RE: Any Experience with Data Transfer Rates to a 3590-H11

True, kind of, I think.  We had a similar experience when we upgraded our
3590-B11's to 3590-*E*11's on our 9406/740 boat anchor this summer.
Eventually our BP produced an internal IBM document showing the performance
of these tape drive models across various AS/400 controllers.  It showed
that B11 and E11 performance would be similar on our SPD technology
controllers.  The full advertised performance of the newer models requires
fibre connectivity on the newer iSeries models.

The bottleneck is connectivity, and you can't upgrade to better connectivity
on your obsolete equipment.

-Jim

-----Original Message-----
From: bdietz@3x.com [mailto:bdietz@3x.com]
Sent: Sunday, January 12, 2003 7:18 PM
To: Midrange Systems Technical Discussion
Subject: Re: Any Experience with Data Transfer Rates to a 3590-H11


I believe that you can get those transfer rates but they involve 8xx
hardware.  It has to do with the bus speed.


-------------------------
 Bryan Dietz
3X Corporation
614-410-9205





Last week, we upgraded our 3590-B11 to the new H11.

We are getting the benefit of up to 180gig per 'K' Tape with 3:1
compression, but we have not gained any data transfer rate speed.

The IBM annoucement said the H11 was 50% faster than the B11.


ie:  raw transfer rate of 14mb/sec for the H11 vs 9mb/sec for the B11

The annoucement also states "up to 43mb/sec with 3:1 Compression.

On controlled tests, we are getting just around 10mb/sec data transfer.
This is on a 9406/740.

What is everyone else seeing ?