On Sun, 27 Dec 2009, Tim Cook wrote:

Cmon, saying "all I did was change code and firmware" isn't a valid comparison 
at all.  Ignoring
that, I'm still referring to multiple streams which create random I/O to the 
backend disk.

I do agree with you that this is a problematic scenario. The issue is with how fast the data arrives. If the data is written quickly, then quite a lot of data will be written in each transaction group and zfs can usefully optimize that transaction group. If the data trickles in, then it is a difficult problem for any general-purpose filesystem to solve.

Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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