix B Using the Command Line 169cvcp Command OptionsOption Description-A Turn off preallocation.-b buffers Set the number of I/O buffers to us

1 171 Overview of XsanThis chapter gives you an overview of Xsan and storage area networks.Read this chapter for an overview of Xsan and how you can u

170 Appendix B Using the Command LineExamplesCopy the file friday to /datasets/data1/july/:$ cvcp friday /datasets/data1/julyCopy the folder /data1

Appendix B Using the Command Line 171Checking or Repairing a Volume (cvfsck)You can use the cvfsck command to check or repair an Xsan volume.$ cvfs

172 Appendix B Using the Command LineLabeling, Listing, and Unlabeling LUNs (cvlabel)You can use the cvlabel command to initialize LUNs so they can

Appendix B Using the Command Line 173Creating a Folder with an Affinity (cvmkdir)You can use the cvmkdir command to create a folder (directory) wit

174 Appendix B Using the Command LineCreating and Preallocating a File (cvmkfile)You can use the cvmkfile command to allocate space for a file on a

Appendix B Using the Command Line 175ExampleAllocate 2 GB of space for the file “data1” on the storage pool “datasets”:$ cvmkfile -k datasets 2g da

176 Appendix B Using the Command LineApplying Volume Configuration Changes (cvupdatefs)You can use the cvupdatefs command to apply configuration fi

Appendix B Using the Command Line 177Starting a Port Mapper Process (fsmpm)You can use the fsmpm command to start a file system port mapper process

178 Appendix B Using the Command LineParameter Description-c Display an extent count but don’t defragment target.-D Display debugging messages.-d O

Appendix B Using the Command Line 179ExamplesCount the extents in the file “datafile”:$ snfsdefrag -c datafileList the extents:$ snfsdefrag -e data

18 Chapter 1 Overview of XsanXsan lets youcombine RAID arraysinto volumes clientsuse like local disks.File data movesover Fibre ChannelSan VolumeMa

180 Appendix B Using the Command Line2 Create the mount point where the file system will be mounted:$ mkdir mountpointwhere mountpoint is the direc

Appendix B Using the Command Line 181Viewing LogsThe system log to which Xsan writes information about SANs is in /var/log/system.logVolume logs ar

183 GlossaryGlossaryaffinity A relationship between a folder on an Xsan volume and one of the storage pools that provide storage for the volume. The

184 Glossary controller In an Xsan storage area network, short for metadata controller. See metadata controller. In RAID systems, controller refers

Glossary 185 label (verb) Used by some sources (such as ADIC) to refer to the process of preparing a logical disk for use with a file system. In Xsan

186 Glossary RAID array A group of physical disks organized and protected by a RAID scheme and presented by RAID hardware or software as a single lo

187IndexIndex“command not found” message 148“No manual entry for...” message 148Aaccesspermissions for folders 109read-only volumes 110unmounting

188 IndexDdefragmenting volumes 102directory services 37DNSusing with Xsan Admin 52Eemail notifications 138error -1425 149Ethernetguidelines 36e

Index 189limit per storage pool 31limit per volume 31maximum size 31name length limit 31overview 21preparing 51removing old label 146size adjus

Chapter 1 Overview of Xsan 19Xsan Storage Area NetworksA storage area network is a way of connecting computers to storage devices that gives users

190 Indexcvmkdir 173cvmkfile 174cvmkfs 175cvupdatefs 176fsm 176fsmpm 177installed location 161listed in table 164man pages 162problems using

Index 191repairing 104show clients using 140starting 73trouble mounting 144unmounting 110, 180XXsan Admin applicationand firewalls 52installing

K Apple Computer, Inc. © 2006 Apple Computer, Inc. All rights reserved. Under the copyright laws, this manual may not be copied, in whole or in pa

20 Chapter 1 Overview of XsanMetadatacontrollerClientsStandbycontrollerXserve RAIDstorageFibre Channel switchEthernet - TCP/IP (Public)Ethernet - T

Chapter 1 Overview of Xsan 21Shared SAN VolumesUsers and applications see shared SAN storage as local volumes. Xsan volumes are logical disks made

