Power and Cabling

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The power and cabling of your StorSimple system can vary based on the actual appliance model. All the models except for the 7520 consist of a single head unit only. The 7520 has a head unit and an EBOD enclosure. The details of power and cabling for these models is covered in the following sections:


Power and Cabling for all models except 7520

For the power and cabling of your appliance, perform the following steps:

  1. Ensure that the power switches on each of the power supplies are in the OFF position. 
  2. Connect the power cords to both the PCMs (as identified in red in the diagram below) in the head unit. 
  3. Attach the power cords to the rack power distribution units as shown below. Ensure the two PCMs use separate power sources.​
  4. Power up the system by flipping the power switches on both the PCMs to the ON position.


Note.png Note: The user should strictly adhere to the power and cabling scheme shown in diagram below to ensure high availability of the system.






Power and Cabling for 7520

The 7520 model contains two enclosures: a ‘head unit’ and an ‘EBOD unit’. These two units are shipped in two separate boxes that are taped together on the same pallet.

Once the ‘head unit’ and ‘EBOD unit’ are removed from the box, it is important to confirm that the ‘head unit’ has a serial number that matches the serial number on the ‘EBOD unit’ before racking and powering up the units.  This procedure is particularly important in situations where a customer may have ordered multiple 7520 appliances as the ‘head unit’ and ‘EBOD unit’ can get mixed up amongst the various 7520s.

Note.png Note: It is essential that the ‘head unit’ is deployed with the ‘EBOD unit’ that has a matching serial number. Failure to do so will result in a scenario where the unit goes into an offline and unusable state and will require manual intervention from support. 


The following information will help identify the serial number information on the ‘head unit’ and ‘EBOD unit’.

Identifying the serial numbers

There is a product label on the inside of the right “ear” (as viewed from the rear) of the ‘head unit’ and ‘EBOD unit’ hardware. The product label contains the serial number information. The picture below shows the rear view of the ‘head unit’ and ‘EBOD unit’, highlighting the product label.


Matching the serial number

Once the product label has been identified on the rear of the ‘head unit’ and ‘EBOD unit’, you will need to locate the serial number on the product label and verify the number on the ‘head unit’ matches the serial number on the ‘EBOD unit’. The below picture highlights the serial number information on the product label for both the ‘head unit’ and ‘EBOD unit’.  


Power and Cabling Steps

For the power and cabling of this model, perform the following steps:

  1. Identify the head unit and the EBOD enclosure. The EBOD enclosure has two stickers marked 'EBOD' in its back plane. See the diagram below for guidance.
  2. Ensure that the power switches on all the PCMs are in the OFF position.
  3. For the head unit, connect the power cords to both the PCMs (as identified in red in the diagram below). 
  4. Ensure the two PCMs of the head unit use separate power sources.
  5. Attach the power cords to the rack power distribution units as shown below. 
  6. Repeat steps 3-5 for the EBOD enclosure.
  7. The EBOD enclosure now needs to be connected to the head unit.
    1. Identify Controller 0, Controller 1, EBOD 0  and EBOD 1 in the appliance backplane. See figure below for guidance.
    2. Use the SAS cables to connect EBOD 0 to Controller 0 and EBOD 1 to Controller 1.
    3. Note that SAS port A on Controller 0 should be connected to SAS port A (as identified by a 'CTRL' sticker) on EBOD 0, and SAS port A on Controller 1 to SAS port A (as identified by a 'CTRL' sticker) on EBOD 1.
  8. Power up the EBOD enclosure first by flipping the power switches on both the PCMs to the ON position.
  9. Verify that the EBOD enclosure is powered up by checking the EBOD controller LEDs (green LED) have turned ON. 
  10. Finally, power up the head unit by flipping both the PCM switches to the ON position.
  11. Verify that the system is up by checking the appliance controller LEDs have turned ON.
  12. Verify that the connection between EBOD controller and appliance controller is OK by ensuring the SAS LEDs (4 LEDs next to the SAS port) on the EBOD controller are green.






Network Cabling for all models

Your device is an active-standby configuration: at any given time, one controller module is active and processing all disk and network operations while the other controller module is standby. In the event of a controller failure, the standby controller immediately activates and continues all the disk and networking operations.

To support this redundant controller failover, you need to cable your device network as shown in the following steps.

1.     Your device has four 1Gbps network interfaces on each controller. Identify the various network ports in the back plane of your device.




2.     For high availability, the device requires a minimum of two connections for each controller.

a.     The MGMT port is automatically enabled and configured via serial console interface on the device itself. Apart from MGMT, another data port also needs to be configured, using the Web UI.

b.    Identify identical network interfaces on each controller. For instance, if you choose to connect MGMT and DATA3 for one of the controllers, you need to connect the corresponding MGMT and DATA3 on the other controller.

3.     Connect

a.    Identical interfaces on both controllers using network cables to ensure availability through a controller failure.

b.    Interfaces from each controller to at least two different switches to ensure availability through a switch failure.

c.    MGMT port to the primary LAN (network with internet access). The other data ports can be connected to SAN/iSCSI LAN (VLAN) segment of the network, depending on intended role.

At a minimum, one network interface needs to be configured for cloud access and one for iSCSI. For high availability and performance, all four network interfaces on each controller need to be configured. See the following diagram for network cabling.






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