Re: Re: Future plans for raw devices ?

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Karel Zak <zakkr(at)zf(dot)jcu(dot)cz>
Cc: norbert(dot)meissner(at)str(dot)daimler-benz(dot)com, Ohgaki Yasuo <yasuo_ohgaki(at)hotmail(dot)com>, pgsql-admin(at)postgresql(dot)org
Subject: Re: Re: Future plans for raw devices ?
Date: 2000-06-02 16:12:24
Message-ID: 200006021612.MAA16394@candle.pha.pa.us
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> > 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.

>
> 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

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