On Sat, Oct 3, 2009 at 11:33 AM, Richard Elling <richard.ell...@gmail.com>wrote:
> On Oct 3, 2009, at 10:26 AM, Chris Banal wrote: > > On Fri, Oct 2, 2009 at 10:57 PM, Richard Elling <richard.ell...@gmail.com> >> wrote: >> >> c is the current size the ARC. c will change dynamically, as memory >> pressure >> and demand change. >> >> How is the relative greediness of c determined? Is there a way to make it >> more greedy on systems with lots of free memory? >> > > AFAIK, there is no throttle on the ARC, so c will increase as the I/O > demand > dictates. The L2ARC has a fill throttle because those IOPS can compete > with the other devices on the system. > Other then memory pressure what would cause c to decrease? On a system that does nightly backups which are many times the amount of physical memory and does nothing but nfs. Why would we see c well below zfs_arc_max and plenty of free memory? Thanks, Chris
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