Kindly have a look at http://jazz.external.hp.com/papers/TSWhitePaper.html Regards, Bijo "Bill Green" <[log in to unmask]> wrote in message news:v5b482phvga008@corp.supernews.com... > There is a problem with high performance DLT operation, software compression > and system performance. > > > > When replacing a DDS3 with a DLT7000 FWD tape drive we should see a > performance increase of at least 4 times the performance. If everything is > configured for performance you should get roughly 7.2Gb of storage with > compression on a DDS3 drive and roughly 35Gb with hardware compression. > When software compression is thrown in the equation there are different > results depending on the performance of the system. The reason seems to be > due to the CPU having to compress the data and pass it on to the DLT Drive. > The DLT is a streaming device and would prefer the data to continue without > stopping. Simply the DLT is having to stop and sometimes reverse to start > again. Using my technical term "wish/wash". I have used the maxtapebuf 32K > option with little to no help as the DLT7000 is backing up much faster than > a lousy 16KB increase. > > > > I have seen this occur on a number of smaller systems. Once you get into a > multiple processor system of any kind or really anything faster than 987/988 > the problem goes away. Of course the other way is stop using the software > compression software. > > > > Does anyone have any ideas in this regard.. > > > > Regards, > > > > Bill Green > > * To join/leave the list, search archives, change list settings, * * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *