zfs discuss - Feb 2009 - zfs cache behaviour.

Hi all,

I''m looking for a document that explain the working of the zfs cache. 
Especially the S10 update6. I need to understand why the utilization of 
the cache is not up to the arc size we set. In respect of the server 
workload, we expect that the datas are spread across the size allowed 
for the cache.

Best regards,
Pascal

-- 


<http://www.sun.com/>

	

*Pascal FORTIN *
Services Account Manager

*Sun Microsystems France*
13 avenue Morane Saulnier
78140 Velizy Villacoublay

Phone x30401 / +33 1 34 03 04 01
Mobile +33 6 85 83 10 01
Email pascal.fortin at sun.com <mailto:pascal.fortin at sun.com>



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Pascal Fortin wrote:
> Hi all,
>
> I''m looking for a document that explain the working of the zfs
cache.
> Especially the S10 update6. I need to understand why the utilization 
> of the cache is not up to the arc size we set. In respect of the 
> server workload, we expect that the datas are spread across the size 
> allowed for the cache.
The ARC size will be automatically adjusted based upon usage.  If you do not
access data, it won''t be in the cache.  Other than the automatic
adjustments
based on resource constraints (ARC will shrink if memory is needed for
applications) it works like most other caches.
 -- richard