Network Configuration - HP D2D Installation And Configuration Manual

Due to complexities in multi-hosting tape devices on SANs, it is best to make use of zoning tools
to help keep the backup/restore environment simple and less susceptible to the effects of changing
or problematic SANs.
Zoning provides a way for servers, disk arrays, and tape libraries to only see what hosts and
targets they need to see and use. The benefits of zoning include but are not limited to:
Limiting unnecessary discoveries on the HP StoreOnce Backup System
Reducing stress on the HP StoreOnce Backup System and its library devices by polling agents
Reducing the time it takes to debug and resolve anomalies in the backup/restore environment
Reducing the potential for conflict with untested third-party products
Zoning may not always be required for configurations that are already small or simple. Typically
the bigger the SAN is, the more zoning is needed. HP recommends the following for determining
how and when to use zoning.
Small fabric (16 ports or less)—may not need zoning.
Small to medium fabric (16 - 128 ports)—use host-centric zoning. Host-centric zoning is
implemented by creating a specific zone for each server or host, and adding only those storage
elements to be utilized by that host. Host-centric zoning prevents a server from detecting any
other devices on the SAN or including other servers, and it simplifies the device discovery
process.
Disk and tape on the same pair of HBAs is supported along with the coexistence of array
multipath software (no multipath to tape or library devices on the HP StoreOnce Backup System,
but coexistence of the multipath software and tape devices).
Large fabric (128 ports or more)—use host-centric zoning and split disk and tape targets.
Splitting disk and tape targets into separate zones will help to keep the HP StoreOnce Backup
System free from discovering disk controllers which it doesn't need to see. For optimal
performance, where practical, dedicate HBAs for disk and tape.
NOTE: Overlapping zones are supported.

Network configuration

Single port configuration is the default mode, but it may easily be changed from the Web
Management Interface.
The two physical network ports provide four network configuration modes (on the HP D2D4300
Series, each pair of same speed physical network ports provide four network configuration modes).
Single Port Configuration: The HP StoreOnce Backup System is connected to one network
only; only one network port is used.
Dual Port Configuration: The HP StoreOnce Backup System is connected to two different
networks. Both network ports are used. The networks must be on different sub-nets.
High Availability (Port Failover) Configuration: This creates a bonded network port to provide
failover, if one port on the switch or HP StoreOnce Backup System fails or if a network cable
fails. To configure this mode both ports must be connected to the same switch (or two multiple
switches which are configured as a single stack using an inter-switch link). This bonding mode
will work with most switches (that support the tool) with no switch configuration required. In
this mode the link will failover if one path is lost, this may still result in the failure of any data
transfer (backup/restore) currently in progress, if the link recovery time results in a backup
application time-out.
High Availability (Link Aggregation) Configuration: This creates a bonded network port to
provide failover and bandwidth aggregation, and it can improve the overall network bandwidth
available. To configure this mode both ports much be connected to the same switch, and the
switch must support and be configured to use "Link Aggregation Control Protocol" (LACP).
42 Advanced installation