Oh, ok.  So /dev/rdsk is never going to work then.  Mind if I pick your brain a 
little more then while I try to understand this properly.

The man pages for the nvram card state that /dev/rdsk will normally be the 
preferred way to access these devices, since /dev/dsk is cached by the kernel, 
which negates some of the benefits of having nvram based storage.

Is that something I should be concerned about when using one of these as a slog 
device?  Or will ZFS be flushing data from the kernel cache to the disk often 
enough that it's not a problem?
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