On Thursday 08 July 2004 08:50, Joshua Baker-LePain wrote: >On Thu, 8 Jul 2004 at 8:35am, Gene Heskett wrote > >> On Thursday 08 July 2004 01:32, Alexey I. Froloff wrote: >> >* Alexey I. Froloff <raorn@> [040707 14:10]: >> >> P.S. Right now I figured how to turn HW compression off (with >> >> mt utility) and started amtapetype again... >> > >> >Thanks to all for your help. amtapetype finished successfully. >> > >> >$ /usr/sbin/amtapetype -e 100g -f /dev/nst0 -t "HP-C7971A" >> >Writing 1024 Mbyte compresseable data: 25 sec >> >Writing 1024 Mbyte uncompresseable data: 72 sec >> >WARNING: Tape drive has hardware compression enabled >> >> Please disable this as it hides the true tapesize from amtapetype >> AND amanda. amanda can do a much better job of filling up a tape >> if amanda knows how much a tape can hold. You can use the >> optional gzip compressor on portions of the system to much better >> advantage in terms of achieved compression ratios, and generally >> can stuff more data onto a tape than using the hardware compressor >> can do. Here, under what would be termed ideal conditions, I've >> had amanda email me and rep[ort that it just put a bit over 12Gb >> on a 4Gb tape that has the last 370megs reserved for something >> else I'm doing here. > >Actually Gene, for this drive disabling hardware compression isn't >necessary. It's an LTO/Ultrium drive, and those are actually smart > enough to not compress already compressed data. Notice (below) how > he still gets the full 100GB native capacity? With those drives, > you get the best of both worlds -- you can mix software and > hardware compression. Very, very slick.
And a bit expen$ive for my retired blood. I've spent $200+ on a fresh pair of drives here since the first of the year, and they are both dead now, acting like worn out heads. So if I ever get this machine stable enough to worry about amanda, I'll see if I can make amanda use dvd+-rw's instead. But right now the video card died yesterday, and an atempt to recomipile kde-3.2.3 is meeting with a bus error in the middle of the qt-x11-free-3.2.3 build. Hello... Bus error? Nothing in the logs, nada, zip zero. >> >Estimated time to write 2 * 102400 Mbyte: 14400 sec = 4 h 0 min >> >wrote 3244032 32Kb blocks in 99 files in 7310 seconds (short >> > write) wrote 3244032 32Kb blocks in 198 files in 7666 seconds >> > (short write) define tapetype HP-C7971A { >> > comment "just produced by tapetype prog (hardware compression >> > on)" length 101376 mbytes >> > filemark 0 kbytes >> > speed 13871 kps >> >} -- Cheers, Gene There are 4 boxes to be used in defense of liberty. Soap, ballot, jury, and ammo. Please use in that order, starting now. -Ed Howdershelt, Author Additions to this message made by Gene Heskett are Copyright 2004, Maurice E. Heskett, all rights reserved.