HP StoreOnce 6500 Backup Installation Planning and Preparation Guide

Gateway considerations
When the network subnet is configured, you are prompted to provide an IP address for a gateway,
which will be used to route management and/or data traffic to and from an external network. In
addition, one network subnet will be designated as containing the default gateway.
There are up to three choices when configuring the network:
• No external gateways: If the customer wants to use the HP StoreOnce Backup System in a
totally isolated network environment, they should not configure an external gateway (the HP
support engineer will simply skip this step during configuration)
• One external gateway: This gateway will be used by all subnets if it is selected as default.
• Multiple external gateways: This option is used if the customer wishes to specify different
gateways for different subnets.
NOTE: The default gateway is used to attempt to route traffic to an IP address that is not in any
of the configured subnets and that also does not route via the gateway specified in the subnet from
which the traffic originates.
Understanding Virtual Interface (VIF) addresses
The VIF addresses are key to ensuring continued availability in the event of failover and are assigned
as part of the network configuration process.
There are two instances of VIF addresses: the Cluster Management IP address and Data VIF IPs.
• The StoreOnce Management Console uses the Cluster Management IP address to access the
Backup System from the customer’s network for all manageability tasks. Because this Cluster
Management IP address is dynamic on the system, it can be active on the master node and
passive on the other nodes, but should the master node fail for any reason the Virtual
Management Console simply moves to another node and can still be accessed using the same
Cluster Management IP address.
There is only one Cluster Management IP address per Backup system (or cluster), but each
node requires a physical connection to the Management subnet and the Cluster Management
VIF IP address must be in the subnet range as the Management subnet.
• The Data VIF IP address is associated to a service set, which is the set of services (VTL, NAS,
Catalyst, replication and so on), available for a node. Should the physical node fail, the
service set will failover to the other node in the couplet and the Data VIF IP address will also
failover to be used by the corresponding physical ports on the other node. No change is
needed to the IP address of the service set, allowing hosts and the StoreOnce Backup System
to function correctly. Each couplet has two nodes and, therefore, two service sets. The number
of Data VIF IP addresses per service set depends upon the number and type of data subnets
that have been configured.
IMPORTANT: The Cluster Management IP address is the address that you need to access the
StoreOnce Management functions. The Data VIF IP addresses are the IP addresses that you need
to configure Catalyst and NAS backup targets, VTL and NAS replication configurations and Catalyst
copy jobs The HP service engineer will leave you with a record of these addresses after installation
and you can also use the StoreOnce CLI (command line interface) to display them.
Number of IP addresses required
You should ensure that you have sufficient IP addresses to cover both the physical IP and the virtual
IP addresses that the HP StoreOnce Backup System requires during network configuration. The
24 Connecting to your network