Chapter 5. Host configuration 217
3. Click Storage Adapters, and scroll down to your FC HBAs (Figure 5-17). Document the
WWPNs of the installed adapters for later use.
Figure 5-17 Show WWPNs in VMware ESXi
VMware ESXi multipathing
The ESXi server has its own multipathing software. You do not need to install a multipathing
driver, either on the ESXi server or on the guest operating systems. The ESXi multipathing
policy supports several operating modes:
Round Robin
Fixed
Most Recently Used (MRU)
The IBM Storwize V5000 is an active/active storage device. The suggested multipathing
policy is
Round Robin. Round Robin performs static load balancing for I/O. If you do not want
the I/O balanced over all available paths, the
Fixed policy is supported also. This policy
setting can be selected for every volume.
Set this policy after you attach the Storwize V5000 LUNs to the ESXi host. For more
information, see Chapter 6, “Volume configuration” on page 287. If you use an older version
of VMware ESX (up to version 3.5),
Fixed is the suggested policy setting.
MRU selects the first working path, which is discovered at system start time. If this path
becomes unavailable, the ESXi/ESX host switches to an alternative path and continues to use
the new path while it is available. This policy is the default policy for LUNs that are presented
from an Active/Passive array. ESXi/ESX does not return to the previous path if, or when, it
returns. It remains on the working path until it, for any reason, fails.
Determining host WWPNs
The worldwide port names (WWPNs) of the FC HBA are required to correctly zone switches
and configure host attachment on the IBM Storwize V5000. On VMware ESXi, you can obtain
these WWPNs through the VMware vSphere Client.
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