Re: Tuning the configuration

From: "Graeme B(dot) Bell" <grb(at)skogoglandskap(dot)no>
To: Evgeniy Shishkin <itparanoia(at)gmail(dot)com>
Cc: Andrea Suisani <sickpig(at)opinioni(dot)net>, "mfatticcioni(at)mbigroup(dot)it" <mfatticcioni(at)mbigroup(dot)it>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Tuning the configuration
Date: 2014-12-16 11:51:19
Message-ID: BB91D876-5FE8-4938-9FEF-8984861E1536@skogoglandskap.no
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>
> I don't understand the logic behind using drives,
> which are best for random io, for sequent io workloads.

Because they are also best for sequential IO. I get 1.3-1.4GB/second from 4 SSDs in RAID or >500MB/s for single disk systems, even with cheap models.
Are you getting more than that from high-end spinning rust?

Graeme.

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