Chapter 2. Initial configuration 47
Figure 2-11 shows a logical view of the Ethernet ports that are available for the configuration
of the service IP addresses. Only port one on each node can be configured with a service IP
address.
Figure 2-11 Service IP addresses that are available for configuration
2.6 Host configuration planning
Hosts must have two Fibre Channel connections for redundancy, but the IBM Storwize V5000
Gen2 also supports hosts with a single HBA port connection. However, if that HBA loses its
link to the SAN fabric or the fabric fails, the host loses access to its volumes.
Even with a single connection to the SAN, the host has multiple paths to the IBM Storwize
V5000 Gen2 volumes because that single connection must be zoned with at least one Fibre
Channel port per node. Therefore, multipath software is required. Multipath software is
required also for direct-attach SAS hosts. They can connect by using a single host port, but
for redundancy, two SAS connections per host are advised.
If two connections per host are used, multipath software is also required on the host. If an
iSCSI host is deployed, it also requires multipath software. All node canisters must be
configured and connected to the network so that any iSCSI hosts see at least two paths to
volumes. Multipath software is required to manage these paths.
Various operating systems are supported by the IBM Storwize V5000 Gen2. For more
information about various configurations supported, check the IBM System Storage
Interoperation Center (SSIC) website at the following address:
https://ibm.biz/BdxQhe
For more information, see Chapter 5, “Host configuration” on page 199.
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