SIP Implementation

  "With ZFS however the in-between cache is obsolete,
as individual disk
  caches can be used directly."


The statement needs to be qualified.

Storage cache, if protected, works  great to reduce critical
op latency.  ZFS when it   writes to disk cache, will  flush
data   out  before return  to   say  an  O_DSYNC write.  The
application level latency is not improved  by the disk write
cache.  But a battery protected mirrored storage cache
should
act as a latency reductor, thus improving some workloads.


____________________________________________________________
________________________
	Performance, Availability & Architecture Engineering  

Roch Bourbonnais                        Sun Microsystems,
Icnc-Grenoble 
Senior Performance Analyst              180, Avenue De
L'Europe, 38330, 
					Montbonnot Saint Martin, France
Roch.BourbonnaisSun.Com        	http://blogs.su
n.com/roller/page/roch


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