Chapter 3: Connecting Hosts
Connect Two Storage Systems to Replicate Volumes
QX and QXS Setup Guide 111
protocols, then CNC ports 0 and 1 must be set to FC (either both 16 Gbit/s or both 8 Gbit/s), and CNC ports
2 and 3 must be set to iSCSI (either both 10GbE or both 1 Gbit/s).
In linear storage environments (V2 disk management utility), each CNC port can perform I/O or replication.
In combination environments, one interface—for example FC—might be used for I/O, and the other
interface type—10GbE or 1 Gb iSCSI—might be used for replication. In virtual storage environments (V3
disk management utility), each CNC port can perform I/O, but replication traffic is supported by iSCSI host
interface ports (either both 10GbE or both 1 Gbit/s).
Multiple Servers/One Switch/One Location
This section provides information on the rear panel of two RAID chassis with both I/O and replication
occurring on the same physical network.
Figure100:Multiple Servers/One Switch/One Location
Multiple Servers/Two Switches/One Location
This section provides information on the CNC host interface connections and CNC-based replication, with
I/O and replication occurring on different networks. For optimal protection, use two switches. Connect one
port from each controller module to the first switch to facilitate I/O traffic, and connect one port from each
controller module to the second switch to facilitate replication. Using two switches in tandem avoids the
potential single point of failure inherent to using a single switch; however, if one switch fails, either I/O or
replication will fail, depending on which of the switches fails.
Figure101:Multiple Servers/Two Switches/One Location
To host server(s)
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