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Drive cabling topologies for the E2800 controller shelves
This section provides examples of drive shelf cabling topologies for the E2800 controller shelves.
The E2800 controller shelf models are the E2812, E2824, and E2860. The total number of drive bays
in the storage array, including the drive bays in the controller shelf and those in the drive shelves,
must not exceed 180. The total number of shelves (controller shelves and drive shelves) in a storage
array must not exceed four.
You can cable E2800 controller shelves to SAS-3 drive shelves (DE212C, DE224C, or DE460C),
SAS-2 drive trays (DE1600, DE5600, or DE660) or combinations of SAS-2 and SAS-3 drive shelves.
Use cables with mini-SAS HD (SFF-8644) connectors to connect SAS-3 drive shelves. Use cables
with a mini-SAS (SFF-8088) connector on one end and a mini-SAS HD connector on the other end
to connect SAS-2 drive shelves to the controller shelf. Use cables with a mini-SAS connector on both
ends for connections between SAS-2 drive shelves.
Note:
When you install SAS cables, make sure that the blue tabs on the SAS cables face the
bottom of the tray or shelf and that each connector clicks into place.
Note:
Simplex systems do not provide redundant connections to drive shelves. If a connection or
an IOM fails, all drive shelves that connect to the controller shelf indirectly through the failed
connection or drive shelf become inaccessible.
When you cable a mix of SAS-2 and SAS-3 drive shelves to the same controller shelf, you should use
a dual-stack configuration. Put all of the SAS-3 drive shelves in one stack and all of the SAS-2 drive
shelves in the other stack. Attach expansion port 1 from each controller to the SAS-3 stack and
expansion port two from each controller to the SAS-2 stack.
Drive channel redundancy for the E2800 controller shelves
Learn the physical features of the E2800 controller shelves that support drive cabling to minimize the
risk of losing access to data.
Controller shelves
Each controller in an E2812, E2824, or E2860 controller shelf has two drive ports. On each
controller, the two drive ports connect to the same drive channel (SAS domain). When a controller
shelf has two controllers, the drive channel on controller A and the drive channel on controller B
form a redundant pair.
Note:
To maintain data access in the event of the failure of a controller, an ESM/IOM, or a drive
channel, each drive tray must have a direct connection or an indirect connection (through other
drive trays) to at least one drive port on each controller in a dual-controller configuration.
The following figure shows the drive ports (SAS expansion ports) on a dual-controller configuration
for the E2812 or E2824 controller shelf. The controllers occupy the top half of each shelf. The drive
ports are at the far right of each controller.
Drive shelf or drive tray cabling | 83
Summary of Contents for StorNext QD7000
Page 1: ...Hardware Cabling Guide StorNext QD7000 Firmware 8 40 xx xx 6 68683 01 Rev A...
Page 7: ...Preface Hardware Cabling Guide vii...
Page 10: ...E Series Hardware Cabling Guide December 2017 215 11792_B0 doccomments netapp com...
Page 11: ......
Page 90: ...One E5660 controller drive tray and one DE6600 drive tray Drive shelf or drive tray cabling 81...
Page 106: ...One E2760 controller drive tray and one drive tray Drive shelf or drive tray cabling 97...