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cache A device used to cache storage pool data. A cache device can-
not be configured as a mirror or raidz group. For more infor-
mation, see the "Cache Devices" section.
I can't remember which alternative online reference I used on Friday (when I first added a cache to a pool) but it was probably one of those that used the c0t0d0s2 style of addressing in its examples. Ignoring that style, the end result was good