22 Chapter 1 Overview of XsanSAN ConnectionsXsan uses independent networks to connect storage devices, metadata controllers, and client computers:

Chapter 1 Overview of Xsan 23How Xsan Storage Is OrganizedUsers use an Xsan volume the same way they use a local disk. What they don’t see is that

24 Chapter 1 Overview of XsanThe following paragraphs describe these storage elements and how you organize them to create shared Xsan volumes.LUNsT

Chapter 1 Overview of Xsan 25Storage PoolsLUNs are combined to form storage pools. A storage pool in a small volume might consist of a single RAID

26 Chapter 1 Overview of XsanVolumesStorage pools are combined to create the volumes that users see. From the user’s perspective, the SAN volume lo

Chapter 1 Overview of Xsan 27The following screen image shows how LUNs, storage pools, and volumes appear as you organize them in Xsan Admin. This

28 Chapter 1 Overview of XsanFolders with AffinitiesTo control which storage pool is used to store specific files (for example, to provide differen

Chapter 1 Overview of Xsan 29These files are managed by the Xsan metadata controller, but are stored on SAN volumes, not on the controller itself.

3 Contents 11 About This Book12 What’s New in Xsan 1.4 12 Version Compatibility 14 Upgrading from an Earlier Version of Xsan 14 For More Informatio

30 Chapter 1 Overview of XsanSecurityAs the SAN administrator, you can control access to shared volumes in several ways.First, users cannot browse

Chapter 1 Overview of Xsan 31Xsan CapacitiesThe following table lists limits and capacities for Xsan volumes.Parameter MaximumNumber of computers o

2 332 Setting Up a Storage Area NetworkThis chapter lists requirements, suggests planning tips, and gives instructions for setting up an Xsan SAN.This

34 Chapter 2 Setting Up a Storage Area NetworkSupported ComputersYou can use Xsan 1.4 on computers that meet these minimum requirements:Systems Ma

Chapter 2 Setting Up a Storage Area Network 35Fibre Channel FabricUnlike file system metadata, which controllers and clients exchange over Ethernet

36 Chapter 2 Setting Up a Storage Area NetworkFabric ConfigurationYou must connect the computers, storage devices, and switches in your Fibre Chann

Chapter 2 Setting Up a Storage Area Network 37IP Addresses and Domain NamesAssign fixed, non-routed IP addresses to all clients, controllers, and s

38 Chapter 2 Setting Up a Storage Area NetworkIf you don’t have access to a directory service, you can use the directory services in Mac OS X Serve

Chapter 2 Setting Up a Storage Area Network 39Planning Your SANIt’s easy to add storage to an existing Xsan SAN, but reorganizing a SAN after you s

4 Contents 28 Metadata and Journal Data 29 Striping at a Higher Level 30 Security 30 Expanding Storage 31 Xsan Capacities 33 Chapter 2: Setting Up

40 Chapter 2 Setting Up a Storage Area NetworkPreliminary Planning Questions How much storage do you need? How do you want to present available s

Chapter 2 Setting Up a Storage Area Network 41Planning Considerations and GuidelinesThe following paragraphs might help you make some of your SAN d

42 Chapter 2 Setting Up a Storage Area NetworkPerformance ConsiderationsIf your SAN supports an application (such as high resolution video capture

Chapter 2 Setting Up a Storage Area Network 43Â Use a router to isolate the Ethernet network used by the SAN from a company intranet or the Interne

44 Chapter 2 Setting Up a Storage Area NetworkSecurity ConsiderationsIf your SAN will support projects that need to be completely secure and isolat

Chapter 2 Setting Up a Storage Area Network 45Xserve RAID supports all popular RAID levels. Each RAID scheme offers a different balance of performa

46 Chapter 2 Setting Up a Storage Area NetworkFor a more typical balance of security and shared access, a flexible compromise is to create a single

Chapter 2 Setting Up a Storage Area Network 47Creating storage pools from LUNs that are hosted on different drive modules and different RAID contro

48 Chapter 2 Setting Up a Storage Area NetworkIf you have a small number of clients or if performance is not critical you can use a single computer

Chapter 2 Setting Up a Storage Area Network 49Combining Clients and ControllersThe same computer can function as both a metadata controller and a c

