On 2006-08-02 15:08, McGraw, Robert P. wrote:
./sbin/amtapetype -o -t LTO2HWC -e 200g -f /dev/rmt/1n
Writing 2048 Mbyte compresseable data: 38 sec
Writing 2048 Mbyte uncompresseable data: 76 sec
WARNING: Tape drive has hardware compression enabled
Estimated time to write 2 * 204800 Mbyte: 15200 sec = 4 h 13 min
wrote 6422528 32Kb blocks in 98 files in 7358 seconds (short write)
wrote 6455296 32Kb blocks in 197 files in 7737 seconds (short write)
define tapetype LTO2HWC {
comment "just produced by tapetype prog (hardware compression on)"
length 201216 mbytes
filemark 0 kbytes
speed 27315 kps
}
I am in the process of trying to find out how to turn off hardware
compressing for the Solaris 10 OS.
I hope you did understand that turning off hardware compression for
LTO tape drives is not so important as for most other tape drives.
So why doing the effort, while you can use both hard- and software
compression, and not suffer from the bad side effect (expanding data
and loosing capacity) that most other tape drives have.
As Joshua, I have hardware compression turned ON for my LTO2 drive,
so that a few DLE's on slow hosts, where I cannot afford software
compression, still benefit from the hardware compression and my
tapes can hold more than 100% data now and then.
--
Paul Bijnens, xplanation Technology Services Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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