From: Peter Galbavy (peter.galbavyknowtion.net)
Date: Thu May 01 2003 - 10:39:07 CDT

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Derick Siddoway wrote:
> Right, so you don't just ping the active host, you test the
> application on that host. If you're doing failover on a
> database, for instance, you actually execute some SQL for
> the "aliveness" test. At least, that's how it worked on both
> sun and veritas clusters.

Yep, and then you find that the 'failure' is actually either between the
primary and secondary boxes, and the secondary goes live without the primary
really being down, or the secondary being isolated for a short time
completeley, bringing itself into service and then when it is reattached to
the world, it kills the primary.

This can get very very recursive...

Peter

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]