Contents 5 53 SAN and Volume Setup Summary 54 Setting Up an Xsan Volume on a Storage Area Network 74 Renaming a SAN 75 Removing a SAN 75 Setting Up

50 Chapter 2 Setting Up a Storage Area NetworkEstimating Metadata and Journal Data Storage NeedsTo estimate the amount of space required for Xsan v

Chapter 2 Setting Up a Storage Area Network 51Preparing LUNsXserve RAID systems usually come preconfigured with two RAID 5 arrays, one on each side

52 Chapter 2 Setting Up a Storage Area NetworkInstalling Just the Xsan Admin ApplicationXsan Admin is included when you install the Xsan software o

Chapter 2 Setting Up a Storage Area Network 53Using the Command LineIf necessary, you can perform many Xsan setup and management tasks from a shell

54 Chapter 2 Setting Up a Storage Area NetworkSetting Up an Xsan Volume on a Storage Area NetworkStep 1: Set Up the Fibre Channel Networkm Connect

Chapter 2 Setting Up a Storage Area Network 55Step 4: Set Up LUNsm New Xserve RAID systems are usually preconfigured as two RAID 5 arrays that are

56 Chapter 2 Setting Up a Storage Area NetworkTo install Xsan on a computer that has no keyboard or monitor:1 Log in to a computer that does have a

Chapter 2 Setting Up a Storage Area Network 57Step 6: Open Xsan Admin and Log In to the SAN1 Open Xsan Admin on any computer connected to the SAN.

58 Chapter 2 Setting Up a Storage Area Network4 In the Computers pane, type a name for the SAN and click Save.The SAN name you type appears in the

Chapter 2 Setting Up a Storage Area Network 591 In the Computers pane, select a computer in the list.If the computer you’re looking for is not list

6 Contents 99 Setting the Volume Allocation Strategy 100 Enabling or Disabling Access Control Lists 101 Choosing the Windows ID Mapping Method 101

60 Chapter 2 Setting Up a Storage Area NetworkYou can find the serial number for a single copy of Xsan on the Xsan installation disc sleeve. If you

Chapter 2 Setting Up a Storage Area Network 61Step 8: Label and Initialize LUNsNext, label and initialize the available LUNs for use with the Xsan

62 Chapter 2 Setting Up a Storage Area NetworkIf existing LUNs are not listed, particularly if they are LUNs you have used before as part of an old

Chapter 2 Setting Up a Storage Area Network 63Step 9: Create VolumesNext, you’ll create the volumes your users will see.1 In Xsan Admin, click Sto

64 Chapter 2 Setting Up a Storage Area Network4 Don’t adjust the block allocation size unless you have specific performance tuning needs.For more i

Chapter 2 Setting Up a Storage Area Network 65Step 10: Add Storage Pools to the Volumes1 Select a volume in the list and click the New Storage Poo

66 Chapter 2 Setting Up a Storage Area Network Use for: Choose the type of data to store in the storage pool. Journal data is used by the control

Chapter 2 Setting Up a Storage Area Network 67Step 11: Add LUNs to Storage PoolsThe final step in preparing storage for the SAN is assigning LUNs

68 Chapter 2 Setting Up a Storage Area NetworkStep 12: (Optional) Set Up SAN Status NotificationsXsan can notify you by email or pager when the co

Chapter 2 Setting Up a Storage Area Network 695 If the notification is to be sent to a computer that is not on the local SAN subnet, click SMTP Inf

Contents 7 12 0 Creating Local Home Folders for Network Accounts 121 Chapter 5: Managing Metadata Controllers12 2 Adding a Controller 12 3 Setting

70 Chapter 2 Setting Up a Storage Area Network1 In Xsan Admin, select a volume in the SAN Components list and click Start Volume.2 With the volume

Chapter 2 Setting Up a Storage Area Network 71Step 14: (Optional) Set User and Group QuotasYou can set up quotas to control how much space on each

72 Chapter 2 Setting Up a Storage Area Network3 Click the Add (+) button, and then drag a user or group from the drawer to the quotas list.If you d

