On Thursday 02 January 2003 10:44, Michael J. Pawlowsky wrote: >Just wanted to know if someone is using this drive with Amanda. >Do you have TapeType info for it? > >Thanks
Someone probably is, but your quickest way is to run tape-src/tapetype (after you build it with a "make tapetype" in the tape-src directory) However, its not a speed demon either since it has to write the whole tape to find EOT. You can speed things up a bit if you give tapetype an argument thats an estimate of the tapesize though/ Be sure and turn off the drives compression else you get falsely low answers due to tapetypes use of /dev/urandom as a data source while writhng the tape. /dev/urandom is normally not compressable and may in fact grow by 10 or more precent when fed thru a hardware compressor. Generall speaking then, turn off the drives compressor, and leave it off. Be aware that most tapes will have the compression state recorded in their admin header area, and to get those to the uncompressed state requires rewinding the tape, turning off the compression with mt, and then dd'ing enough dummy data to the drive to force a buffer flush in order to get that hidden header updated and the compression turned off for that tape. Besides, amanda can put much more effective compression to use, its no farther away than the choice of dumptype to use in amanda.conf. Here, even with compression turned off for those disklist entries that are mostly archives already, I still get an average compression ratio of about 40% of the original size. Some dirs will smash to less than 10% of the original size. -- Cheers, Gene AMD K6-III@500mhz 320M Athlon1600XP@1400mhz 512M 99.21% setiathome rank, not too shabby for a WV hillbilly
