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book.book Page 2 Sunday, September 11, 2011 10:24 PM Notes, Cautions, and Warnings NOTE: A NOTE indicates important information that helps you make better use of your computer. CAUTION: A CAUTION indicates potential damage to hardware or loss of data if instructions are not followed. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. ____________________ Information in this publication is subject to change without notice. © 2011 Dell Inc. All rights reserved.
book.book Page 3 Sunday, September 11, 2011 10:24 PM Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . System Requirements . . . . . . . . . . . . . . . . . . . 2 Hardware Installation 7 . . . . . . . . . . . . . . 8 . . . . . . . . . . . . . . . Planning the Storage Configuration . 11 . . . . . . . . . . 11 . . . . . . . . . . . . . 12 . . . . . . . . . . . . . . . 12 Connecting the Storage Array . Cabling the Storage Array . 7 . . . . . . . . .
book.book Page 4 Sunday, September 11, 2011 10:24 PM 3 Installing PowerVault MD Storage Software . . . . . . . . . . . . . . . . . . . . . . . . . 27 . . . . . . 28 . . . . . . . . . . . . . . . . 30 . . . . . . . . . . . . . . . . . . 30 Graphical Installation (Recommended) . Console Installation . Silent Installation Upgrading PowerVault MD Storage Software 4 Post Installation Tasks . Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
book.book Page 5 Sunday, September 11, 2011 10:24 PM Uninstalling PowerVault MD Storage Software From Linux . . . . . . . . . . . . . . . . . . . . . . . . 54 . . . . . 55 . . . . . . . . . . . 56 A Appendix—Manual Configuration of iSCSI . . . . . . . . . . . . . . . . . . . . . Step 1: Discover the Storage Array (Out-of-band Management Only) . Default Management Port Settings . . . . . . . . 56 Automatic Storage Array Discovery . . . . . . . . 57 . . . . . . . . . 57 . . . . . . . . . . .
book.book Page 6 Sunday, September 11, 2011 10:24 PM Step 7: Connect to the Target Storage Array From he Host Server . . . . . . . . . . . . . . . . . . . . . . 70 Step 8: (Optional) Set Up In-Band Management. . . . . 74 B Appendix—Using Internet Storage Naming Service . . . . . . . . . . . . . . . . . . . . 75 C Appendix—Load Balancing . Load Balance Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . Round Robin With Subset . . . . . . . . . . . . . . 77 . . . . . . . . . .
book.book Page 7 Sunday, September 11, 2011 10:24 PM 1 Introduction This guide provides information about deploying Dell PowerVault MD MD3200i and Dell PowerVault MD3220i storage arrays. The deployment process includes: • Hardware installation • Modular Disk Storage Manager (MDSM) software installation • Initial system configuration Other information provided include system requirements, storage array organization, and utilities. NOTE: For more information on product documentation see, support.
book.book Page 8 Sunday, September 11, 2011 10:24 PM • Display resolution of 1024x768 with 16 million colors (1280x1024 32-bit recommended) • Microsoft Windows, Red Hat Enterprise Linux, and SUSE Linux Enterprise Server. NOTE: Operating system installations can be either native or hypervisor guest configurations. NOTE: Supported hypervisors include Microsoft Hyper-V, Citrix XenServer, and VMware. For information about the supported versions, see the Support Matrix at support.dell.com.
book.book Page 9 Sunday, September 11, 2011 10:24 PM Unconfigured capacity comprises of physical disks not already assigned to a disk group. When a virtual disk is created using unconfigured capacity, a disk group is automatically created. If the only virtual disk in a disk group is deleted, the disk group is also deleted. Free capacity is space in a disk group that is not assigned to any virtual disk. Data is written to the physical disks in the storage array using RAID technology.
