From: Guillaume Cottenceau <gc@mnc.ch>
To: Laszlo Nagy <gandalf@designaproduct.biz>
Cc: pgsql-performance@postgresql.org
Subject: Re: Poor performance on seq scan
Date: 12 Sep 2006 14:36:22 +0200
Message-ID: <874pvdxnw9.fsf@meuh.mnc.lan> (raw)
In-Reply-To: <4506A4E2.706@designaproduct.biz>
References: <3E37B936B592014B978C4415F90D662D04589725@MI8NYCMAIL06.Mi8.com>
<4506A4E2.706@designaproduct.biz>
Laszlo Nagy <gandalf 'at' designaproduct.biz> writes:
> This is a mirrored disk with two SATA disks. In theory, writing should
> be slower than reading. Is this a hardware problem? Or is it that
> "sync" did not do the sync?
SATA disks are supposed to be capable of lying to pg's fsync (pg
asking the kernel to synchronize a write and waiting until it is
finished). Same can probably happen to the "sync" command.
--
Guillaume Cottenceau
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To: pgsql-performance@postgresql.org
Cc: gc@mnc.ch, gandalf@designaproduct.biz
Subject: Re: Poor performance on seq scan
In-Reply-To: <874pvdxnw9.fsf@meuh.mnc.lan>
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