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1. Hardware Compression (score: 1): Author: Ralf Auer <Ralf.Auer AT physik.uni-erlangen DOT de>; Date: Tue, 14 Aug 2007 04:18:51 +0200; Hello everybody, if you don't mind, I have two questions concerning hardware compression. I have two HP Ultrium 960 drives. Up to now I used them with hardware compression disabled and compressed my; /usr/local/webapp/mharc-adsm.org/html/Amanda-Users/2007-08/msg00119.html (12,444 bytes)
2. Re: Hardware Compression (score: 1): Author: Jon LaBadie <jon AT jgcomp DOT com>; Date: Mon, 13 Aug 2007 23:52:01 -0400; LTO is unusual. When hwc is enabled each input block is compared with and without compression. The smaller of the two is recorded. As amtapetype feeds "random" data, data that is not compressible, th; /usr/local/webapp/mharc-adsm.org/html/Amanda-Users/2007-08/msg00121.html (14,041 bytes)
3. Re: Hardware Compression (score: 1): Author: Ralf Auer <Ralf.Auer AT physik.uni-erlangen DOT de>; Date: Tue, 14 Aug 2007 06:19:49 +0200; Hi Jon, Ah, I see. So I don't have to worry about that anymore. Good. Sure, I will have to find a "good" value for the scaling factor within the first test runs. I was just confused because of the ex; /usr/local/webapp/mharc-adsm.org/html/Amanda-Users/2007-08/msg00123.html (12,514 bytes)
4. Re: Hardware Compression (score: 1): Author: Paul Bijnens <Paul.Bijnens AT xplanation DOT com>; Date: Tue, 14 Aug 2007 09:13:39 +0200; if you don't mind, I have two questions concerning hardware compression. I have two HP Ultrium 960 drives. Up to now I used them with hardware compression disabled and compressed my data on the clien; /usr/local/webapp/mharc-adsm.org/html/Amanda-Users/2007-08/msg00124.html (14,087 bytes)
5. Re: Hardware Compression (score: 1): Author: Ralf Auer <Ralf.Auer AT physik.uni-erlangen DOT de>; Date: Tue, 14 Aug 2007 10:10:25 +0200; Hi Paul, thanks for your reply. All I can say at the moment is that the Ultrium drive that was used for the 'amtapetype' is attached "only" to a 160Mb/s SCSI-controller at the moment. The official HP; /usr/local/webapp/mharc-adsm.org/html/Amanda-Users/2007-08/msg00125.html (14,480 bytes)
6. Re: Hardware Compression (score: 1): Author: Ralf Auer <Ralf.Auer AT physik.uni-erlangen DOT de>; Date: Wed, 15 Aug 2007 19:07:04 +0200; Hi Paul, here are the two different typedefs, one for the 160Mb/s and one for the 320Mb/s SCSI-controller. In both cases HWC was enabled. This is the output, I used the very same tape for both runs:; /usr/local/webapp/mharc-adsm.org/html/Amanda-Users/2007-08/msg00132.html (15,141 bytes)
7. Hardware Compression (score: 1): Author: "Bob Zahn" <bzahn AT zeus.okccc DOT edu>; Date: Mon, 4 Aug 2003 10:28:29 -0500; I have a couple of Seagate Ultrium 100/200GB tape drives in a Sun/Quantum ATL L25 tape library. When I try to run hardware compression (/dev/rmt/0hbn) on them I still can only fit 100GB of data accor; /usr/local/webapp/mharc-adsm.org/html/Amanda-Users/2003-08/msg00050.html (11,022 bytes)
8. Re: Hardware Compression (score: 1): Author: Jay Lessert <jayl AT accelerant DOT net>; Date: Mon, 4 Aug 2003 09:48:26 -0700; Bob, amtapetype feeds uncompressible data so that you get an accurate picture of what your tape drive will do when presented with default Amanda output (default is 'compress client fast'). The 105GB; /usr/local/webapp/mharc-adsm.org/html/Amanda-Users/2003-08/msg00053.html (13,223 bytes)
9. Re: Hardware Compression (score: 1): Author: Gene Heskett <gene.heskett AT verizon DOT net>; Date: Mon, 4 Aug 2003 17:22:16 -0400; Because its not a 200Gb drive? Because its not, I've been told its a 100 Gb drive. And if you have amanda compress, and then feed that to the drives compressor, the data will often grow somewhat. As; /usr/local/webapp/mharc-adsm.org/html/Amanda-Users/2003-08/msg00066.html (12,510 bytes)

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