Re: [PERFORM] Very poor read performance, query independent

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От Charles Nadeau
Тема Re: [PERFORM] Very poor read performance, query independent
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Msg-id CADFyZw4D_DOEEtfLYSjomZoXF5Y7MDBHQCXQskTGVQbzr842fQ@mail.gmail.com
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Ответ на Re: [PERFORM] Very poor read performance, query independent  (Mark Kirkwood <mark.kirkwood@catalyst.net.nz>)
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Mark,

The server is a HP DL 380 G6. 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@catalyst.net.nz> 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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