Re: Virtual Network Interface

1) High availability TomCat, you can run more than one Tomcat service for
your application, which in fact can be running on your secondary server all
the time. You do not have to change/mess-around with IP addresses.
Additional benifit is that it will also do loadbalancing. Please see
http://www.javaworld.com/javaworld/jw-12-2004/jw-1220-tomcat.html and the
normal tomcat documentation on how to set this up.

2) for a Generic file server, you not only have to move the IP, you need
some sort of data/file replication to move this to the other server. There
are multiple technologies you can use, such as Microsoft Cluster,
NSI-DoubleTake, EMC (legato) AAM, as well as DFS and FRS (microsoft R2
versions)

In regards to your backup and monitoring solution, I am not an expert in
these packages on how to configure them in such a way that there are no
issues

HTH,
_Edwin.


"Frank Niedermann" <FrankNiedermann@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:04B2976A-D3C3-4E52-BC3C-69CC5872E43B@xxxxxxxxxxxxxxxx
"Edwin vMierlo" wrote:
not sure if this is actually possible, other than adding an additional
IP

May I ask why you want to do this ?
(maybe we can think of another solution for your problem)

Sure! I have two servers, one is running a service (Tomcat Application
Manager) and the other is a generic file server. Tomcat is installed on
both
servers and if the main Tomcat server goes down for any reason I will
start
the Tomcat service on the 2nd server and migrate the IP address. What I am
doing is to create a standby-server for the Tomcat service.

That works fine with the normal network interface but unfortunately
generates issues with our backup (HP Data Protector) and hardware
monitoring
(HP ISEE agents for ProLiant) applications if the IP address migrates from
one server to another.

We also thought about adjusting a DNS CNAME without IP migration but that
won't work that good because IE clients will cache the IP and therefore
will
get errors.




.

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