> > Are some of the reads sequential?  Sequential reads
> don't go to L2ARC.
> 
> That'll be it. I assume the L2ARC is just taking
> metadata. In situations 
> such as mine, I would quite like the option of
> routing sequential read 
> data to the L2ARC also.

The good news is that it is almost a certaintly that actual iSCSI usage will be 
of a (more) random nature than your tests, suggesting higher L2ARC usage in 
real world application.

I'm not sure how zfs makes the distinction between a random and sequential 
read, but the more you think about it, not caching sequential requests makes 
sense.
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