PCIe 4.0 HBA's?

Discussion in 'RAID Controllers and Host Bus Adapters' started by jeffarese, Sep 12, 2019.

  1. jeffarese

    jeffarese New Member

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    I was wondering if there's going to be HBA's that use PCIe 4.0 so there can be double the ports in a single HBA, it would be good for a x570 powered NAS.
     
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  2. Evan

    Evan Well-Known Member

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    I am sure we will see them soon, HBA from LSI today support even NVMe so PCI4 makes total sense then.
     
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  3. Patrick

    Patrick Administrator
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  4. jeffarese

    jeffarese New Member

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    Nice!

    I think that makes X570 a very interesting choice for a low-power yet powerful NAS, since you could easily add more drives than you could fit in almost any case with some PCIe 4.0 lanes

    What do you think?
     
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  5. nezach

    nezach Active Member

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    PCIe 4.0 cards from LSI will be based on Aero/Sea (3816/3916) controllers. They have been working on adding mpt3sas driver support for a while.

    Here is one recent commit describing different performance modes that will be supported by new controllers

    scsi: mpt3sas: Introduce perf_mode module parameter ยท torvalds/linux@ca7e1e9

    The most interesting bit of info from that commit:

    Code:
    4k Random Read IO performance numbers on 24 SAS SSD drives for above three
    permormance modes. Performance data is from Intel Skylake and HGST SS300
    (drive model SDLL1DLR400GCCA1).
    
    IOPs:
     -----------------------------------------------------------------------
      |perf_mode    | qd = 1 | qd = 64 |   note                             |
      |-------------|--------|---------|-------------------------------------
      |balanced     |  259K  |  3061k  | Provides max performance numbers   |
      |             |        |         | both on lower QD workload &        |
      |             |        |         | also on higher QD workload         |
      |-------------|--------|---------|-------------------------------------
      |iops         |  220K  |  3100k  | Provides max performance numbers   |
      |             |        |         | only on higher QD workload.        |
      |-------------|--------|---------|-------------------------------------
      |latency      |  246k  |  2226k  | Provides good performance numbers  |
      |             |        |         | only on lower QD worklaod.         |
      -----------------------------------------------------------------------
    
    Avarage Latency:
      -----------------------------------------------------
      |perf_mode    |  qd = 1      |    qd = 64           |
      |-------------|--------------|----------------------|
      |balanced     |  92.05 usec  |    501.12 usec       |
      |-------------|--------------|----------------------|
      |iops         |  108.40 usec |    498.10 usec       |
      |-------------|--------------|----------------------|
      |latency      |  97.10 usec  |    689.26 usec       |
      -----------------------------------------------------
     
    #5
    T_Minus, Aluminat, Evan and 1 other person like this.
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