Hello,

We have IBM 3583 LTO2 Tape library. This library hasn't got enough capabilities 
for our daily backups. But we beleive it can handle backup copies for offsite 
media. So, we need to a new backup device. We thought about EMC datadomain and 
IBM Protectier dedup device but they were expensive. We have two option. We 
have to choice one of them.


1.       We can buy a new LTO5 library for primary and offsite backups instead 
of LTO2 library.

2.       We can buy a new simple external disk unit which has enough capacity. 
We can use TSM 6.2/3 deduplication for primary backups. We will use old LTO2 
library for offsite media. Disk unit will have RAID6 disk system.

Which option do you prefer. Why?
Do you use TSM's deduplication? Is there any known problem?

Thanks
Alper

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