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Re: Re: Future plans for raw devices ?

From: pyz(at)panix(dot)com
To: pgsql-admin(at)postgresql(dot)org
Subject: Re: Re: Future plans for raw devices ?
Date: 2000-06-02 18:26:58
Message-ID: 200006021826.OAA03521@panix2.panix.com (view raw or flat)
Thread:
Lists: pgsql-admin
> 
> > On Fri, 2 Jun 2000, Bruce Momjian wrote:
> > 
> > > > > Most think that raw devices are a pain and offer little performance
> > > > > improvement and lots of portability and coding problems.
> > > >
> > > >  I don't know how much it is a performance improvement (someone say
> > 10-20%),
> > > > but Bruce is probably right, it is a huge work and with dependence on
> > > > hardware & system implementation.
> > > >
> > > >  We already discussed about it --- it is hacker's archive.
> > >
> > > One intresting issue is that commerical databases that recommended raw
> > > spaces are moving away from them, which helps us to know that the
> > > raw device benefit must be pretty small.
> > 
> > I beg to differ.  Informix (the system my shop uses) blazes using raw
> > devices; Oracle (from what I understand) does also.  Sybase (a resource
> > hog), on the other hand, seems to prefer cooked file systems.
> 
> I know about Informix, but I heard Oracle was moving away from raw
> devices, and the speed improvement was only a few percentage points.

For Informix it's far more than a few percentage points; and then 
when you add striping you move even faster.
 
> -- 
>   Bruce Momjian                        |  http://www.op.net/~candle
>   pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
>   +  If your life is a hard drive,     |  830 Blythe Avenue
>   +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026
> 


Max Pyziur                                     BRAMA - Gateway Ukraine
pyz(at)brama(dot)com                                  http://www.brama.com/

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