HP StorageWorks Scalable File Share System Installation and Upgrade Guide Version 2.2

Preparing for the installation2–10
2.4.2 Assigning IP addresses on Gigabit Ethernet networks
NOTE: Use the worksheet in Table B-2 in Appendix B to record the information you gather in this section.
You can have up to three Gigabit Ethernet networks in an HP SFS system. Only two of these networks can
be used as interconnects, and the administration server and the MDS server must use one of the Gigabit
Ethernet networks to connect to the site network (for system administration purposes). As described in
Section 2.4.1, you can dedicate one Gigabit Ethernet network for the site network connection (that is, the
network will not be used for connecting to client systems).
When you are planning the IP addresses that you will assign to your Gigabit Ethernet networks, note the
following points:
• With the exception of bonded Gigabit Ethernet interfaces, each Gigabit Ethernet interface must be on
a separate logical network. (In some cases, the networks may also be physically separate, but this is
not a requirement.) In the case of bonded Gigabit Ethernet interfaces, the bonded interfaces must be
on the one network, but all other interfaces must be on separate logical networks.
Networks are considered to be logically separate if they cannot communicate as a result of the subnet
mask applied to them. For example, the 10.128.0.0/255.255.255.0 network is logically separate
from the 10.128.8.0/255.255.255.0 network, but not from the10.128.8.0/255.255.0.0 network.
When you are configuring a dual Gigabit Ethernet interconnect, you must be careful to ensure that
the network addresses and netmasks provided for each interconnect network preclude the possibility
of the networks communicating with each other.
• If a separate site network is used, it must not be configured on all servers—it must only be configured
on the administration and MDS servers.
• You must assign an IP address to each Gigabit Ethernet network NIC on the servers where a network
is to be configured. The IP addresses within each network must share a common netmask.
When you configure the Gigabit Ethernet networks during installation, you specify the IP address on
the network for the first server in the system. The system software assumes that the IP addresses for all
of the servers in the system are contiguous, and assigns the IP addresses accordingly. However, you
can later change the IP addresses of individual servers. The process for doing this is described in
Chapter 7 of the HP StorageWorks Scalable File Share System User Guide.
• Where possible, match server and client interconnect interfaces by network and netmask.
• If the client system is an HP XC system, the IP addresses on the Gigabit Ethernet interconnect must be
in the range of the HP XC system.
• In most HP SFS systems, an alias IP address is only configured on one network, but it is possible to
configure an alias on each Gigabit Ethernet network. Where a dual Gigabit Ethernet interconnect is
used, if you configure an alias on one of the interconnect networks, you must also configure an alias
on the second interconnect network.
In this release of the HP SFS software, client nodes use the alias IP address to access information
about all file systems in the HP SFS system. Later releases of the HP SFS software may require that
each individual file system has a dedicated IP address that client nodes can use to access information
about the file system. If possible, please reserve an IP address for each of the file systems that you
plan to create, so that the addresses can be used in a later release if necessary.
When you are installing the servers, you will be asked to supply the following information for each Gigabit
Ethernet network that is detected:
• The IP address of the first server in the system on the Gigabit Ethernet network.
• The network netmask.