This is going to have to be done in 2 steps, to upgrade to DP 6.21, or DP 7.x, then, upgrade to 8.1, since there is no direct upgrade path from 6.10 to 8.x
Also, check the Platform Support Matrix for DP 8
http://support.openview.hp.com/selfsolve/document/KM00453104
to be sure that teh platform that you are plannig up upgrading is supported with DP 8