Amanda-Users

DAT DDS4 size or avoiding hardware compression on Linux/Debian

2002-11-25 12:30:02
Subject: DAT DDS4 size or avoiding hardware compression on Linux/Debian
From: Ronan KERYELL <Ronan.Keryell AT enst-bretagne DOT fr>
To: amanda-users AT amanda DOT org
Date: 25 Nov 2002 17:56:16 +0100
I'm in trouble with a HP SureStore DAT40 (DDS-4) since I cannot write
compressed partition past 16GB instead of achieving the theoretical 20GB.

I guess it is because the drive is in hardware compression mode, but I do
not know how to explain it to the drive... :-)

I've read the man st and is does not look as clear as on Solaris...

gaudi:~# ls -al /dev/nst0*
crw-rw----    1 root     tape       9, 128 Mar 14  2002 /dev/nst0
crw-rw----    1 root     tape       9, 224 Mar 14  2002 /dev/nst0a
crw-rw----    1 root     tape       9, 160 Mar 14  2002 /dev/nst0l
crw-rw----    1 root     tape       9, 192 Mar 14  2002 /dev/nst0m

I've tried each /dev/nst0* without success :

gaudi:~# tapetype -f /dev/nst0 
wrote 524508 32Kb blocks in 1604 files in 9324 seconds (short write)
wrote 505626 32Kb blocks in 3102 files in 11965 seconds (short write)
define tapetype unknown-tapetype {
    comment "just produced by tapetype program"
    length 17021 mbytes
    filemark 403 kbytes
    speed 1576 kps
}
gaudi:~# tapetype -f /dev/nst0a
tapetype: could not rewind /dev/nst0a: No such device or address
gaudi:~# tapetype -f /dev/nst0l
tapetype: could not rewind /dev/nst0l: No such device or address
gaudi:~# tapetype -f /dev/nst0m
tapetype: could not rewind /dev/nst0m: No such device or address

Hmmm... Strange...

Any help in the audience ? :-)
Thank you,
-- 
    Ronan KERYELL              |\/
    Labo Informatique Télécom  |/)  Tel:    (+33|0) 2.29.00.14.15
    ENST Bretagne, BP832       K    Fax:    (+33|0) 2.29.00.12.82
    29285 PLOUZANE CEDEX       |\   E-mail: Ronan.Keryell AT enst-bretagne DOT 
fr
    FRANCE                     | \  http://www.lit.enstb.org/~keryell

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