HP EVA Array iSCSI Connectivity Option - Manual (Page 95)

6 Setting up the iSCSI Initiator for
multipathing
This chapter contains the following topics:
• Overview , page 95
• Configuring multipath with Windows iSCSI initiator , page 100
• Configuring multipath with the VMware iSCSI initiator , page 112
• Configuring multipath with the Solaris 10 iSCSI initiator , page 116
• Configuring multipath with the OpenVMS iSCSI initiator , page 123
• Device Mapper Multipath Enablement Kit for HP StorageWorks Disk Arrays , page 126
Overview
The mpx100/100b supports iSCSI multipath in a single or dual mpx100/100b configuration with
a single EVA storage system.
As with single-path mpx100/100b configurations, presenting EVA LUNs to an iSCSI Initiator is a two-step
process. First the EVA LUN must be presented to the mpx100/100b, and then it must be presented from
the mpx100/100b to the iSCSI Initiator.
Because the mpx100/100b is bridging SCSI commands and data from the host to storage with iSCSI and
Fibre Channel, it is important to understand what multipathing means from each technology's perspective.
NOTE:
The examples in this section show direct connect configurations between the EVA and the mpx100/100b.
Note, however, that iSCSI multipath is also supported in fabric connections.
IMPORTANT:
Windows XP Professional is not supported by Microsoft's Multipath I/O (MPIO).
Understanding Fibre Channel multipathing for the mpx100/100b
EVA storage array perspective
The mpx100/100b has two FC ports, each having a unique WWPN. When connected to the EVA
storage system, these WWPNs behave like any other WWPN accessing the array. When the iSCSI host
entry is created in HP Command View, all FC port WWPNs are included in the iSCSI host properties.
The mpx100/100b FC ports do not necessarily have to be connected to the EVA storage controller to be
added to the iSCSI host entry. Upon iSCSI device discovery, HP Command View polls the mpx100/100b
for both FC port WWPNs and adds them to the iSCSI host entry FC port list.
If a single mpx100/100b is discovered as an iSCSI controller (see
Figure 42 ), both of its FC ports will
be included in the single HP Command View iSCSI host entry. If two mpx100's/100b's are discovered
(see Figure 43 ), the single HP Command View EVA iSCSI host entry contains four FC ports—two from
each mpx100/100b.
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