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There's no such thing as a handoff device. It only makes sense to talk about handoff devices in the context of a partition.

For your partition 29025, there are 3 primary nodes and a bunch of handoff nodes. In fact, every other disk in the whole cluster is a handoff node; swift-get-nodes limits itself to displaying 3 handoffs out of courtesy for your scroll buffer. swift-get-nodes -a will show you all the handoffs. (Note that they're ordered; they will be tried in that order, not picked at random.)

Other partitions will have different primary nodes and handoff nodes; each device will be a primary and handoff node for its fair share of partitions, where "fair share" is determined by the device weights.