Are you sure about the size of your tape?
DLT4000 is 20GB Native, 40GB compressed.
Since you use software compression, you can only write 20GB to each tape.

Jean-Louis

Martin.Hepworth wrote:

Wayne
So what happens if you change runtapes to 1? Ie use a minimum of 1 tape.

--
Martin Hepworth
Snr Systems Administrator
Solid State Logic
Tel: +44 (0)1865 842300

-----Original Message-----
From: owner-amanda-users AT amanda DOT org [mailto:owner-amanda-users AT amanda 
DOT org]
On Behalf Of Wayne Thorpe
Sent: 21 November 2007 13:18
To: amanda-users AT amanda DOT org
Subject: Wasted Space, capacity under 50% over multiple tapes

Questions: How can I get all 33.9 GB of data on my 40GB tape media?  How
can I get as much data as possible on first tape before moving to second
tape?


Hello,
Summary or problem is as follows,
-OS: Solaris 9
-Version #: AMANDA 2.5.1p2
-TapeInfo: Quantum DLT4000, 40GB Native, 80GB,
-Driver Info: /dev/rmt/0n (no hardware compression)
-Problem: I have 33.9 GB of comressed data spread accoss 14 different
partitions that are scheduled for backup to tape at level 0 weekly. After
software compression, each partition dump size range between 2.3MB and
7.8GB.
The problem is that I getting a lot of wasted space on the tape writes.
Runtapes in amanda.conf = 2.  The first fills up to only 33.4% and then
AMANDA moves job to a second tape filling up to 45.6%.
In previous backups a 'ran out of tape' error appeared after using both
tapes at under 50% and I would be forced to do a amflushed the next
morning to a 3rd tape.


Detail of Settings in amanda.conf:
inparallel 4
dumporder "sSsS"
taperalgo firstfit

 runtapes 2
tpchanger "chg-zd-mtx"
tapedev "/dev/rmt/0n"
tapetype QUANTUM-DLT4000

define tapetype QUANTUM-DLT4000 {
        comment "Quantum DLT4000 (hardware compression disabled)"
        length 39936 mbytes
        filemark        4 kbytes
        speed 1008 kps
}
define dumptype comp-root-tar {
    root-tar
    comment "Root partitions with compression"
    compress client fast
    tape_splitsize  3994 mbytes


Output from Mail Report:
 These dumps were to tapes tapebac07, tapebac08.
The next 2 tapes Amanda expects to use are: 2 new tapes.
The next 2 new tapes already labelled are: tapebac09, tapebac10.


STATISTICS:
                          Total       Full      Incr.
                        --------   --------   --------
Estimate Time (hrs:min)    0:09
Run Time (hrs:min)         8:38
Dump Time (hrs:min)        6:16       6:16       0:00
Output Size (meg)       33944.8    33944.8        0.0
Original Size (meg)     84163.4    84163.4        0.0
Avg Compressed Size (%)    40.3       40.3        --
Filesystems Dumped           14         14          0
Avg Dump Rate (k/s)      1539.6     1539.6        --

Tape Time (hrs:min)        6:44       6:44       0:00
Tape Size (meg)         33945.6    33945.6        0.0
Tape Used (%)              85.0       85.0        0.0
Filesystems Taped            14         14          0

Chunks Taped                 19         19          0
Avg Tp Write Rate (k/s)  1434.7     1434.7        --

USAGE BY TAPE:
  Label           Time      Size      %    Nb    Nc
  tapebac07       3:07    15724M   39.4    11    13
  tapebac08       3:37    18222M   45.6     3     6

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