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Switch Zoning
Overview
Because of possible restrictions at the host level, the supported Synchronous
Mirroring configurations contain Fibre Channel switches. These Fibre Channel
switches are zoned so that a single host adapter can access only one controller per
storage array. Additionally, all configurations use a separate zone for the ports that are
reserved for the Synchronous Mirroring premium feature.
NOTE Do not zone the uplink port (E_port) that connects (cascades) switches within
a fabric.
Switch zoning configurations are typically set up by using the switch management
software that is provided by the manufacturer of the Fibre Channel switch. This
software should have been included with the materials that are provided when the
switch was purchased.
When two or more Fibre Channel switches are cascaded together, the switch
management software combines the ports for all of the switches that are linked. For
example, if two 16-port Fibre Channel switches are cascaded with a physical
connection using a Fibre Channel cable, the switch management software shows ports
0 through 31 participating in the fabric rather than two switches each with ports 0
through 15. Therefore, a zone that is created containing any of these ports can exist on
multiple cascaded switches.
The following figure shows both cascaded and non-cascaded switches. The top-half
of the figure shows a set of cascaded switches that are on the same network.
Therefore, Zone 1 is the same zone on Switch 1A as Zone 1 is on Switch 1B. In a
single-mode Fibre Channel environment, the two switches are connected by a single
port on each switch that is designated as an E_port, which is not in a zone.
The set of switches in the bottom half of the following figure is on the same network
but is not cascaded. Although both sets contain a Zone 1 (shown as Zone A in Switch
2), these zones are independent of each other.
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