Apples vs. oranges, you ought to know.
Better do not put 9940B in this basket. LTO is upper mid-class drive,
while 9x40 are high-end drives. You can compare them with the newly
announced IBM 3592 drives for 3494. Searchng through list archives you can
find alot of discussions making the same point.
Mid-class: ADIC i2000, HPaq ESL9322, IBM 3584, StorageTek L700e/LTO-2
High-end: IBM 3494/3592, StorageTek L700e/9940B

So the compare should be in two phases:
- consider cheaper mid-class LTO-2 vs. heavy-duty high-end 3592/9940B. You
may take Richard's suggestion (3592/9940B for primary; LTO-2 for copy
pools) into consideration.
- select within the range the vendor best suitable for you

Zlatko Krastev
IT Consultant






Neil Schofield <neil.schofield AT YORKSHIREWATER.CO DOT UK>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
30.09.2003 15:09
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        Tape Technology Comparison


Hello

Anybody out there able to share their thoughts and experiences?

We're doing a technology refresh on some of our libraries and have a
number
of products in the frame:
IBM 3584 / LTO-2
ADIC Scalar i2000 / LTO-2
HP ESL9322 / LTO-2
StorageTek L700e / T9940B

The interesting one from my point of view is the L700e with its T9940B
drives. The performance/capacity comparisons between LTO-2 and T9940B seem
close enough to make no difference which leaves cost and reliability as
the
differentiators.

Reliability will be an important factor in our decision and the T9940B
seems to be marketed as a high duty cycle, 24 x 7 drive. Does anybody have
any real world experieces in a TSM environment which suggest the T9940B is
more (or less) reliable than LTO-2? Should I be concerned about going for
a
'proprietary' technology like 9x40 instead of an 'open' standard like LTO?

Also, any thoughts on the libraries we are considering would be gratefully
appreciated.

For info, no suppliers offered 3590 or 3592. This was probably on grounds
of cost but I'm guessing the first is looking obsolete now while the
second
is a bit too new. Also, we're upgrading from DLT7000 libraries so chances
are we'll be ecstatic with whatever we get.

Thanks
Neil Schofield
Yorkshire Water Services



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