Re: hardware commpression in ntbackup 2000 server

From: Bjorn Landemoo (mvp2.REMOVE_at_landemoo.com)
Date: 09/21/04 

Date: Tue, 21 Sep 2004 21:33:04 +0200

Pawel

I don't know if you missed my earlier answer, but here it is again:

This is not a general problem with NT Backup in Win2000, as it usually
works. There isn't anything in MSKB about this issue, either.

It might be a hardware/firmware problem, have you checked with your
hardware vendor?

I suppose that you are backing up compressible files. If they already are
compressed, hardware compression will not be able to compress them further.
Normally, you get a compression factor 1.2 to 1.4, meaning 24 to 28 GB on a
tape. 40GB is only sales talk. This wouldn't disable the compression state
in NT Backup, though.

Best regards

Bjorn 

-- 
Bjorn Landemoo - mvp2@landemoo.com - http://landemoo.com/
Microsoft MVP (Windows Server - File System)
"sztefek" <sztefek@hotmail.com> wrote:
>Yes hardware commpression is activated.
>I checked compresion status by software.
>When compresion is enabled and ntbackup is set compresion status changed to
>disabled. I can write no more than 20GB (not 40GB) on one DDS4 tape.
>
>This problem doesn't exist in ntbackup in windows 2003 server. Testing
>software always shows enable compresion status.
>
>Thanks
>Pawel
>
>Uzytkownik "Bjorn Landemoo" <mvp2.REMOVE@landemoo.com> napisal w wiadomosci
>news:q8ojk0hvai9jfdmlgnkqgh822qdkb9gtah@4ax.com...
>> Pawel
>>
>> Is hardware compression activated on your tape drive? Usually, there is a
>> jumper or mini-switch to enable compression.
>>
>> The option in NT Backup will only work if your hardware does the
>> compression, as there is no software compression in the product.
>>
>> Best regards
>>
>> Bjorn
>> --
>> Bjorn Landemoo - mvp2@landemoo.com - http://landemoo.com/
>> Microsoft MVP (Windows Server - File System)
>>
>> "sztefek" <sztefek@hotmail.com> wrote:
>>
>> >Why NTbackup switches off hardware compression on DDS4 tape drive? I use
>> >windows 2000 serwer.
>> >How to enable hardware compression when ntbackup works?
>> >
>> >Thanks for help
>> >
>> >Pawel
>> >
>>
>

Relevant Pages

  • Re: Error in NTBackup when backing up large drives to compressed folder
    ... >> We are using NTBackup to create backups of user and server hard drives ... >> To optimize the space on the backup hard drive, ... > no built in compression in NTBackup. ...
    (microsoft.public.win2000.file_system)
  • Re: SBS Backup fails
    ... It is an ntbackup issue, the compression works fine with third party back-up ... I have AIT drives in several SBS systems and this is an issue only with the ... The command we are using in the backup preparation script now for the ...
    (microsoft.public.windows.server.sbs)
  • Re: Backup to two tape drives
    ... Compression is a function of the hardware, ... NTbackup uses Volume Shadow Copy service (VSS in this case, ... Les Connor [SBS MVP] ... > I actually got a backup last night...with a verify. ...
    (microsoft.public.windows.server.sbs)
  • Re: NTBackup Problems
    ... > I am having a few issues with a Travan 40 Tape Unit and NTBackup on a ... > compression or should I be able to backup 40GB with NTBackup with Hardware ...
    (microsoft.public.windows.server.general)
  • Re: Server 2003 - NTBackup not compressing files to tape
    ... Backing up to DDS tape. ... NTBackup is told to use compression if possible. ... that your backup drive does NOT offer hardware compression. ...
    (microsoft.public.windows.server.general)