Hello Michael, you must install the mtst command in your Linux. After that you can enable the hardwarecompression (as far as I know the dafault is OFF)
# mtst -f /dev/rtibm0 compression 1 This helped in my environment(Suse sles9) kindest regards Mit freundlichen Grüßen, Horst Rempel Berufsgenossenschaft http://www.bgchemie.de <http://www.bgchemie.de/> der chemischen Industrie e-mail [EMAIL PROTECTED] Abteilung EDV/DV-ORG Kurfürstenanlage 62 69115 Heidelberg Tel.: 06221 / 523-1303 Fax : 06221 / 523-227 -----Ursprüngliche Nachricht----- Von: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] Auftrag von Michael Coffin Gesendet: Donnerstag, 6. September 2007 15:14 An: [email protected] Betreff: 3590 (B1A) Hardware Compression We use 3590 B1A drives, with 10/30 carts providing native capacity of 10GB, with up to 30GB using hardware compression. I am under the impression that the hardware will choose the best compression possible UNLESS it is specifically told otherwise (i.e. via a TAPE COMP/NOCOMP and DDR COMP/NOCOMP/LZCOMP options). Is this true, and is there a way to query the hardware from z/VM (4.4) to see if default hardware compression has been enabled on the drives (I imagine it has to be set by the CE during install/configuration)? I have a z/Linux user that was trying to dump 13GB of data and ran out of space, so it looks as though default hardware compression is not working. :( -Mike
