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.

35 hours is easily possible if the spool our source disks are heavily
loaded - Just another variable to consider.

Even without a spool disk - if the source disk is slow enough that the
LTO2 drive starts shoeshining, backup times will at least triple.

AB

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