On 08/06/2011 14:35, Marty Scholes wrote:
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.
Yes, in most cases, but I can think of some counter examples ;)
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