hardware commpression in ntbackup 2000 server

[sztefek]

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

 

[Bjorn Landemoo]

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

 

[sztefek]

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

 

[Bjorn Landemoo]

Pawel

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

 

[sztefek]

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

 

[Bjorn Landemoo]

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

 

[Guest]

I too am having this same problem. I have found that Microsoft has verified
that this is a problem in Aticle ID 827475:
http://support.microsoft.com/default.aspx?scid=kb;en-us;827475. It say's
there is a hotfix for it but I have no idea how to obtain it.

 

[Bob I]

Quoted directly from the article referenced

"To resolve this problem, contact Microsoft Product Support Services to
obtain the hotfix. For a complete list of Microsoft Product Support
Services phone numbers and information about support costs, visit the
following Microsoft Web site:
http://support.microsoft.com/default.aspx?scid=fh;[LN];CNTACTMS
Note In special cases, charges that are ordinarily incurred for support
calls may be canceled if a Microsoft Support Professional determines
that a specific update will resolve your problem. The usual support
costs will apply to additional support questions and issues that do not
qualify for the specific update in question."