I've been using DTrace more and more to investigate storage performance issues
and keep bumping into something I can't properly explain. The following
snipped comes from Brenden's 'iotop':
...
102 13171 11536 pickup sd6 31 384 R 2364416
80 14597 10632 httpd sd5 31 320 R 2763776
100 5089 4977 mysqld sd5 31 320 W 4349952
0 0 0 sched sd5 31 320 W 5414912
0 0 0 sched sd3 31 192 R 8247296
0 0 0 sched sd4 31 256 R 11098112
This is on a snv_67 system with several active zones. I've been ignoring the
'sched' IO but I'd like to understand it. Can someone clue me in on why I see
so much IO that appears to actually be touching disk?
Thanks
benr.
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