"With ZFS however the in-between cache is obsolete, as individual disk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
[EMAIL PROTECTED] http://blogs.sun.com/roller/page/roch
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