On Sun, Jul 29, 2007 at 10:38:07AM -0500, Steven Osborn wrote:
> I did give it -e of 200G which is it's native capacity, and it estimated 51 
> hours.  It's capable of 86.4GB/hr so each pass *should* take about 2.5 hours. 
> 
> 
> -----Original Message-----
> From: owner-amanda-users AT amanda DOT org on behalf of Jon LaBadie
> Sent: Sat 7/28/2007 10:07 PM
> To: amanda-users AT amanda DOT org
> Subject: Re: amtypetype taking 51 hours??
>  
> On Sat, Jul 28, 2007 at 07:18:32PM -0500, Steven Osborn wrote:
> > 
> > I have a Dell Powervault 124T LTO-2 and I'm running amtapetype on it and it 
> > is running incredibly slow.  It estimates 51 hours to check the tape.  I'm 
> > new to amanda, but this seems absurdly slow to me.
> 
> I'll bet you did not give amtapetype an estimate of your tapes capacity,
> the -e option.  Without that, it writes many, many very small files
> which cause the drive to stop and restart at each EOF.
> 
> Abort the attempt and restart amtapetype.
> 
> For future reference, check the manufacturer's estimated writing speed
> and calculate how long, at that speed, one complete pass should take.
> amtapetype makes two complete passes during its run.  Thus the total
> time should be 2-4 times what you calculated for 1 pass.
> 


Something seems wrong.  I wouldn't trust any values obtained from
a 24+ hour run.  There is a report after pass 1.  If you don't
get that by about 2x, at most 3x, the calculated figure I'd abort.
Six - eight hours is a common complete runtime.

Check your setup.  Do a dd of about 1GB from /dev/?random? and
see how long that takes.  Extrapolate if it is too slow.  SCSI
setups have been know to have problems once or twice ;-)

-- 
Jon H. LaBadie                  jon AT jgcomp DOT com
 JG Computing
 4455 Province Line Road        (609) 252-0159
 Princeton, NJ  08540-4322      (609) 683-7220 (fax)