Plugging in a P4 breakout cable?

Discussion in 'RAID Controllers and Host Bus Adapters' started by F1ydave, Dec 11, 2018.

  1. F1ydave

    F1ydave Member

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    Assembling my new octocore dual cpu home lab...

    I have this breakout cable (Supermicro CBL 0097L-03). Where do I plug in the P4 and what is its purpose? It looks like it could plug into the pins next to the white SAS/SATA on the motherboard (pic attached/linked), but its wired next to the Female ends of the SATA cable.

    I am not sure if it's meant to plug into some sort of internal drive cage controller or the motherboard. Maybe it's not needed?

    Any help would be appreciated.

    Thank you,
    Dave

    (https://store.supermicro.com/media/...f139433887a97daa66f/c/b/cbl-0097l-03_head.jpg)
    [​IMG]
    [​IMG]
     
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  2. EffrafaxOfWug

    EffrafaxOfWug Radioactive Member

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    The P4 is, IIRC, the SGPIO signal for the SATA ports; the idea being that you plug the 8087 connector to the motherboard and the P4 plug to the backplane; not all backplanes will support this, and if you're using a backplane with an 8087 or 8643 connector itself, the SGPIO should already be in-band.

    I've got a couple of these cables myself but I've not got any backplanes I've used them with.
     
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  3. F1ydave

    F1ydave Member

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    Ok, so it is for a backplane.

    Do you know if I can still run the SATA cables without the use of the P4 cable plugged in? I would like to use the onboard SAS to 4 - 4tb drives.

    If I can't it's not the end of the world as I was already running a SAS 9211-8i PCI from my last home lab. I was just hoping to have the option to add 4 more drives.
     
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    Last edited: Dec 11, 2018
  4. EffrafaxOfWug

    EffrafaxOfWug Radioactive Member

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    Yup, the SATA data will work just fine with or without the SGPIO in use.
     
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  5. F1ydave

    F1ydave Member

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    That's what I suspected. I already plugged them in :D
     
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