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Re: [HACKERS] Performance while loading data and indexing

From: Rod Taylor <rbt(at)rbt(dot)ca>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: Neil Conway <neilc(at)samurai(dot)com>,Greg Copeland <greg(at)CopelandConsulting(dot)Net>,shridhar_daithankar(at)persistent(dot)co(dot)in,PostgresSQL Hackers Mailing List <pgsql-hackers(at)postgresql(dot)org>,PostgresSQL General Mailing List <pgsql-general(at)postgresql(dot)org>
Subject: Re: [HACKERS] Performance while loading data and indexing
Date: 2002-09-26 22:03:36
Message-ID: 1033077816.27772.9.camel@jester (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-hackerspgsql-performance
On Thu, 2002-09-26 at 17:47, Bruce Momjian wrote:
> Rod Taylor wrote:
> > > Yes, before UFS had soft updates, the synchronous nature of UFS made it
> > > slower than ext2, but now with soft updates, that performance difference
> > > is gone so you have two files systems, ext2 and ufs, similar peformance,
> > > but one is crash-safe and the other is not.
> > 
> > Note entirely true.  ufs is both crash-safe and quick-rebootable.  You
> > do need to fsck at some point, but not prior to mounting it.  Any
> > corrupt blocks are empty, and are easy to avoid.
> 
> I am assuming you need to mount the drive as part of the reboot.  Of
> course you can boot fast with any file system if you don't have to mount
> it.  :-)

Sorry, poor explanation.

Background fsck (when implemented) would operate on a currently mounted
(and active) file system.  The only reason fsck is required prior to
reboot now is because no-one had done the work.

http://www.freebsd.org/cgi/man.cgi?query=fsck&sektion=8&manpath=FreeBSD+5.0-current

See the first paragraph of the above.
-- 
  Rod Taylor


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