From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Markus Schaber <schabi@logix-tt.com>
Cc: PostgreSQL General <pgsql-general@postgresql.org>
Cc: Pgsql-Performance ((E-mail)) <pgsql-performance@postgresql.org>
Subject: Re: [PERFORM] Arguments Pro/Contra Software Raid
Date: Wed, 10 May 2006 10:01:33 -0400 (EDT)
Message-ID: <200605101401.k4AE1XQ08859@candle.pha.pa.us> (raw)
In-Reply-To: <4461F0A3.60102@logix-tt.com>
Markus Schaber wrote:
> Hi, Scott & all,
>
> Scott Lamb wrote:
>
> > I don't know the answer to this question, but have you seen this tool?
> >
> > http://brad.livejournal.com/2116715.html
>
> We had a simpler tool inhouse, which wrote a file byte-for-byte, and
> called fsync() after every byte.
>
> If the number of fsyncs/min is higher than your rotations per minute
> value of your disks, they must be lying.
>
> It does not find as much liers as the script above, but it is less
Why does it find fewer liers?
---------------------------------------------------------------------------
> intrusive (can be ran on every low-io machine without crashing it), and
> it found some liers in-house (some notebook disks, one external
> USB/FireWire to IDE case, and an older linux cryptoloop implementations,
> IIRC).
>
> If you're interested, I can dig for the C source...
>
> HTH,
> Markus
>
>
>
>
> --
> Markus Schaber | Logical Tracking&Tracing International AG
> Dipl. Inf. | Software Development GIS
>
> Fight against software patents in EU! www.ffii.org www.nosoftwarepatents.org
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
>
--
Bruce Momjian http://candle.pha.pa.us
EnterpriseDB http://www.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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To: pgsql-performance@postgresql.org
Cc: pgman@candle.pha.pa.us, schabi@logix-tt.com, pgsql-general@postgresql.org
Subject: Re: [PERFORM] Arguments Pro/Contra Software Raid
In-Reply-To: <200605101401.k4AE1XQ08859@candle.pha.pa.us>
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