On Sat, 22 Nov 2008, Bob Netherton wrote: > >> In other words, for random access across a working set larger (by >> say X%) than the SSD-backed L2 ARC, the cache is useless. This >> should asymptotically approach truth as X grows and experience >> shows that X=200% is where it's about 99% true. >> > Ummm, before we throw around phrases like useless, how about a > little testing ? I like a good academic argument just like the next > guy, but before I dismiss something completely out of hand I'd like > to see some data.
This argument can be proven by basic statistics without need to resort to actual testing. A similar issue applies to non-volatile write caches. Luckily, most data access is not completely random in nature. Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
