Hi folks,
I'm setting up a high availability system, and have a question
on the way that qmail handles disk writes.
I'll be using LVS (linux virtual server) patch to the
linux kernel coupled with heartbeat/ldirector
to do load balancing and high availability on
a farm of computers which will boot off a cd-rom,
and mount their root partition via NFS.
The cluster nodes will all have internal ip addresses,
and the monitoring machines will do ip tunneling to
make these machines appear as one single machine,
serving thousands of domains.
The NFS server will be the where all the user data
is held, on a raid 1+0 disk array with ReiserFS,
apache, qmail, /home, etc... (It will be running
linux 2.2.18 or 2.4.X, kernel nfs server, lots of RAM)
My question is, is it possible to run multiple instances
of qmail, sharing the same disk structure, configuration, etc..
Basically, have each cluster node run qmail and keep
all the data on one server without encountering
inconsistencies in file locking (assuming the latest
version of knfsd does not have any locking issues).
That's plan A. Plan B is setting up a decicated mail
server, which I would like to avoid if necessary,
because it won't scale nearly as well.
Thanks in advance,
Mark Steele
VP research and development
Inet Technologies Inc.
email: [EMAIL PROTECTED]
