On Wed, Jun 08, 2011 at 11:44:16AM -0700, Marty Scholes wrote: > And I looked in the source. My C is a little rusty, yet it appears > that prefetch items are not stored in L2ARC by default. Prefetches > will satisfy a good portion of sequential reads but won't go to > L2ARC.
Won't go to L2ARC while they're still speculative reads, maybe. Once they're actually used by the app to satisfy a good portion of the actual reads, they'll have hits stats and will. I suspect the problem is the threshold for l2arc writes. Sequential reads can be much faster than this rate, meaning it can take a lot of effort/time to fill. You could test by doing slow sequential reads, and see if the l2arc fills any more for the same reads spread over a longer time. -- Dan.
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