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book.book Page 11 Sunday, September 11, 2011 10:24 PM 2 Hardware Installation Before using this guide, ensure that you review the instructions in the: • Getting Started Guide—The Getting Started Guide that shipped with the storage array provides information to configure the initial setup of the system. • Planning section of the Owner’s Manual—The planing section provides information about important concepts you must know before setting up your storage solution. See the Owner’s Manual at support.dell.
book.book Page 12 Sunday, September 11, 2011 10:24 PM Connecting the Storage Array The storage array is connected to a host using two hot-swappable RAID controller modules. The RAID controller modules are identified as RAID controller module 0 and RAID controller module 1. Each RAID controller module has four iSCSI In port connectors that provide Ethernet connections to the host server or switches. Each RAID controller module also contains an Ethernet management port and a SAS Out port.
book.book Page 13 Sunday, September 11, 2011 10:24 PM Direct-Attached Configurations You can connect the Ethernet ports of the host servers directly to the storage array RAID controller module iSCSI ports. Single Path Data Configurations With a single path configuration, a group of heterogeneous hosts can be connected to the storage array through a single physical Ethernet port. Since there is only one port, there is no redundancy, although each iSCSI portal supports multiple connections.
book.book Page 14 Sunday, September 11, 2011 10:24 PM Figure 2-1 shows a non-redundant cabling configuration to the RAID controller modules using a single path data configuration. Figure 2-1.
book.book Page 15 Sunday, September 11, 2011 10:24 PM Figure 2-2 shows two hosts connected to a single controller array. Figure 2-2.
book.book Page 16 Sunday, September 11, 2011 10:24 PM Figure 2-3 shows eight stand-alone hosts supported in a dual controller array configuration with a single data path. Figure 2-3.
book.book Page 17 Sunday, September 11, 2011 10:24 PM Dual-Path Data Configuration In Figure 2-4, up to four servers are directly attached to the RAID controller modules. If the host server has a second Ethernet connection to the array, it can be attached to the iSCSI ports on the array's second controller. This configuration provides improved availability by allowing two separate physical paths for each host, which ensures full redundancy if one of the paths fail.
book.book Page 18 Sunday, September 11, 2011 10:24 PM Figure 2-4.
book.book Page 19 Sunday, September 11, 2011 10:24 PM Figure 2-5.
book.book Page 20 Sunday, September 11, 2011 10:24 PM Network-Attached Configurations You can also cable the host servers to the RAID controller module iSCSI ports through industry-standard 1GB Ethernet switches. An iSCSI configuration that uses Ethernet switches is frequently referred to as an IP SAN. By using an IP SAN, the PowerVault MD3200i series storage array can support up to 64 hosts simultaneously.
book.book Page 21 Sunday, September 11, 2011 10:24 PM Figure 2-6.
book.book Page 22 Sunday, September 11, 2011 10:24 PM Figure 2-7.
book.book Page 23 Sunday, September 11, 2011 10:24 PM Cabling PowerVault MD1200 Series Expansion Enclosures You can expand the capacity of your PowerVault MD3200i series storage array by adding PowerVault MD1200 series expansion enclosures. You can expand the physical disk pool to a maximum of 120 (or 192, if enabled using Premium Feature activation) physical disks using a maximum of seven expansion enclosures.
book.book Page 24 Sunday, September 11, 2011 10:24 PM a Install the software and driver package included on the PowerVault MD series resource media. For information about installing the software, see "Installing PowerVault MD Storage Software" on page 25. b Update the storage array RAID controller module firmware and NVSRAM to the latest versions available at support.dell.com, using PowerVault MDSM. c Click Tools Upgrade RAID Controller Module Firmware in the Enterprise Management Window (EMW).
book.book Page 25 Sunday, September 11, 2011 10:24 PM Expanding With New PowerVault MD1200 Series Expansion Enclosures Perform the following steps to attach new PowerVault MD1200 series expansion enclosures to a PowerVault MD3200i series storage array: 1 Before adding the expansion enclosure(s), ensure that the storage array software is installed and up to date. For more information, see the Support Matrix at support.dell.com/manuals.
book.book Page 26 Sunday, September 11, 2011 10:24 PM c Turn off any expansion enclosure(s) in the affected system. 3 Cable the expansion enclosure(s) to the storage array. 4 Turn on attached units: a Turn on the expansion enclosure(s). Wait for the enclosure status LED to turn blue. b Turn on the storage array and wait for the status LED to indicate that the unit is ready: c • If the status LEDs are solid amber, the storage array is still coming online.
