A good reference to the various speeds of various types of SCSI.
http://www.ice.mtu.edu/~jamyles/references/speeds.html

A good article on Diagnosing NFS lock hangs
http://www.unix.org.ua/orelly/networking_2ndEd/nfs/ch11_03.htm

ps -o pid,ppid,rss,args -p "$(fuser / 2>/dev/null)"
processes with open files for root fs