You're correct Jean-Louis!!
  I made the mistake of just looking at the  package which advertises 
40native/80compressed on the DLTIV media, not remebering that this the max you 
get for the DLT8000 drives.  Since I only have a DLT4000, my capacity is 20GB 
native/40GB compressed, as you stated.  this makes sense now.  Thanks J-L.
   
  Question for Jean-Louis or anyone else, what is your opinion on using 
software and hardware compression with AMANDA?

Jean-Louis Martineau <martineau AT zmanda DOT com> wrote:
  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
>>
>> ________________________________
>>
>> Be a better sports nut! Let your teams follow you with Yahoo Mobile. Try
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>> >> _qDKvtAbMuh1G1SQtBI7ntAcJ>
>> 
>
>
>
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