Things To Know - Cabling Configurations For The E5612 And E5624 Controller-Drive Trays - Quantum StorNext QD7000 Installation Manual

1 ESM A
2 ESM B
3 SAS In connectors
4 SAS Expansion (Out) connectors
Things to know - Cabling configurations for the E5612 and
E5624 controller-drive trays
The figures in this section show representative cabling configurations. The configurations shown
guarantee that redundant data paths exist between the controller-drive tray and all attached drive trays
in a storage array. You can attach the E5612 and E5624 controller-drive trays to the following drive
trays:
• DE1600
• DE5600
• DE6600
You can attach the controller-drive trays to various combinations of all three drive tray models.
You must ensure that both controllers have access to all available drive trays by making sure that:
• Expansion port 1 from both controllers is connected to the same ESM in slot A of the first drive
tray in the stack.
• Expansion port 2 from both controllers is connected to the same ESM in slot B of the last drive
tray in the stack.
Except for the ESMs connected directly to the controllers and the last ESMs in the stack, each ESM
should have only a single connection to the ESM that follows it.
The expansion connectors to the drive trays are always on the left side of the controllers
Note:
from the rear view.
You use SAS cables to connect any expansion drive trays to the controller-drive tray. When you
connect the cables, keep the following considerations in mind:
• SAS channels are not tolerant of loops. Except for the ESM connected directly to the controllers,
each ESM should only have a single connection to the ESM before it and a single connection to
the ESM that follows it (unless it is the last ESM in the channel). Do not connect additional
cables to ESMs to provide short-cut paths because this step creates a loop in the topology.
• The drive trays in the chain of connections from controller A are in the reverse order from those
whose connections start from controller B. That is, the last drive tray in the chain from controller
A must be the first drive tray in the chain from controller B.
• It does not matter which of the two SAS In ports on an ESM you use for a connection, but it is
best to follow the conventions described in the documentation so your storage management
software represents the storage array consistently.
• Some SAS ports might have a black plastic plug installed. Remove the plug before you attach a
cable to the port.
• You must confirm that the blue tabs on the SAS cables face the bottom of the cabinet and ensure
that each connector clicks into place.
• One controller drive tray and one DE1600 or DE5600 drive tray
Step 7 - Connecting the controller-drive tray to the drive trays | 83