A few vague comments and additional questions,

You mention that ". . . the 3584 was recommended but then seen as a
likely bottleneck."  In what way could this be seen as a bottleneck?
Appropriately configured, it would have significant capacity in excess
of your 500 GB.  It could attach to both machines and function
independently on either.  I would have thought a 3584 would be almost
the high end for your configuration, unless you need super-speedy
restore of individual objects.

For less than the cost of a 3584 you could get two 3581's with 1,400 GB
of storage at standard 2:1 compression.  Since your customer already has
BRMS and TSM, it is possible that they would have the sophistication and
technical expertise to take full advantage of a full-blown library
device like the 3584.  The price difference between a 3580 (single slot)
and a 3581 (seven slots) is not great enough to consider the 3580.
Something like $5,000+ vs. about $8,000.

What functionality (based on business need) does you customer require
that necessitates a full tape library as opposed to a seven-slot

How price-sensitive is your customer?  Is IBM overselling?

If your customer starts looking at the 3590 models, consider a
fiber-channel interface.  This won't fly on the 720, but it would ensure
that the connection between the machines is not a limiting factor in

I tend towards lowest-cost solutions, unless there is an overriding
business requirement.

Andy Nolen-Parkhouse

> Here goes with a vague question....
> I have a customer with an 820 with just short of 300 gigabytes of disk
> currently being backed up to 3570 B1 using BRMS/TSM combination. They
> have a 720 with a similar amount of disk and tape drive, used as a
> development machine and a standby DR machine. This second machine will
> the future some time probably be upgraded to an 820 and is almost
> to act as a data replication point for the primary production machine.
> These things are just a matter of when not if according to the
> Obviously the disk will grow and 500 gigabyte data quantities are not
> far off as is some kind of near 24/7 operation.
> The customer has been talking to IBM about how to proceed with
> their tape devices and the long and short of it is that there seems to
> some confusion as to what is a good upgrade plan strategy taking into
> account their current configuration. I believe the 3584 was
> but
> then seen as a likely bottleneck.
> Without a lot of thought my suggestion to the customer was to get a
> smallish LTO on the prod box to be used for tape backup and restore in
> immediate future, and down the track for those one-off events and tape
> transfers, and a larger LTO on the dev/back-up box where the major
> work is likely to be conducted when they get their replication in
> What general (or specific) suggestions does anyone have about
> configurations and hardware they use for similar setups and why ?
> got any good thoughts, questions, ideas, things they wouldn't do again
> share ?
> Any response appreciated
> Regards
> Evan Harris

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