Sun Microsystems StorEdge 3000 Series, Руководство по лучшим практикам

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36 Sun StorEdge 3000 Family Best Practices Manual • March 2007
Full-Duplex SAN Tips and Techniques
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In a full-duplex SAN configuration, the switches communicate with the array host
ports using a fabric point-to-point (F_port) mode. This enables transparent
controller fail-over and fail-back without server-resident software. However,
supporting hot-swap servicing of a failed controller requires the use of
multipathing software, such as the Sun StorEdge Traffic Manager, on the
connected servers.
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Use of fabric point-to-point (F_port) connections between an array and fabric
switches limits to 128 the total number of LUNs that can be presented. Fibre
channel standards allow only one ID per port when operating point-to-point
protocols, resulting in a maximum of four IDs, with a maximum of 32 LUNs each,
supporting up to 128 LUNs.
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When a fabric switch is connected to one port of channel 0 or channel 1 of a Sun
StorEdge 3511 SATA array, no connections can be made with the other three ports
of that channel. If channel 0 (port FC 0) is connected to a fabric switch, for
example, the second port for channel 0 on that controller, and the FC 0 ports on a
redundant controller, cannot be used. Similarly, if channel 1 (port FC 1) is
connected to a fabric switch, the second FC 1 port on that controller and the FC 1
ports on a redundant controller cannot be used.