Re: High-availability question

Ralf Baechle (ralf@uni-koblenz.de)
Sat, 24 Jul 1999 12:05:36 +0200

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On Sat, Jul 24, 1999 at 12:03:49AM +0200, Rik van Riel wrote:
>
> On Fri, 23 Jul 1999, Marc Mutz wrote:
> > Rik van Riel wrote:
>
> > > Then the only option would be automagic file mirroring
> > > between machines -- in realtime.
> >
> > Couldn't you use raid1 over exported/imported dev files for that?
>
> No. Then you'd have a single machine handle the filesystem
> and I don't want no single point of failure.

You're searching for the silver bullet which doesn't exist. I know of
some Omirr like ha-system in a German bank. A pair of machines for
reasons of availability even distributed over a city each had mirrored
disks, running OpenVMS. The data corruption caused by a not correctly
plugged in SCSI cable resulted in both mirror sets being corrupted and
the corrupted data also being mirrored over to the other system.

Knock out.

Ralf

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