What about client compression?? I have a site that runs client
compression with Magstar 3590B drives and I see some them full at 8GB
when they are 10GB native. The tape drive compression is actually
EXPANDING the compressed client data.

Bill Boyer
DSS, Inc.
On Mon, 2002-11-25 at 09:32, Zlatko Krastev wrote:
> Consider following scenario:
> 1. you backup say 40 GB
> 2. next day you backup 40 GB of which 35 GB updated - 35 GB from step 1
> expire.
> 3. perform step 2 for four days.
>
> The result you have 40 + 4x 40 GB = 200 GB written on tape. Tape reached
> the end and becomes "Full". At the same time you had 4x 35 GB = 140 GB
> expired. Thus you tape holds 200 - 140 = 60 GB (30%) real-data. The rest
> is gaps. Reclamation precess (which is hard, close to impossible, to do on
> single drive) can help.
>
> Zlatko Krastev
> IT Consultant
>
>
>
>
>
>
> Sudheer Kumar <sudheer AT COSMOS.DCMDS.CO DOT IN>
> Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> 26.11.2002 14:22
> Please respond to "ADSM: Dist Stor Manager"
>
>
>         To:     ADSM-L AT VM.MARIST DOT EDU
>         cc:
>         Subject:        tape become full in 21 percent.
>
>
> Hi
>
> I am using LTO 3580 tape drive. but my tape capacity is 100/200GB but
> never got more than 31% utilization. When it reaches 25 to 31percent it
> become Full.Can anybody tell me what could be the reason.
>
> Regards
>
> Sudhir