Slight brain fart, I didn't even think of hardware compression duh! I guess the only real way to to do it is just experimentation. I still seem to remember a program from long ago, and it may have been a VSE program, that would tell you how many bytes would go to the tape, in fact I think it told you how many feet of tape (2400/3400) would be used..
Thanks guys. On Wed, Mar 30, 2011 at 5:14 PM, Tom Duerbusch <duerbus...@stlouiscity.com>wrote: > If you are doing software compression, then, perhaps use the Pipe DDR stage > and route it to the "count" stage. > But knowing how much compression the hardware will do....not obvious to me. > > However, once you do have a compressed tape, DITTO TMP will tell you how > much tape the compressed dataset took on the media. > > Tom Duerbusch > THD Consulting > > >>> Rich Greenberg <ric...@panix.com> 3/30/2011 4:55 PM >>> > On: Wed, Mar 30, 2011 at 11:37:00AM -0700,Tom Huegel Wrote: > > } That doesn't show the compressed byte count is (would be). The goal here > is > } to be able to predict how many tapes I will need to do backups. > > If you are doing hardware compression in the tape drive, I don't think > there is any way for DDR to know the compressed byte count. Software > compression, yes it would. > > I suspect that the easiest way to determine the tape counts will be > experimentally. > > -- > Rich Greenberg Sarasota, FL, USA richgr atsign panix.com + 1 941 378 > 2097 > Eastern time. N6LRT I speak for myself & my dogs only. VM'er since > CP-67 > Canines: Val, Red, Shasta, Zero & Casey (At the bridge) > Owner:Chinook-L > Canines: Red & Cinnar (Siberians) Retired at the beach Asst > Owner:Sibernet-L >
