Adam Lindsay wrote:
Okay, the way you say it, it sounds like a good thing. I misunderstood the performance ramifications of COW and ZFS's opportunistic write locations, and came up with much more pessimistic guess that it would approach random writes. As it is, I have upper (number of data spindles) and lower (number of disk sets) bounds to deal with. I suppose the available caching memory is what controls the resilience to the demands of random reads?
W/ that many drives (16), if you hit in RAM the reads are not really
random :-), or they span only a tiny fraction of the available disk
space.

Are you reading and writing the same file at the same time?  Your cache
hit rate will be much better then....

- Bart


--
Bart Smaalders                  Solaris Kernel Performance
[EMAIL PROTECTED]               http://blogs.sun.com/barts
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