book.book Page 27 Sunday, September 11, 2011 10:24 PM 3 Installing PowerVault MD Storage Software The Dell PowerVault MD series resource media contains software and drivers for both Linux and Microsoft Windows operating systems. The root of the media contains a readme.txt file covering changes to the software, updates, fixes, patches, and other important data applicable to both Linux and Windows operating systems. The readme.
book.book Page 28 Sunday, September 11, 2011 10:24 PM NOTE: If Dynamic Host Configuration Protocol (DHCP) is not used, initial configuration of the management station must be performed on the same physical subnet as the storage array. Additionally, during initial configuration, at least one network adapter must be configured on the same IP subnet as the storage array’s default management port (192.168.128.101 or 192.168.128.102).
book.book Page 29 Sunday, September 11, 2011 10:24 PM 2 Select Install MD Storage Software. 3 Read and accept the license agreement. 4 Select one of the following installation options from the Install Set dropdown menu: • Full (recommended)—Installs the PowerVault MD Storage Manager (client)software, host-based storage agent, multipath driver, and hardware providers. • Host Only—Installs the host-based storage agent and multipath drivers.
book.book Page 30 Sunday, September 11, 2011 10:24 PM NOTE: The MD Storage Manager installer automatically installs the required drivers, firmware, and operating system patches/hotfixes to operate your storage array. These drivers and firmware are also available at support.dell.com. In addition, see the Support Matrix at support.dell.com/manuals for any additional settings and/or software required for your specific storage array.
book.book Page 31 Sunday, September 11, 2011 10:24 PM 2 Modify the custom_silent.properties file to reflect the features, models and installation options to be used. Then, save the file. 3 Once the custom_silent.properties file is revised, run the following command to begin the installation: ./mdss_install.bin –f /custom_silent.
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book.book Page 33 Sunday, September 11, 2011 10:24 PM Post Installation Tasks 4 Before using the storage array for the first time, complete a number of initial configuration tasks in the order shown. These tasks are performed using the MD Storage Manager (MDSM) software. NOTE: If Dynamic Host Configuration Protocol (DHCP) is not used, initial configuration using the management station must be performed on the same physical subnet as the storage array.
book.book Page 34 Sunday, September 11, 2011 10:24 PM Table 4-1. Standard Terminology Used in iSCSI Configuration Term Definition iSCSI initiator The iSCSI-specific software installed on the host server that controls communications between the host server and the storage array. iSCSI host port The iSCSI port (two per controller) on the storage array.
book.book Page 35 Sunday, September 11, 2011 10:24 PM IPv4 Settings host server A 192.168.133.101 (In 3 default) Mutual CHAP Secret 192.168.128.101 (management network port) 192.168.132.101 (In 2 default) 192.168.131.101 (In 1 default) 192.168.130.101 (In 0 default) B PowerVault MD32xxi Target CHAP Secret 192.168.130.102 (In 0 default) 192.168.131.102 (In 1 default) 192.168.132.102 (In 2 default) 192.168.133.102 (In 3 default) 192.168.128.
book.book Page 36 Sunday, September 11, 2011 10:24 PM IPv6 Settings A host server B PowerVault MD32xxi Mutual CHAP Target CHAP If you need additional space for more than one host server, use an additional sheet. A B Link local IP address ___ . ___ . ___ . ___ Host iSCSI port 2 Link local IP address ___ . ___ . ___ . ___ Routable IP address ___ . ___ . ___ . ___ Routable IP address ___ . ___ . ___ . ___ Subnet prefix ___ . ___ . ___ . ___ Subnet prefix ___ . ___ . ___ .
