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 |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general pgsql-hackers pgsql-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
From | Date | Subject | |
---|---|---|---|
Next Message | Bruce Momjian | 2002-09-26 22:04:52 | Re: [HACKERS] Performance while loading data and indexing |
Previous Message | Joe Conway | 2002-09-26 21:48:40 | Re: dblink |
From | Date | Subject | |
---|---|---|---|
Next Message | Bruce Momjian | 2002-09-26 22:04:52 | Re: [HACKERS] Performance while loading data and indexing |
Previous Message | Bruce Momjian | 2002-09-26 21:47:43 | Re: [HACKERS] Performance while loading data and indexing |
From | Date | Subject | |
---|---|---|---|
Next Message | Bruce Momjian | 2002-09-26 22:04:52 | Re: [HACKERS] Performance while loading data and indexing |
Previous Message | Bruce Momjian | 2002-09-26 21:47:43 | Re: [HACKERS] Performance while loading data and indexing |