> > 4. This error comes up in my daily report (or from iostat -x):
> > 
> > iostat: sysctl hw.diskstats failed: Invalid argument
> 
> Do you have out of sync kernel and userland ?
> 
Excuse my ignorance, but isn't sysctl interface here to keep
compatibility, even if userland and kernel are out of sync? What's the
point of using sysctl if you must keep them in sync? You might as well
grovel kernel memory, no?

Bye Pavel