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book.book Page 38 Sunday, September 11, 2011 10:24 PM Configuring iSCSI on Your Storage Array The following sections contain step-by-step instructions for configuring iSCSI on your storage array. However, before beginning, it is important to understand where each of these steps occur in relation to your host server/storage array environment. Table 4-2 below shows each specific iSCSI configuration step and where it occurs. Table 4-2. Host Server Vs.
book.book Page 39 Sunday, September 11, 2011 10:24 PM Automatic Configuration Using the Modular Disk Configuration Utility NOTE: If PowerVault MDCU is not installed, it can be installed from the PowerVault MD series resource media. PowerVault MDCU provides a consolidated approach for configuring the iSCSI network of host servers and iSCSI-based storage arrays using a wizard-driven interface.
book.book Page 40 Sunday, September 11, 2011 10:24 PM 4 Configure the IP protocols and addresses for the management ports. 5 Configure the IP protocols and addresses for the iSCSI ports. 6 Specify the CHAP authentication method. 7 Apply the settings after reviewing a summary. 8 Repeat the process starting from step 2 to configure additional arrays.
book.book Page 41 Sunday, September 11, 2011 10:24 PM Keep the following guidelines in mind for the storage array and host configuration: • For optimal performance, ensure your network configuration is valid by consulting the storage array's support matrix. • If your host has multiple network interfaces, it is recommended that each network interface uses a separate subnet.
book.book Page 42 Sunday, September 11, 2011 10:24 PM • Automatic Discovery—Automatic discovery queries the local sub-network for all iSCSI-based storage arrays and may take several minutes to complete. • Manual Discovery—Manual discovery allows you to locate iSCSI-based storage arrays that are outside of the local sub-network.
book.book Page 43 Sunday, September 11, 2011 10:24 PM If you have not selected Specify Configuration Manually for any of the two protocols, then you can skip step 8. 8 If you have selected Specify Configuration Manually for any of the two protocols in the last step, a series of screens showing the backend view image of the storage array controllers is displayed. Each image contains IP addresses of management ports of the controllers. Also each image has one management port highlighted in red.
book.book Page 44 Sunday, September 11, 2011 10:24 PM 15 If you selected Yes in the last step, then the Select Storage Array screen is displayed. Select the storage array that you want to configure for connectivity to the local host. NOTE: The storage arrays configured by the utility are marked as Configuration Complete against their names in the list. This helps you to identify the arrays that are ready to be configured for host access.
book.book Page 45 Sunday, September 11, 2011 10:24 PM Configure the Host Connectivity Using PowerVault MDCU To configure the host connectivity for an iSCSI-based storage array(s) using PowerVault MDCU: 1 Launch the utility (if it is not launched automatically) from the server which needs to be configured for access to the iSCSI-based storage array(s). This server must have access to the array either using the array’s management ports or using the array’s iSCSI host ports.
book.book Page 46 Sunday, September 11, 2011 10:24 PM 7 In the Storage Array Login screen, in the Controller# column, select the iSCSI host port of the storage array that needs to be configured and its IP address(es). In the Host Address column, from drop-down menu list, select the host IP address that logs into the iSCSI host port of the storage array.
book.book Page 47 Sunday, September 11, 2011 10:24 PM For Microsoft Windows Server 2003, each list contains all available host IP addresses regardless of whether or not the address is able to communicate with the associated iSCSI port. You must select the appropriate host IP addresses for each iSCSI port. Automatic Selection NOTE: The contents in this section do not apply to Microsoft Windows Server 2003.
book.book Page 48 Sunday, September 11, 2011 10:24 PM Post Connection Establishment Steps After iSCSI connectivity is established between the host server(s) and the storage array, you can create virtual disks on the storage array using MDSM and these virtual disks can be utilized by the host server(s). For more information about storage planning and using MDSM, see the Owner’s Manual at support.dell.com/manuals.
book.book Page 49 Sunday, September 11, 2011 10:24 PM Guidelines for Configuring Your Network for iSCSI 5 This section provides general guidelines for setting up your network environment and IP addresses for use with the iSCSI ports on your host server and storage array. Your specific network environment may require different or additional steps than shown here, so make sure you consult with your system administrator before performing this setup.
book.book Page 50 Sunday, September 11, 2011 10:24 PM 3 On the General tab (for a local area connection) or the Networking tab (for all other connections), select Internet Protocol (TCP/IP), and then click Properties. 4 Select Use the following IP address and enter the IP address, subnet mask, and default gateway addresses. If you are using a DNS server: 1 In the Control Panel, select Network connections or Network and Sharing Center and then click Manage network connections.
