Wes Felter wrote:
slog and L2ARC on the same SSD

You can do that already today.

Create two slices using format(1M) and add the slices rather than the whole disk as the L2ARC or slog device.

However IMO this is with current SSD techology probably the wrong thing to do. The slog wants a very fast write devices, the L2ARC wants a very fast read device. Unless your SSD is fast at both reads and writes using the same SSD for the slog and L2ARC isn't a good idea.

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Darren J Moffat
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