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02-07-2021

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x3850 X5 backplane cable connections

2021-02-08, 9:56 AM

Hello community!

 

I have an x3850 X5 with two backplanes for 8 disk support. Three types of cables goes to those backplanes. Data, power and status (right?). The power and status cables are Y-cables to the motherboard.

Is it important that the Y cables goes to the right backplane? Can these be connected incorrectly? Ofcause if you switch the data cables then the disks will appear out of order in the front. But can connecting the other two cables incorrect prevent the server from starting up?

 

Best regards,

- Morten Green Hermansen

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13 Posts

02-07-2021

Denmark

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  • Posts: 13
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Re:x3850 X5 backplane cable connections

2021-02-18, 4:47 AM

Hello!

 

Now I have finally tested this. My conclusion is:

 

In a setup in an X3850 X5 with two backplanes (8 disks), the two Y-cables needs to be connected as follows:

The 'Configuration' Y-cable with the Part Number label should go to the topmost backplane (disk 4-7) and the other to the lower backplane.

The 'Power' Y-cable with the Part Number label should also go to the topmost backplane  and the other to the lower backplane.

 

Best regards,

- Morten Green Hermansen

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741 Posts

08-06-2018

United States of America

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Re:x3850 X5 backplane cable connections

2021-02-09, 7:29 AM

Hi Sir,

 

 

If you install hard drive backplane there are three types of cables goes to those backplanes, SAS, SAS power and configuration cables. According to the System X3850 X5 documentation section Installing a 2.5-inch hard disk drive backplane, SAS power and configuration cable should connect the microprocessor board directly. Please find more detail from below pictures.

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13 Posts

02-07-2021

Denmark

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  • Posts: 13
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Re:x3850 X5 backplane cable connections

2021-02-09, 11:15 AM

Hello!

 

Thanks for the reply but in this case I have TWO backplanes. So the two Y cables that goes from the motherboard to each of the backplanes (one for power and one for configuration).

As can be seen from the attached image (I have removed the data cables to uncomplicate things), there are two Y cables.

Is that important which end of the Y cable is going to which backplane?

 

https://forums.lenovo.com/uploads/topic/202102/1612869105961.jpeg

 

Best regards,

- Morten Green Hermansen

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741 Posts

08-06-2018

United States of America

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Re:x3850 X5 backplane cable connections

2021-02-09, 14:41 PM

Hi Sir,

 

You can refer System X3850 X5 SAS-backplane connectors to find the hard disk drive connectors on a SAS backplane. I think both SAS power and configuration cables can be connected to different backplane without definition. But when you connect the two SAS signal cables to the ServeRAID adapter. You should connect the cable from the bottom backplane to port 0 and the cable from the new top backplane to port 1. 
 

The following graphics show the port numbers on the ServeRAID adapters.

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13 Posts

02-07-2021

Denmark

13 Signins

75 Page Views

  • Posts: 13
  • Registered: ‎02-07-2021
  • Location: Denmark
  • Views: 75
  • Message 5 of 5

Re:x3850 X5 backplane cable connections

2021-02-18, 4:47 AM

Hello!

 

Now I have finally tested this. My conclusion is:

 

In a setup in an X3850 X5 with two backplanes (8 disks), the two Y-cables needs to be connected as follows:

The 'Configuration' Y-cable with the Part Number label should go to the topmost backplane (disk 4-7) and the other to the lower backplane.

The 'Power' Y-cable with the Part Number label should also go to the topmost backplane  and the other to the lower backplane.

 

Best regards,

- Morten Green Hermansen

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