book.book Page 51 Sunday, September 11, 2011 10:24 PM 7 To specify the location of the file that you want to import into the Lmhosts file, select Import LMHOSTS and then select the file in the Open dialog box. 8 Enable or disable NetBIOS over TCP/IP. If using Microsoft Windows Server 2008 Core Version, use the netsh interface command to configure the iSCSI ports on the host server.
book.book Page 52 Sunday, September 11, 2011 10:24 PM If you are using a static IP address (root users only): 1 Edit the /etc/sysconfig/network file as follows: NETWORKING=yes HOSTNAME=mymachine.mycompany.com GATEWAY=255.255.255.0 2 Edit the configuration file for the connection you want to configure, either /etc/sysconfig/network-scripts/ifcfg-ethX (for Red Hat Enterprise Linux) or /etc/sysconfig/network/ifcfg-eth-id-XX:XX:XX:XX:XX (for SUSE Enterprise Linux). BOOTPROTO=static BROADCAST=192.168.1.
book.book Page 53 Sunday, September 11, 2011 10:24 PM Uninstalling PowerVault MD Storage Software 6 Uninstalling Dell PowerVault MD Storage Software From Windows Use the Change/Remove Program feature to uninstall Dell PowerVault Modular Disk Storage Software from Microsoft Windows operating systems other than Microsoft Windows Server 2008: 1 From the Control Panel, double-click Add or Remove Programs. 2 Select Dell MD32xxi Storage Software from the list of programs. 3 Click Change/Remove.
book.book Page 54 Sunday, September 11, 2011 10:24 PM NOTE: By default, Dell PowerVault MD Storage Manager is installed in the \Program Files\Dell\MD Storage Software directory. If another directory was used during installation, navigate to that directory before beginning the uninstallation procedure. 2 From the installation directory, type the following command and press : Uninstall Dell MD Storage Software 3 From the Uninstall window, click Next and follow the instructions on the screen.
book.book Page 55 Sunday, September 11, 2011 10:24 PM A Appendix—Manual Configuration of iSCSI The following sections contain step-by-step instructions for configuring iSCSI on your storage array. However, before beginning, it is important to understand where each of these steps occur in relation to your host server or storage array environment. Table A-1 below shows each iSCSI configuration step and where it occurs. Table A-1. Host Server Vs.
book.book Page 56 Sunday, September 11, 2011 10:24 PM Step 1: Discover the Storage Array (Out-of-band Management Only) Default Management Port Settings By default, the storage array management ports are set to Dynamic Host Configuration Protocol (DHCP). If the controllers on your storage array are unable to get IP configuration from a DHCP server, it times out after 10 seconds and falls back to a default static IP address. The default IP configuration is: Controller 0: 255.255.255.0 IP: 192.168.128.
book.book Page 57 Sunday, September 11, 2011 10:24 PM Automatic Storage Array Discovery 1 Launch MD Storage Manager (MDSM). If this is the first storage array to be set up, the Add New Storage Array window is displayed. 2 Select Automatic and click OK. It may take several minutes for the discovery process to complete. Closing the discovery status window before the discovery process completes cancels the discovery process. After discovery is complete, a confirmation screen is displayed.
book.book Page 58 Sunday, September 11, 2011 10:24 PM NOTE: Before configuring the storage array, check the status icons on the Summary tab to ensure that the enclosures in the storage array are in an Optimal status. For more information on the status icons, see the Owner’s Manual at support.dell.com/manuals. Table A-2. Initial Setup Tasks Dialog Box Task Purpose Rename the storage array To provide a more meaningful name than the software-assigned label, Unnamed.
book.book Page 59 Sunday, September 11, 2011 10:24 PM Controller 1, Port 1: IP: 192.168.131.102 Subnet Mask: 255.255.255.0 Port: 3260 Controller 1, Port 2: IP: 192.168.132.102 Subnet Mask: 255.255.255.0 Port: 3260 Controller 1, Port 3: IP: 192.168.133.102 Subnet Mask: 255.255.255.0 Port: 3260 NOTE: No default gateway is set. To configure the iSCSI ports on the storage array: 1 From MDSM navigate to the Setup tab on the AMW.
