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Re: DDS-3 tapetype ???
2005-06-20 16:58:55
As an FYI here's what I got with my DAT7000 (Quantum) drives....
~# mtx load 28 1 ; sleep 160 ; mt -f /dev/nst1 datcompression 2 ;
amtapetype -f /dev/nst1 -t DAT7000_Compressed -e 70G ; mt -f /dev/nst1
rewind ; mt -f /dev/nst1 datcompression 0 ; amtapetype -f /dev/nst1 -t
DAT7000_UnCompressed -e 35G ; mt -f /dev/nst1 offline ; mtx unload 28 1
Compression on.
Compression capable.
Decompression capable.
Writing 256 Mbyte compresseable data: 27 sec
Writing 256 Mbyte uncompresseable data: 60 sec
WARNING: Tape drive has hardware compression enabled
Estimated time to write 2 * 71680 Mbyte: 33600 sec = 9 h 20 min
wrote 940417 32Kb blocks in 41 files in 7065 seconds (short write)
wrote 951844 32Kb blocks in 83 files in 7178 seconds (short write)
define tapetype DAT7000_Compressed {
comment "just produced by tapetype prog (hardware compression on)"
length 29566 mbytes
filemark 0 kbytes
speed 4251 kps
}
Compression off.
Compression capable.
Decompression capable.
Writing 128 Mbyte compresseable data: 28 sec
Writing 128 Mbyte uncompresseable data: 28 sec
Estimated time to write 2 * 35840 Mbyte: 15680 sec = 4 h 21 min
wrote 1066524 32Kb blocks in 93 files in 7193 seconds (short write)
wrote 1072258 32Kb blocks in 187 files in 7412 seconds (short write)
define tapetype DAT7000_UnCompressed {
comment "just produced by tapetype prog (hardware compression off)"
length 33418 mbytes
filemark 0 kbytes
speed 4687 kps
}
Unloading Data Transfer Element into Storage Element 28...done
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