Other's experience will differ but I detested the 3570.  Had lots of 

In the 3580 and the 3590 world what particular model you are on makes a 
world of difference.  (Providing your CPU even has enough horsepower to 
drive them at their rated speed.)
Traditionally the 3580 holds a LOT more data per tape.  But the 3590's 
were faster.  The newer 3580's blow the doors off of the older 3590's 
speedwise.  The latest 3590 is only a small fraction faster than the 
latest 3580.  However the 3580 still holds a LOT more data per tape.

We ordered four of the latest 3580's this week.  We will be getting rid of 
two 3590's.  The extra's were because some of the tapes had to run at 
different times of the night and our window of opportunity has been 
eliminated and thus the two saves will need to run parallel.  The older 
3580's will move to some of our other machines/partitions.

Nothing's perfect.  Just had a 3580 this week that had a tape stuck and 
required a swap out.  And this morning I heard from a former coworker that 
had the same situation at his location.  First service call he's placed in 
3 years, (couldn't remember IBM's phone number or his customer number, 
while mines permanently etched into my memory that I fear that it will be 
the last thing I forget as I sit drooling in the 'home').  Poor fellow got 
his replacement - it had a tape stuck in it from another location.  One of 
our divisions screwed up and tried to send rejected parts back to the 
customer and now we have several plants closed and we lost a major 
outsourcing customer.  Let IBM do it and we take it on the chin.  I 
suppose that makes me the better man, eh?

Rob Berendt
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755

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