Chapter 2 Setting Up a Storage Area Network 73Step 15: Start the Volumes and Mount Them on ClientsTo make a volume available to a user or applicat

74 Chapter 2 Setting Up a Storage Area Network4 To allow the client to modify files on the volume, click Mount Read & Write.To prevent the clie

Chapter 2 Setting Up a Storage Area Network 75Removing a SANFollow these steps to take a SAN out of service and remove it from Xsan Admin.To remove

3 773 Managing SAN StorageThis chapter shows how to expand, modify, check, and repair SAN storage.This chapter shows how to:Â Add storage to a SAN (pa

78 Chapter 3 Managing SAN Storage Set the block allocation size (page 97) Set the storage allocation strategy (page 99) Enable or disable access

Chapter 3 Managing SAN Storage 79The third option creates a new volume that must be explicitly mounted on client computers. Clients must then choos

8 Contents 140 Checking Volume Clients 141 Checking for Fibre Channel Connection Failures 141 Checking the State of Xserve RAID Systems 143 Chapter

80 Chapter 3 Managing SAN StorageAdding LUNs to a Storage PoolYou can increase the capacity of a SAN volume by adding LUNs (RAID arrays or array sl

Chapter 3 Managing SAN Storage 81Important: If you forget to unmount the volume (in step 3) before you stop it, be sure to click Disconnect in the

82 Chapter 3 Managing SAN StorageFrom the Command LineYou can also add LUNs to a storage pool by modifying the associated volume configuration file

Chapter 3 Managing SAN Storage 83 Use for: Choose the types of data that can be stored on the storage pool. Stripe Breadth: Specify how much da

84 Chapter 3 Managing SAN StorageAdding a Volume to a SANA single Xsan SAN can provide multiple shared volumes.1 Open Xsan Admin and select the SAN

Chapter 3 Managing SAN Storage 855 Select the new volume and click the Add Storage Pool button. In the dialog that appears, provide the following i

86 Chapter 3 Managing SAN StorageAssigning a Storage Pool Affinity to a FolderYou can set up an affinity between a folder and a storage pool so tha

Chapter 3 Managing SAN Storage 875 Choose the storage pool (where the folder’s contents will be stored) from the Storage Pool Affinity pop-up menu

88 Chapter 3 Managing SAN Storage3 In Terminal, type$ sudo cvmkdir -k affinity pathwhere affinity is the affinity name of a storage pool in the vol

Chapter 3 Managing SAN Storage 89Removing an AffinityThe way you remove an affinity depends on whether the affected folder is at the top level of t

Contents 9 152 You’re Unable to Add LUNs to a Storage Pool 153 The Capacity of a Larger LUN is Listed as 2 Terabytes 155 Appendix A: Combining Xsa

90 Chapter 3 Managing SAN StorageChanging Storage Pool SettingsThe best way to set up a SAN is to plan its organization carefully before you set it

Chapter 3 Managing SAN Storage 91Renaming a Storage PoolYou can rename a storage pool, but doing so erases all data on the storage pool and the vol

92 Chapter 3 Managing SAN StorageChoosing the Types of Files Stored on a Storage PoolYou can limit the files that are stored on a particular storag

Chapter 3 Managing SAN Storage 93To set the stripe breadth:1 In Xsan Admin, select the SAN that the storage pool belongs to, click Setup, and click

94 Chapter 3 Managing SAN StorageFor Xserve RAID systems, which have an optimal transfer size of 1 MB, this becomes:stripe breadth = 1048576 / bloc

Chapter 3 Managing SAN Storage 95From the Command LineYou can also set the multipath method using the cvadmin multipath command in Terminal. For mo

96 Chapter 3 Managing SAN StorageTo view or change volume settings:m Select the SAN in the SAN Components list, click Setup, and click Storage. The

Chapter 3 Managing SAN Storage 975 Mount the volume on clients.Select the volume and click Clients. Select clients and click Mount.Setting the Bloc

98 Chapter 3 Managing SAN StorageChoosing Block Allocation Size for a VolumeXsan uses the volume block allocation size and storage pool stripe brea

Chapter 3 Managing SAN Storage 99Setting the Volume Allocation StrategyYou can set the allocation strategy for a volume to determine the order in w