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Re: Re: Future plans for raw devices ?

From: Max Pyziur <pyz(at)panix(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Subject: Re: Re: Future plans for raw devices ?
Date: 2000-06-02 16:53:57
Message-ID: Pine.NEB.4.21.0006021252440.19532-100000@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.

> >
> >  IMHO now is not in PG background for features like I/O raw or on-line
> > replication. It needs better storage layout and tablespace feature.
>
> Vadim is working on storage layout for 7.2, and replication should be
> done after WAL is implemented.
>
> --
>   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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