Gluster users - Mar 2011 - Req details for "config as like striping with fail over" for many servers

Hi,

I would like to implement glusterfs 3.1 in my concern.We have around 10 servers
and all are holding diff applications such as
webserver(apache,Tomcat),vmware,DNS server....all the servers are having Diff
disk capacity such as 1 TB,2 TB like that.All the systems are having Ubuntu
10.04

My Requirement: 

1.Need to connect all the servers through glusterfs 3.1.x
2.If i configured as Replication method, i am not getting Disk space.So i need
to configure as like striping method.but glusterfs doesn't provide, fail
over
for this.
3.for e.x if i take
server1:/data(120GB),server2:/data(120GB),server3:/home/g1=2TB,server4:/home/g2=2TB......i
want to connect all the servers.so that i can get big storage space for all.if i
go for striping or distributed, if one server fails, i can't access the
volume
and get an error as "Transport end point not connected"

Please let me know the solution and idea for config for this.i am searching in
google for the past 10 days but no proper result.

Regards,
Varadharajan.S