I'm having a similar situation to the other thread by this name.
Our server had a failed RAID drive and replaced it. Since then we had issues with some data files. When we tried to back them up or read them the NSS pool would dismount and we'd have to restart the server. I ran "nss /poolrebuild /purge" yesterday on all the pools and the problem persists.
We're running NW65 and have N65NSS8C installed.

What's our next step? I'm not quite ready to throw in the towel, back up what we can, and rebuild the server. I gotta believe there's SOMEthing else we can do.