4-22 Sun StorEdge 3000 Family Installation, Operation, and Service Manual • May 2004
4.10 Cabling to Expansion Units
Caution – When connecting expansion units to a RAID array, always connect
channel 2 of the RAID array to the A channel of the expansion units, and connect
channel 3 of the RAID array to the B channel of the expansion units. Otherwise,
unexpected behavior might occur.
Several cabling configurations are possible, each with its own advantages and
disadvantages. Refer to the Sun StorEdge 3000 Family Best Practices Manual for your
array for more information about the suitability of various configurations for various
application requirements, as well as for information about high-capacity
configurations.
The maximum number of expansions units attached to a RAID array are:
■ up to eight expansion units attached to a Sun StorEdge 3510 FC array
■ up to five expansion units attached to a Sun StorEdge 3511 FC array
These configurations are described in the Sun StorEdge 3000 Family Best Practices
Manual for your array.
The examples in
FIGURE 4-18 and FIGURE 4-19 show RAID arrays connected to two
expansion units. Connections to expansion units are designed to keep all A drive
ports on the same loop and all B drive ports on the same loop.
Caution – To avoid drive assignment conflicts, make sure that each connected array
and expansion unit uses a different loop ID, as described in “Setting Loop IDs on
Expansion Units” on page 4-26.
In the RAID array, two of the unused SFP host ports could be used to provide
redundant pathing to the two servers, and the remaining unused SFP host ports
could be connected to two more servers in a redundant configuration.
Similarly, you can connect expansion units to other channels (which are separate
from channels 2 and 3) if you configure them as drive channels. For details, refer to
“Configuring FC Channels as a Host or Drive Channel (Optional)” on page 6-5.
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