Bas, I am working on an integration technique that solves these problems
and is already showing tremendous promise. It's in production use in a
very high pressure environment but suffice to say it's an integration of
what's out there (I am 100% Linux based so don't expect anything but Linux).
Once it is completed and I feel that I can present it to a wider
audience such as this one, I will formally announce it and seek a peer
review process.
But let's just say that it is possible, RIGHT NOW, to get full
redundancy and failover that works, it OpenSource and runs on cheap
hardware.
Brian A. Seklecki wrote:
Wiley Press, ISBN 0-471-43026-9, Even Marcus & Hal Stern
Whatever you do, don't read this book when planning your
enterprise-class PostgreSQL cluster using Slony1. The author(s) give
a scathing opinion of network based asynchronous database
replication. Especially for redundant configurations within the same
facility. They concede that the method has some applicable uses
(facility to facility replication), but they go so far as to recommend
long distance SAN before software+network.
The entire text has a highly anti-microsoft undercurrent which makes
it a real page-turner, unfortunately, most of the advice regarding HA
application clusters has a commercial-UNIX oriented slant (they all
but endorse VERITAS).
The book only serves to further emphasize that there is no definitive
FMS (Fail over Management Software) solution for Open Source UNIX-like
OSs. No true platform-independent (well, Linux-HA[.org]) project that
integrates with monitoring, databases, web servers, load balancers,
RAID / SAN controller, etc.
The projects are there (PostgreSQL, Slony, PGPool, Nagios, Net-SNMP,
FreeVRRPd, FreeBSD, GNU/Linux, Linux-HA, etc..), there just no
integration yet.
~BAS
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