Earlier this year, my HP DAT tape drive had problems, and I replaced it
with a Compaq/Sony SDT-9000.  Mostly, I am still using the same DDS-3
tapes that I was using, and retired some and added some.  My old records
show that I was getting nearly the full 12GB uncompressed tape length.

Since the tape drive change, I have wondered why I didn't seem to be
getting all the data on some tapes.  Clearly, with Amanda, some days it
just doesn't want to send a full 12GB to tape; but, mostly, I have been
seeing <9GB going to tape, and balance sitting in holdingdisk.

Today, I did this:

    # time sudo -u backup amtapetype -e 12g -f /dev/nst0 -o
    Writing 32 Mbyte   compresseable data:  37 sec
    Writing 32 Mbyte uncompresseable data:  35 sec
    Estimated time to write 2 * 12288 Mbyte: 26880 sec = 7 h 28 min
    wrote 298832 32Kb blocks in 76 files in 10632 seconds (short write)
    wrote 310628 32Kb blocks in 158 files in 10840 seconds (short write)
    define tapetype unknown-tapetype {
        comment "just produced by tapetype prog (hardware compression off)"
        length 9522 mbytes
        filemark 0 kbytes
        speed 908 kps
    }
    
    real    364m39.451s
    user    0m2.724s
    sys     0m28.719s


What is going on here?

How can I get a full 12GB tape length?

What do you think?

-- 
Best Regards,

mds
mds resource
877.596.8237
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Dare to fix things before they break . . .
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Our capacity for understanding is inversely proportional to how much
we think we know.  The more I know, the more I know I don't know . . .
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