Re: asm vs raw - the smackdown

From: ~Jeff~ <jifjif_at_gmail.com>
Date: Fri, 29 May 2009 07:01:57 +1200
Message-ID: <363634910905281201g40f1d1b2oa85eb7640d8dc23a_at_mail.gmail.com>

thanks for all your considered replies.
-Jeff Wong

2009/5/28 Greg Rahn <greg_at_structureddata.org>

> Both ASM and raw use the exact same system calls to issue I/O, so
> there is no performance difference based on function calls/call stack.
>
> The ASM advantage is in the automatic striping of data over the LUNs
> (ASM disks) - the ASM logical layer. This reduces time to implement a
> well performing db layout as well as maintenance (disk additions &
> rebalanced) in the future. In other words, it takes much more time
> and effort to create a good layout with raw than it does with ASM.
>
>
> On Wed, May 27, 2009 at 1:30 AM, ~Jeff~ <jifjif_at_gmail.com> wrote:
> > Hi all
> > does anyone know of any papers or study comparing ASM vs raw performance?
> > We have a vendor deadset on raw, and the DbAs would rather not have to
> deal
> > with that!
> > thanks-
> > Jeff Wong
>
>
>
> --
> Regards,
> Greg Rahn
> http://structureddata.org
>

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Received on Thu May 28 2009 - 14:01:57 CDT