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VMware ESXi, you can use VMware vCenter or the RemoteCLI package to see the number of paths to a

given LUN. If you are using an ESX version with a service console, type:

# esxcfg-mpath -l

Figure 13. VMware ESX Server 3.0 path information for Fibre Channel devices

Figure 13 shows the seven devices attached to the CLARiiON storage system. The vmhba0:x:x devices are

Fibre Channel devices. All Fibre Channel devices have paths to both SP A and SP B. The active mode for

each path shows the path the ESX server uses to access the disk. The preferred mode, although it is

displayed, is not honored (it is ignored) since the policy is set to Most Recently Used (MRU). Device

vmhba2:0:0 is the internal boot device and has a single path.

Figure 14 shows the three devices attached to the CLARiiON storage system. The vmhba40:0:x devices

are iSCSI devices. All iSCSI devices have paths going to both SP A and SP B. If using VMware NIC

teaming, the NICs must be on the same subnet and use the same IP address for failover to work between

multiple iSCSI NICs (uplink adapters). As a best practice, create dedicated virtual switches for iSCSI

traffic.

With ESX 3.5/ESXi, VMware supports the configuration of two virtual switches on separate subnets that

go to different network switches if you use the iSCSI software initiator that is built in to VMware ESX

Server.

EMC CLARiiON Integration with

VMware ESX Server

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