[CentOS] HA Storage Cookbook?

Hello List,

Can anyone recommend some sites regarding building high-availability storage networks using centos (or the upstream providers brand name)? I need to have approx 2-3 tb of storage available via iscsi and smb, but worry about having it all on a single server. Most of the HA articles I'm reading deal with application high availability, but not storage.

Right now I have a centos 4.6 box serving up a mirrored pair of 1tb drives via iscsi and smb, but the poor machine comes apart when anyone tries to write a lot of data. I'm hopefully to have a little budget to upgrade in Q1 2009. Ideally I'd like to get two boxes with proper hardware raid and have them in a cluster.

Any suggestions are appreciated,

Gordon