I'm looking for a tool (preferably free but ok if not) that can reduce my workload on a new project I'm working on. I've inherited a new network with about 100 servers that was just abandoned by the old IT staff and have absolutely no documentation whatsoever about any of the machines on site.
My current plan is to use the existing Nagios box's config to see what boxes/services are being monitored as well as an NMAP scan of the network and a whole lot of manual logging in to servers to document running services and configs. Basically starting from absolute scratch. As you can imagine, this is going to be heavily labor intensive, and I'm wondering what tools you guys might recommend to automate at least part of the process, perhaps automated device and service discovery with at least a partially clean output?
Also, what are your preferred tools for documenting networks like this other than manually creating Visio documents?
Thanks in advance for your ideas.