Re: Tuning guidelines for server with 256GB of RAM and SSDs?

From: Kaixi Luo <kaixiluo(at)gmail(dot)com>
To: "Wes Vaske (wvaske)" <wvaske(at)micron(dot)com>, Merlin Moncure <mmoncure(at)gmail(dot)com>
Cc: postgres performance list <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Tuning guidelines for server with 256GB of RAM and SSDs?
Date: 2016-07-07 21:06:53
Message-ID: CAHo5iyh2ePUGdtCLEZijW0x_eGNk_toj37n74iGka09SVxY1Qg@mail.gmail.com
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> Regarding write back cache:
> Disabling the write back cache won't have a real large impact on the
> endurance of the drive unless it reduces the total number of bytes written
> (which it won't). I've seen drives that perform better with it disabled and
> drives that perform better with it enabled. I would test in your
> environment and make the decision based on performance.
>
>
Thanks. I assume you are referring to the write back cache on the RAID
controller here and not the disk cache itself.

Kaixi

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