HP XP20000/XP24000 HP StorageWorks MPX200 Multifunction Router User Guide (569 - Page 66
Multipathing, Table 9 Differences between Windows Server 2008 and Windows Server 2003
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g. Select Action > Rescan Disks. Verify that the newly assigned disk is listed; if not, you may need to reboot. h. Format and partition the disk to prepare it for use. Multipathing Microsoft MPIO includes support for redundant paths to send I/O from the initiator to the target. For Windows Server 2008, MPIO is a separate feature that must be installed separately. Microsoft iSCSI Software Initiator 2.x includes MPIO and must be selected for installation. Setting up redundant paths properly ensures high availability of the target disk. Ideally, the paths would use separate network interface cards (NICs) and a separate network infrastructure (cables, switches, and MPX200 blades). HP recommends using separate target ports. Microsoft MPIO allows the initiator to log in to multiple sessions to the same target and aggregate the duplicate devices into a single device exposed to Windows. Each session to the target can be established using different NICs, network infrastructure, and target ports. If one session fails, another session can continue processing I/O without interrupting the application. The iSCSI target must support multiple sessions to the same target. The Microsoft iSCSI MPIO DSM supports a set of load-balance policies that determine how I/O is allocated among sessions. With Microsoft MPIO, the load-balance policies apply to each LUN individually. The Microsoft iSCSI DSM 2.x assumes that all targets are active/active and can handle I/O on any path at any time. There is no mechanism in the iSCSI protocol to determine whether a target is active/active or active/passive; therefore, the MPX200 supports only multipath configurations with the EVA with active/active support. For more information, see the following: http://www.microsoft.com/WindowsServer2003/technologies/storage/mpio/default.mspx http://www.microsoft.com/WindowsServer2003/technologies/storage/mpio/faq.mspx http://download.microsoft.com/download/3/0/4/304083f1-11e7-44d9-92b9-2f3cdbf01048/ mpio.doc Table 9 details the differences between Windows Server 2008 and Windows Server 2003. Table 9 Differences between Windows Server 2008 and Windows Server 2003 iSCSI initiator MPIO Windows Server 2008 Included with operating system Must be installed separately Windows Server 2003 Must be installed separately Included with iSCSI initiator Table 10 lists the supported MPIO options for the MPX200. Table 10 MPIO options for the MPX200 Multipath support Windows Server 2008 HP MPIO Full Featured DSM for EVA (preferred) Supported Microsoft generic DSM Supported Windows Server 2003 Supported Supported 66 MPX200 iSCSI configuration rules and guidelines