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Ram sizing and L2ARC?

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I know having a large L2Arc eats up ram. Does anyone know if there is a rule of thumb on sizing this? Kind of like the 1GB of ram per 1TB of deduplication?
Seems like a good idea to add L2ARC flash drives as I can afford them in front of my 7200 RPM spinning disks, but I don't want to blow out the ARC holding all metadata for the L2ARC.

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