Chapter 3: Connecting Hosts
Connect Two Storage Systems to Replicate Volumes
QX and QXS Setup Guide
112
Multiple Servers/Multiple Switches/Two Locations
Virtual Local Area Network (VLAN) and zoning can be employed to provide separate networks for iSCSI
and FC, respectively. Whether using a single switch or multiple switches for a particular interface, you can
create a VLAN or zone for I/O and a VLAN or zone for replication to isolate I/O traffic from replication traffic.
Since each switch would include both VLANs or zones, the configuration would function as multiple
networks.
Figure 102:
Multiple Servers/Multiple Switches/Two Locations
6Gb/s
6Gb/s
6Gb/s
6Gb/s
Remote site "A"
Switch (replication)
I/O switch
To host servers
Remote site "B"
To host servers
I/O switch
Note:
Although not shown in the preceding cabling examples, you can cable replication-enabled QXS-
3 Series systems and compatible QXS-4 Series systems—via switch attach—for performing replication
tasks.
QXS-4 and QXS-6 Series CNC Ports and Replication
CNC controller modules can use qualified SFP options of the same type, or they can use a combination of
qualified SFP options supporting different host interface protocols. If you use a combination of different
protocols, then CNC ports 0 and 1 must be set to FC (either both16 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).
Each of the following diagrams show the rear panel of two RAID chassis equipped with dual-controller I/O
modules.
Note:
Whereas linear storage supports FC and iSCSI host interface protocols for replication, virtual
storage supports iSCSI host interface protocol for replication. Both linear and virtual storage support all
qualified CNC options for host connection.
