From: Chris Mair <list@1006.org>
To: Robert Lor <Robert.Lor@Sun.COM>
Cc: Josh Berkus <josh@agliodbs.com>
Cc: Mark Kirkwood <markir@paradise.net.nz>
Cc: pgsql-performance@postgresql.org
Cc: llonergan@greenplum.com
Subject: Re: bad performance on Solaris 10
Date: Mon, 10 Apr 2006 23:05:22 +0200
Message-ID: <1144703122.3686.7.camel@dell.home.lan> (raw)
In-Reply-To: <1144438174.3729.20.camel@dell.home.lan>
References: <1144111178.3723.80.camel@dell.home.lan>
<1144279780.5133.19.camel@dell.home.lan>
<44346DAA.2080905@paradise.net.nz>
<200604052135.14326.josh@agliodbs.com>
<1144303269.3718.4.camel@dell.home.lan>
<4434C505.1000205@sun.com>
<1144438174.3729.20.camel@dell.home.lan>
> > Chris,
> > Just to make sure the x4100 config is similar to your Linux system, can
> > you verify the default setting for disk write cache and make sure they
> > are both enabled or disabled. Here's how to check in Solaris.
> > As root, run "format -e" -> pick a disk -> cache -> write_cache -> display
> >
> > Not sure how to do it on Linux though!
> >
> > Regards,
> > -Robert
>
> I don't have access to the machine for the next few days due to eh...
> let's call it firewall accident ;), but it might very well be that it
> was off on the x4100 (I know it's on the smaller Linux box).
>
> That together with the bad default sync method can definitely explain
> the strangely slow out of box performance I got.
>
> So thanks again for explaining this to me :)
>
> Bye, Chris.
Just for completeness:
I checked now using the above commands and can confirm the write cache
was disabled on the x4100 and was on on Linux.
Bye, Chris.
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To: pgsql-performance@postgresql.org
Cc: list@1006.org, Robert.Lor@Sun.COM, josh@agliodbs.com, markir@paradise.net.nz, llonergan@greenplum.com
Subject: Re: bad performance on Solaris 10
In-Reply-To: <1144703122.3686.7.camel@dell.home.lan>
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