public inbox for [email protected]
help / color / mirror / Atom feedFrom: Charles Nadeau <[email protected]>
To: Mark Kirkwood <[email protected]>
Cc: pgsql-performa. <[email protected]>
Subject: Re: Very poor read performance, query independent
Date: Sat, 15 Jul 2017 18:12:25 +0200
Message-ID: <CADFyZw4D_DOEEtfLYSjomZoXF5Y7MDBHQCXQskTGVQbzr842fQ@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CADFyZw7aGoD0AaStxdyHByR5Qta=M5wx0v=iptKLhPUp+EOKvA@mail.gmail.com>
<[email protected]>
<CADFyZw4UanW5TbFajWKWhN9XcW+8gtCXw+kssHo47Wpr1A=zJw@mail.gmail.com>
<DM5PR07MB28103FD558CB6628CECE07BEDAA90@DM5PR07MB2810.namprd07.prod.outlook.com>
<CADFyZw6JrhsLR_eYOeCjjiQMzz5bepk6AfMRBu0hnaQg+vN-=A@mail.gmail.com>
<[email protected]>
<CADFyZw5-WzdkACN39-ND9tvBwmvfdEhFaYL3Ds82a3Rwav-neA@mail.gmail.com>
<[email protected]>
<[email protected]>
List-Unsubscribe: <mailto:[email protected]?body=unsub%20pgsql-performance>
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 <
[email protected]> 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).
>>
>
>
>
> --
> Sent via pgsql-performance mailing list ([email protected])
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-performance
>
--
Charles Nadeau Ph.D.
http://charlesnadeau.blogspot.com/
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: [email protected]
Cc: [email protected], [email protected]
Subject: Re: Very poor read performance, query independent
In-Reply-To: <CADFyZw4D_DOEEtfLYSjomZoXF5Y7MDBHQCXQskTGVQbzr842fQ@mail.gmail.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox