46 Sun StorageTek 2500 Series Array Hardware Installation Guide • September 2009
Connecting Drive Expansion Trays
Keep the following points in mind when adding expansion trays to your storage
array:
■ Once the drive expansion tray is physically installed, the expansion trays should
be turned on and connected to the array with power on. The array must be at an
optimal status with I/O data transfer turned off. If you need to add an expansion
tray to a storage array that cannot be taken off-line, contact your Sun Technical
Support representative before attempting to connect the new tray.
■ Controller trays 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 I/O modules, and channel two through the B-
side controller and I/O modules). The SAS cable from the expansion port on a
controller connects to the In port (Up arrow) on an expansion tray I/O module.
The SAS cable from an I/O module on expansion tray 1 to a corresponding I/O
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 expansion tray on a channel. See
FIGURE 2-20 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 I/O modules in the opposite order as the expansion tray A-
side I/O modules. That means the last I/O module in the A-side chain from
controller A must be the first I/O module in the B-side chain from controller B. See
FIGURE 2-20 for an illustration of cabling for maximum tray level redundancy.
■ On all SAS cables, affix a label to each end of the cable. See “Tray Interconnect
Cable Labeling” on page 52 for labeling tips.
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