New ZFSv28 patchset for 8-STABLE
Bob Friesenhahn
bfriesen at simple.dallas.tx.us
Mon Jan 10 18:18:34 UTC 2011
On Mon, 10 Jan 2011, Attila Nagy wrote:
>
> Having this choice is good, and in this case enabling this makes sense for
> me. I don't know any reasons about why you wouldn't use all of your L2ARC
> space (apart from sparing the quickly wearing out flash space and move disk
> heads instead), but I'm sure Brendan made this choice with a good reason.
> If you get an answer, please tell us. :)
Consider that your L2ARC device might be bandwidth limited to
100-240MB/second while your main storage is capable of 1000MB or
2000MB second sequential data transfer. This a good reason to not
simply put all data (which does not fit in normal ARC) into L2ARC.
ARC is supposed to be adaptive ...
Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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