Re: Very poor read performance, query independent

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Right, that is a bit of a show stopper for those SSD (the Intel needs SATA 6Gb/s and the Sammy's need PCIe 3.0 to perform to their rated specs).

regards

Mark


On 16/07/17 04:12, Charles Nadeau wrote:
Mark,

The server is a . It doesn't really work with SATA drives. And when you find one that is compatible, it is only used at 3Gb/s with a maximum of 50000 IOPS (a well know caracteristic of the HP P410i SAS RAID controller). I am looking at getting a Kingston Digital HyperX Predator that I could use in one of the PCIe 2.0 x4 slot. However I am worried about the "thermal runaway", i.e. when the server can't get a temperature reading from a PCIe card, it spins the fans at full speed to protect the server against high temperature. The machine being next to my desk I worry about the deafening noise it will create.
Thanks!

Chales

On Sat, Jul 15, 2017 at 1:57 AM, Mark Kirkwood <mark.kirkwood@xxxxxxxxxxxxxxx <mailto:mark.kirkwood@xxxxxxxxxxxxxxx>> wrote:

    Thinking about this a bit more - if somewhat more blazing
    performance is needed, then this could be achieved via losing the
    RAID card and spinning disks altogether and buying 1 of the NVME
    or SATA solid state products: e.g

    - Samsung 960 Pro or Evo 2 TB (approx 1 or 2 GB/s seq scan speeds
    and 200K IOPS)

    - Intel S3610 or similar 1.2 TB (500 MB/s seq scan and 30K IOPS)


    The Samsung needs an M.2 port on the mobo (but most should have
    'em - and if not PCIe X4 adapter cards are quite cheap). The Intel
    is a bit more expensive compared to the Samsung, and is slower but
    has a longer lifetime. However for your workload the Sammy is
    probably fine.

    regards

    Mark

    On 15/07/17 11:09, Mark Kirkwood wrote:

        Ah yes - that seems more sensible (but still slower than I
        would expect for 5 disks RAID 0).




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Charles Nadeau Ph.D.
http://charlesnadeau.blogspot.com/



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