#!/bin/ksh
for x in `cat testdata.dat|awk '{print $2}'|sort -u`
do
        grep $x testdata.dat >$x.out
done       



Where testdata.dat contains your input file with:
server1 nyho
server2 nyho
server3 nyho
server4 risc
server5 risc
server6 mlb
server7 mlb
server8 mlb
server9 mlb