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What is the pro's and con's of a single-drive tape library and a dual?

I am in the market to purchase a tape backup library auto-loader and one I have looked at is a Sun StorageTek SL24 with a single LTO3 drive. Seems a great value at under 5K. I am just worried about it being a single drive unit. Should I consider a dual drive? What are the pros and cons? I am not sure what the differences are. Can a dual drive backup twice as fast as a single?
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If I had only 1 job consisting of multiple servers, would it automatically use both drives for that job to backup 2 servers at the same time?
>> If I had only 1 job consisting of multiple servers, would it automatically use both drives for that job to backup 2 servers at the same time?

Depends on what backup software you are using.
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