On 10/18/06, adrian cockcroft <[EMAIL PROTECTED]> wrote:
In Solaris 10, iowait is no longer measured and will be reported as zero by existing tools. Since iowait was always a variant of idle time, this makes no difference to usr or sys time. iowait was always a confusing and useless metric, which is why it was removed.
On a related note, I have yet to see vmstat's "b" (kernel threads blocked on I/O) column be non-zero. This includes a large RAC environment where the previous measure of I/O health was (don't shoot the messenger!) iowait. The same workload on S9 consistently showed non-zero values in the "b" column. Has the meaning of this value changed as well, or is Solaris 10 just that much better at getting I/O out of the queue? TIA, Mike -- Mike Gerdts http://mgerdts.blogspot.com/ _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
