Hmmm, but the "real hit ratio" was 68%? 

-----Original Message-----
From: Edward Ned Harvey (opensolarisisdeadlongliveopensolaris)
Sent: Tuesday, September 11, 2012 8:30 AM
To: Dan Swartzendruber;
Subject: RE: [zfs-discuss] Interesting question about L2ARC

> From: [mailto:zfs-discuss- 
>] On Behalf Of Dan Swartzendruber
> My first thought was everything is
> hitting in ARC, but that is clearly not the case, since it WAS 
> gradually filling up the cache device.

When things become colder in the ARC, they expire to the L2ARC (or simply
expire, bypassing the L2ARC).  So it's normal to start filling the L2ARC,
even if you never hit anything in the L2ARC.

> ARC Efficency:
>           Cache Access Total:             12324974
>           Cache Hit Ratio:      87%       10826363       [Defined 
> State

That is a REALLY high hit ratio for ARC.

It sounds to me, you probably have enough ram in there, that nearly
everything is being served from ARC.

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