HA cluster

[Peter Ross]

Hi Jordi,

On Wed, 31 Oct 2007, Jordi Prats wrote:

> Currently I have two (redundant) load balancers with LVS,

I checked the Website.. the most of them are on application level so they 
should be available under FreeBSD as well.

E.g. I have a Red Hat szenario with Apache as the loadbalancer and 
clustered tomcat 6.0 behind. A developer has the same setup at a FreebSD-7 
box and tests it there.

> and several NFS,

I believe the Red Had Cluster uses GFS to have concurrent r/w access to 
the SAN?

I try to imagine to use FreeBSD stuff as gmirror, ZFS, iscsi, CARP etc... 
it all does not sum up to something similiar - but it may be my lack of 
imagination only.

NFSv4 is designed to support for replication and migration but I have no 
idea about the FreeBSD implementation status. I just find this old status 
report: 
http://www.freebsd.org/news/status/report-2006-01-2006-03.html#FreeBSD-NFS-Status-Report

"FreeBSD NFSv4 server is pretty stable now and available via anonymous 
ftp. NFSv4.1 features are not a part of it yet and are not likely to 
happen until at least the end of 2006. Contact 
rick at snowhite.cis.uoguelph.ca for details."

The sources for current only contains code for a NFSv4 client.

To be fair I do not know about the Linux implematation either. A document 
last updated in March 
(http://wiki.linux-nfs.org/wiki/index.php/Server_state) predicts this 
implemented in 2.6.19. We have 2.6.23 by now but I cannot find it in the 
kernel changelogs..

> MySQL and PostgreSQL servers using RedHat cluster suite.

As already pointed out there are replication solutions for postgresql and 
MySQL - they should work under FreeBSD in the same way as for Linux.

Regards
Peter