Drive tray cabling topologies for the E2712 controller-drive tray and the
E2724 controller-drive tray
Depending on the number of drive trays that you need to connect, see the applicable figure for a
cabling topology. Each example shows a duplex controller-drive tray configuration with redundant
paths to the drive trays. Several options for cabling might be possible for a given drive tray
configuration. You should cable both expansion ports on each controller for improved performance
when two controllers are used.
Dual-stack cabling is recommended for better performance if your storage array includes two or
more expansion drive trays. In dual-stack cabling configurations, the number of drive trays in each
stack should be as balanced as possible. Each stack should have the same number of drive trays for
an even total number of drive trays or the number of drive trays in each stack should differ by one for
an odd total number of drive trays. For a simplex controller-drive tray configurations, do not use the
cabling pattern shown in the figure "One E2700 controller-drive tray and one drive tray
(recommended cabling for improved performance)." Use the cabling topology shown for controller A
in the other figures in this section as a pattern for cabling with a simplex controller-drive tray.
These controller-drive trays can be cabled to SAS-2 drive trays (DE1600, DE5600, and DE6600), or
various combinations of those three models of drive tray. For any one controller-drive tray, you must
not exceed the limit of 15 connected drive trays or the limit for the total number of drive slots in the
storage array.
Note:
The following figures shows the SAS ports on a DE1600 drive tray or a DE5600 drive tray.
You can connect either of the SAS ports labeled SAS 1 and SAS 2 to the SAS Expansion port on
another drive tray or on a controller-drive tray.
One E2700 controller-drive tray and one drive tray (recommended cabling for improved
performance)
Drive shelf or drive tray cabling | 93
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