Question, maybe someone knows

[Tom_MUC]

Hello,

 

 

 

i have been surfing the WWW for quite a time now, but didn`t find any hints on what i am looking for. So maybe someone in here can help me with my problem :-)

 

 

 

- I have 6 Macintosh G4 Servers (OS 9.2.2) running in complete.

 

- 1 of the 6 is only used as a "Backup-Server" (also OS 9.2.2)

 

- I have a Tandberg DLT8000 (SCSI-UW 40/80DLT) connected to the Backup-Server.

 

- the 5 File-Servers have each RAID1-Servervolumes with the size of 17.5 GB each.

 

- if i count the *real* data on the 5 File-Servers which need to be backuped i see about 52GB of data atm.

 

- I have Retrospect v4.3 running as backup-Software on the Backup-Server.

 

 

 

My problem is:

 

 

 

- Retrospect is running ok, the script is working (it seems at least)

 

- only the backup stops and asks for another DLT-Tape when there`s about 9 GB left to backup.

 

 

 

Since i have a DLT8000 (40 normal / 80 compressed) i wonder why it stops and keeps asking for another tape....

 

 

 

I configured on 1st try a "software-compression" which ended in asking for 2nd tape

 

Then i configured "hardware-compression" on the Tandberg-DLT and it ended up asking for a 2nd tape at nearly the same amount of left data (around 9 GB).

 

 

 

Does anyone have an idea about why that happens?

 

Sure, i could try buying a 100/200-DLT, but this is quite expensive....

 

 

 

I just don`t really get why Retrospect òr the DLT isn`t able to backup around 52 GB of yet uncompressed data. 40/80 means to me it should do it...

 

 

 

It would be very nice if someone could give me a hint on my problem showed above.

 

Thank you very much!

 

 

 

Greetings

 

Tom

 

 

 

 

 

 

[AmyJ]

The following link will provide detailed information on tape capactiy and compression:

 

 

 

http://www.dantz.com/index.php3?SCREEN=common_questions_detail&ACTION=COMMON_QUESTIONS_DETAIL&id=49

 

 

 

Hope this helps!