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jonomite

Is there a way to control which disks in a pool are to be used for duplication?

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I have a large external hard drive that I'd like to use purely for duplicating certain folders from my DrivePool. Is there a way to control this? Ideally, since it's external, I'd like to be able to remove the drive when it's not needed (e.g., when I'm not copying files to the pool). 

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You could use Hierarchical Pools. Say you have disks A, B internal and C is the external one. You can then:
1. Create a Pool Q consisting of A and B, no duplication
2. Create a Pool R consisting of C, no duplication (*)
3. Create a Pool P consisting of Pools Q and R, x2 duplication.

However, I don't think there is a good way to deal with temporarily removing drives. AFAIK, if you then (physically) remove/disconnect drive C, DP will put Pool P in read-only mode. May be what you are looking for but I'm not sure that will always work out well. Moreover, is that a USB connected drive? AFAIK, using USB-connected drives is not considered best practice and IIRC, it has led to problems, including data loss, due to connections over USB sometimes dropping for a bit (which I think is still within spec for USB).

(*) you could also create Pool P with Q and C, so without the intermediary step of Pool R but I think it makes it a bit harder to manage when removing/adding.replacing drives.

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