Right on Tim. Thanks. I didn't know that. I'm sure it's documented somewhere and I should have read it so double thanks for explaining it.
On Thu, Jan 17, 2013 at 4:18 PM, Timothy Coalson <tsc...@mst.edu> wrote: > On Thu, Jan 17, 2013 at 5:33 PM, Peter Wood <peterwood...@gmail.com>wrote: > >> >> The 'zpool iostat -v' output is uncomfortably static. The values of >> read/write operations and bandwidth are the same for hours and even days. >> I'd expect at least some variations between morning and night. The load on >> the servers is different for sure. Any input? >> >> > Without a repetition time parameter, zpool iostat will print exactly once > and exit, and the output is an average from kernel boot to "now", just like > iostat, this is why it seems so static. If you want to know the activity > over 5 second intervals, use something like "zpool iostat -v 5" (repeat > every 5 seconds) and wait for the second and later blocks. The second and > later blocks are average from previous output until "now". I generally use > 5 second intervals to match the 5 second commit interval on my pools. > > Tim > >
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