Re: Losing data from Postgres

* Hossein S. Zadeh <hossein@hossein.bf.rmit.edu.au> [001115 22:26] wrote:
> On Wed, 15 Nov 2000, Alfred Perlstein wrote:
>
> > * Serge Canizares <serge@ephilosopher.com> [001115 08:23] wrote:
> > >
> > > Of course, if someone sees a reason that RAID 5 would be better than RAID 1+0,
> > > I'd appreciate an explanation!
> >
> > Cost. :)
> >
>
> A little bit more explanation: :-)
>
> RAID 1+0 gives you only half of the installed space but gives you (n/2)
> times speed of individual disks. For example for 4 hard disks 1G each, you
> get only 2G of space but double the speed of individual disks.

The problem with mirroring is potentially saturating the bus much
earlier than RAID 5 because of doubling of writes that much occur.

--
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
"I have the heart of a child; I keep it in a jar on my desk."