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44 Sun StorageTek 2500 Series Array Hardware Installation Guide • March 2007
Connecting Expansion Trays
Keep the following points in mind when adding expansion trays to your storage
array:
■ Expansion trays must be added with power to the array and I/O data transfer
turned off. If you need to add an expansion tray to an array that cannot be taken
off-line, contact your Sun Technical Support representative before attempting to
connect the new tray.
■ Controller and expansion trays are shipped with protective plastic plugs in the
SAS expansion ports. You must remove these before connecting cables.
■ Expansion trays are added serially, in a chain (actually two chains: channel one
through the A-side controller and modules, and channel two through the B-side
controller and modules). The SAS cable from the expansion port on a controller
connects to the In port (Up arrow) on an expansion tray drive module. The SAS
cable from a drive module on expansion tray 1 to a corresponding drive module
on expansion tray 2 connects from the Out port on expansion tray 1 to the
corresponding In port on expansion tray 2. This pattern repeats for each
additional drive module on a channel. See
FIGURE 2-19 for an illustration of this
reverse cabling pattern.
■ To connect cables for maximum redundancy, controller B must be cabled to the
expansion tray B-side modules in the opposite order as the expansion tray A-side
modules. That means the last drive module in the A-side chain from controller A
must be the first drive module in the B-side chain from controller B. See
FIGURE 2-19 for an illustration of cabling for maximum tray level redundancy.
■ On all SAS cables, affix a label to each end of the cable. See “Drive Module Cable
Labeling” on page 47 for labeling tips.