How to read NSD

How do we read NSD in case of crash and server hang (nsd -detach)

Subject: download this

http://www-01.ibm.com/support/docview.wss?uid=swg24019151

that’ll help

Subject: Re: LND - How with LND ?

I have used it in the past but could not understand what to look for in the result provided by LND.

What are the different things we search within a nsd and how to determine the cause of crash or hang.