On Mon, 2 Jun 2008, John Drescher wrote:

> On Mon, Jun 2, 2008 at 8:42 AM, Alan Brown <ajb2 AT mssl.ucl.ac DOT uk> wrote:
> > On Mon, 2 Jun 2008, John Drescher wrote:
> >
> >> On Mon, Jun 2, 2008 at 4:06 AM, Tobias Bartel <tbartel AT eteleon DOT de> 
> >> wrote:
> >> > Hello List,
> >> >
> >> > i have quick question about backups to LTO2 tapes and speeds there of.
> >> >
> >> > Last Saturday I did a test job, about 800GB directly to a LTO2 tape but 
> >> > after
> >> > 35h i had to cancel the job. Is it normal for such a job to take that 
> >> > long and
> >>
> >> This is not normal. 800 GB should be finished in less than 10 hours.
> >
> > You are assuming spooling direct to tape and a fast array.
> >
> > I would expect 20-22 hours for 800Gb to LTO2 via a spool disk.
> >
> On my network I write an LTO2 tape in less than 4 hours so I was
> assuming the job would take 2.5 tapes at max.

LTO2 = 200Gb, not 400Gb

On large backups our experience is a 1.2-1.5:1 compression ratio.

I'd expect to use 3-4 tapes and up to 16 hours at best case.

AB


-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
Bacula-users mailing list
Bacula-users AT lists.sourceforge DOT net
https://lists.sourceforge.net/lists/listinfo/bacula-users