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Conference ssag::ask_ssag

Title:Ask the Storage Architecture Group
Notice:Check out our web page at http://www-starch.shr.dec.com
Moderator:SSAG::TERZAN
Created:Wed Oct 15 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6756
Total number of notes:25276

6729.0. "TLZ07, Win95 and Compression" by WOTVAX::16.195.80.64::WorkBenchUser () Thu May 29 1997 03:26

We have a TLZ07-DA rev A01 connected to a Pentium via a Adaptec 
2940. We are using ArcSolo for Windows 95 which lists the TLZ07 
as a supported tape drive.

When compression is enabled either via software or via the 
switch on the tape drive the throughput and the capacity on the 
tape does not really change.

We are using 90mm Digital tapes and only get approx 1.9-2.0Gb 
of storage on the tapes, with or without compression. Also the 
throughput is only approx 23Mb/Min.

Any ideas on why the low capacity and lack of compression ?
T.RTitleUserPersonal
Name		DateLines
6729.1SUBSYS::VIDIOT::PATENAUDEAsk your boss for ARRAY's...Thu May 29 1997 15:5513
    
    
    as always with compression, it depends on your data.
    
    if you compress ASCII you get high ratio's
    
    if you compress executables you get low ratio's
    
    if you compress .jpeg or binary files you sometimes get negative
    results as the files are already at max compression and you waste time
    trying to compress what is already compressed...
    
    roger