From: Scott Marlowe <scott.marlowe@gmail.com>
To: Scott Carey <scott@richrelevance.com>
Cc: Ron Mayer <rm_pg@cheapcomplexdevices.com>
Cc: Greg Smith <gsmith@gregsmith.com>
Cc: Henrik <henke@mac.se>
Cc: pgsql-performance@postgresql.org
Subject: Re: Filesystem benchmarking for pg 8.3.3 server
Date: Tue, 12 Aug 2008 18:48:04 -0600
Message-ID: <dcc563d10808121748o79a6f667tdec70c96a06b81f9@mail.gmail.com> (raw)
In-Reply-To: <a1ec7d000808121723m19b33fdk281a09434ecd5309@mail.gmail.com>
References: <32A7A76B-16CA-4CDB-AD43-973AD6A3FC7B@mac.se>
<Pine.GSO.4.64.0808081835320.21924@westnet.com>
<48A2050D.4050803@cheapcomplexdevices.com>
<a1ec7d000808121723m19b33fdk281a09434ecd5309@mail.gmail.com>
On Tue, Aug 12, 2008 at 6:23 PM, Scott Carey <scott@richrelevance.com> wrote:
> Some SATA drives were known to not flush their cache when told to.
> Some file systems don't know about this (UFS, older linux kernels, etc).
>
> So yes, if your OS / File System / Controller card combo properly sends the
> write cache flush command, and the drive is not a flawed one, all is well.
> Most should, not all do. Any one of those bits along the chain can
> potentially be disk write cache unsafe.
I can attest to the 2.4 kernel not being able to guarantee fsync on
IDE drives. And to the LSI megaraid SCSI controllers of the era
surviving numerous power off tests.
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To: pgsql-performance@postgresql.org
Cc: scott.marlowe@gmail.com, scott@richrelevance.com, rm_pg@cheapcomplexdevices.com, gsmith@gregsmith.com, henke@mac.se
Subject: Re: Filesystem benchmarking for pg 8.3.3 server
In-Reply-To: <dcc563d10808121748o79a6f667tdec70c96a06b81f9@mail.gmail.com>
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