[[Veritas-bu] How can 160-180 GBytes fit onto a 80 GByte DLT tape]
2002-04-05 12:02:28
Subject: |
[[Veritas-bu] How can 160-180 GBytes fit onto a 80 GByte DLT tape] |
From: |
kk_downings AT yahoo DOT com (kk downing) |
Date: |
Fri, 5 Apr 2002 09:02:28 -0800 (PST) |
Are you referring to sparse files? Sparse files
usually cause this.
--- jago <javier.graf AT usa DOT net> wrote:
> 10 to 1 that you are backing up databases!
>
> When you backup certain db's the compression factor
> could be 1/4 because of
> the free space you have inside the "assigned" db
> file.
>
> Sincerely yours
>
> T4B Group AG
>
> Javier González
> GM IT Services
> <mailto:jg AT t4b DOT ch>
> www.t4b.ch
>
>
>
> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On
> Behalf Of
> justin AT brighton.ac DOT uk
> Sent: Freitag, 5. April 2002 15:14
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] How can 160-180 GBytes fit
> onto a 80 GByte DLT
> tape
>
>
> Thanks for all your replies concerning duplicating
> images spanning over a
> couple of tapes (Subject: Duplicated faulty tape).
>
> Something else is confusing me! NetBackup reports
> we're fitting around
> 160-180 GBytes on each DLT tape! Surely not? The
> quoted capacity of a
> DLT IV in a DLT 8000 drive is 80 GBytes (assuming a
> 2:1 compression
> ratio). Does anyone have a logical explanation or
> is the compression
> really that good? :)
>
> ID type type # slot face
> level KBytes
>
-------------------------------------------------------------------------
> ---
> BK0014 DLT NONE - - - 5
> 192122560
> FULL
>
> Many thanks, Justin
> --
> \ Justin
> / Network Services, University of Brighton
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