5.6.x HP X9000 Series Network Storage System Installation Guide (TA768-96056, December 2011)

Scaling out to multiple racks
Two or more X9320/X9300 cluster racks can be interconnected for scale out. As long as the racks
and networks are cabled and configured as shown in this chapter, the scale out can be
accomplished by chaining the cluster network switches together. Interconnecting the switches allows
the cluster network to span racks. As a result, all IP addresses on the cluster network across both
racks must be unique. HP also recommends that you enable spanning-tree on the network switches
to eliminate network loops when expanding the network racks.
66 Network best practices for X9300 and X9320 systems