book.book Page 60 Sunday, September 11, 2011 10:24 PM 3 To enable ICMP PING responses for all ports, select Enable ICMP PING responses. 4 Click OK when all iSCSI storage array port configurations are complete. 5 Test the connection by performing a ping command on each iSCSI storage array port. Step 3: Perform Target Discovery From the iSCSI Initiator This step identifies the iSCSI ports on the storage array to the host server.
book.book Page 61 Sunday, September 11, 2011 10:24 PM 6 Click OK to exit the Advanced menu and click OK again to exit the Add Target Portals screen. 7 To exit the Discovery tab, click OK. If you plan to configure CHAP authentication, do not perform discovery on more than one iSCSI port at this point. Go to "Step 4: Configure Host Access" on page 62. If you do not plan to configure CHAP authentication, repeat step 1 thorough step 6 for all iSCSI ports on the storage array.
book.book Page 62 Sunday, September 11, 2011 10:24 PM c Verify that the following time-out value is set to 30: node.session.timeo.replacement_timeout = 30 d Save and close the /etc/iscsi/iscsid.conf file.
book.book Page 63 Sunday, September 11, 2011 10:24 PM 5 Select the host type. 6 Select whether or not the host server will be part of a host server group that shares access to the same virtual disks as other host servers. Select Yes only if the host is part of a Microsoft cluster. 7 Click Next. 8 Specify if this host will be part of a host group. 9 Click Finish.
book.book Page 64 Sunday, September 11, 2011 10:24 PM CHAP is an optional feature and is not required to use iSCSI. However, if you do not configure CHAP authentication, any host server connected to the same IP network as the storage array can read from and write to the storage array. NOTE: When using CHAP authentication, you should configure it on both the storage array (using MDSM) and the host server (using the iSCSI initiator) before preparing virtual disks to receive data.
book.book Page 65 Sunday, September 11, 2011 10:24 PM Configuring Target CHAP Authentication on the Storage Array 1 From MDSM, click the iSCSI tab and then click Change Target Authentication. Select one of the CHAP settings described in Table A-4. Table A-4. CHAP Setting Option Description None This is the default selection. If None is the only selection, the storage array allows an iSCSI initiator to log on without supplying any type of CHAP authentication.
book.book Page 66 Sunday, September 11, 2011 10:24 PM Configuring Mutual CHAP Authentication on the Storage Array The initiator secret must be unique for each host server that connects to the storage array and must not be the same as the target CHAP secret. Change the initiator authentication settings in the Change Target Authentication window. Use these options to change the settings: • None—Select None if you permit no initiator authentication. If you select None, any initiator can access this target.
book.book Page 67 Sunday, September 11, 2011 10:24 PM 5 Under Target Portals, select the IP address of the iSCSI port on the storage array and click Remove. The iSCSI port you configured on the storage array during target discovery disappears. 6 Under Target Portals, click Add and re-enter the IP address or DNS name of the iSCSI port on the storage array (removed above). 7 Click Advanced and set the following values on the General tab: • Local Adapter—Should always be set to Microsoft iSCSI Initiator.
book.book Page 68 Sunday, September 11, 2011 10:24 PM 5 Remove the target portal that you configured on the storage array during target discovery: iscsicli RemoveTargetPortal 6 Add the target portal with CHAP defined: iscsicli QAddTargetPortal [CHAP_username] [CHAP_password] where, [CHAP_username] is the initiator name and [CHAP_password] is the target CHAP secret.
book.book Page 69 Sunday, September 11, 2011 10:24 PM 4 To set up discovery session CHAP authentication, first uncomment the following line: discovery.sendtargets.auth.authmethod = CHAP 5 Set a user name and password for a discovery session CHAP authentication of the initiator by the target(s) by editing the following lines: discovery.sendtargets.auth.username = discovery.sendtargets.auth.
