> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Jim Klimov
> Got me wondering: how many reads of a block from spinning rust
> suffice for it to ultimately get into L2ARC? Just one so it
> gets into a recent-read list of the ARC and then expires into
> L2ARC when ARC RAM is more needed for something else, 

Correct, but not always sufficient.  I forget the name of the parameter, but 
there's some rate limiting thing that limits how fast you can fill the L2ARC.  
This means sometimes, things will expire from ARC, and simply get discarded.

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