book.book Page 70 Sunday, September 11, 2011 10:24 PM discovery.sendtargets.auth.username = iqn.198405.com.dell:powervault.123456 discovery.sendtargets.auth.password_in = test1234567890 If you are using SUSE Linux Enterprise Server SP3 using the GUI: 1 Click DesktopYaSTiSCSI Initiator. 2 Click Service Start, then select When Booting. 3 Select Discovered Targets, then select Discovery. 4 Enter the IP address of the port. 5 Click Next. 6 Select any target that is not logged in and click Log in.
book.book Page 71 Sunday, September 11, 2011 10:24 PM 3 Click Log On. 4 Select Automatically restore this connection when the system boots. 5 Select Enable multi-path. 6 Click Advanced and configure the following settings under the General tab: • Local Adapter—Must be set to Microsoft iSCSI Initiator. • Source IP—The source IP address of the host server you want to connect from. • Target Portal—Select the iSCSI port on the storage array controller that you want to connect to.
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book.book Page 73 Sunday, September 11, 2011 10:24 PM For example, your log on command might look like this: iscsicli PersistentLoginTarget iqn.198405.com.dell:powervault.6001372000ffe3332xx0000046 72edf2 3260 T 192.168.130.101 * * * 0x2 * * * * * * * * * 0 To view active sessions to the target, run the following command: iscsicli SessionList To support storage array controller failover, the host server must be connected to at least one iSCSI port on each controller.
book.book Page 74 Sunday, September 11, 2011 10:24 PM Step 8: (Optional) Set Up In-Band Management Out-of-band management (see "Step 1: Discover the Storage Array (Out-ofband Management Only)" on page 56) is the recommended method for managing the storage array. However, to optionally set up in-band management, use the steps shown below. The default iSCSI host port IPv4 addresses are shown below for reference: Controller 0, Port 0: IP: 192.168.130.101 Controller 0, Port 1: IP: 192.168.131.
book.book Page 75 Sunday, September 11, 2011 10:24 PM B Appendix—Using Internet Storage Naming Service Internet Storage Naming Service (iSNS) server, supported only on Microsoft Windows iSCSI environments, eliminates the need to manually configure each individual storage array with a specific list of initiators and target IP addresses. Instead, iSNS automatically discovers, manages, and configures all iSCSI devices in your environment.
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book.book Page 77 Sunday, September 11, 2011 10:24 PM Appendix—Load Balancing C Load Balance Policy Multi-path drivers select the I/O path to a virtual disk through a specific RAID controller module. When the multi-path driver receives a new I/O to process, the driver tries to find a path to the current RAID controller module that owns the virtual disk.
book.book Page 78 Sunday, September 11, 2011 10:24 PM Least Queue Depth With Subset The least queue depth with subset policy is also known as the least I/Os or least requests policy. This policy routes the next I/O request to a data path that has the least outstanding I/O requests queued. For this policy, an I/O request is simply a command in the queue. The type of command or the number of blocks that are associated with the command are not considered.
book.book Page 79 Sunday, September 11, 2011 10:24 PM To change the load balance policy using Windows Server 2008 disk management: 1 From the desktop of the host, right-click My Computer and click Manage to open the Computer Management dialog. 2 Click Disk Management to show the list of virtual disks attached to the host. 3 Right-click on the virtual disk for which you want to set the load balance policy, then click Properties.
book.book Page 80 Sunday, September 11, 2011 10:24 PM Figure C-1.
book.book Page 81 Sunday, September 11, 2011 10:24 PM Two sessions with one TCP connection are configured from the host to each controller (one session per port), for a total of four sessions. The multi-path failover driver balances I/O access across the sessions to the ports on the same controller. In a duplex configuration, with virtual disks on each controller, creating sessions using each of the iSCSI data ports of both controllers increases bandwidth and provides load balancing.
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book.book Page 83 Sunday, September 11, 2011 10:24 PM D Appendix—Stopping and Starting iSCSI Services in Linux To manually stop the iSCSI services in Linux, certain steps must be followed to maintain parallel processing between the storage array and the host server. 1 Stop all I/O. 2 Unmount all correlated file systems. Stop iSCSI service by running the following command: /etc/init.
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