On Mon, Feb 11, 2013 at 05:39:27PM +0100, Jim Klimov wrote: > On 2013-02-11 17:14, Borja Marcos wrote: > > > > On Feb 11, 2013, at 4:56 PM, Tim Cook wrote: > > > >> The zpool iostat output has all sorts of statistics I think would be > >> useful/interesting to record over time. > > > > > > Yes, thanks :) I think I will add them, I just started with the esoteric > > ones. > > > > Anyway, still there's no better way to read it than running zpool iostat > > and parsing the output, right? > > > I believe, in this case you'd have to run it as a continuous process > and parse the outputs after the first one (overall uptime stat, IIRC). > Also note that on problems with ZFS engine itself, "zpool" may lock up > and thus halt your program - so have it ready to abort an outstanding > statistics read after a timeout and perhaps log an error. > > And if pools are imported-exported during work, the "zpool iostat" > output changes dynamically, so you basically need to parse its text > structure every time. > > The "zpool iostat -v" might be even more interesting though, as it lets > you see per-vdev statistics and perhaps notice imbalances, etc... > > All that said, I don't know if this data isn't also available as some > set of kstats - that would probably be a lot better for your cause. > Inspect the "zpool" source to see where it gets its numbers from... > and perhaps make and RTI relevant kstats, if they aren't yet there ;) > > On the other hand, I am not certain how Solaris-based kstats interact > or correspond to structures in FreeBSD (or Linux for that matter)?..
I made kstat data available on FreeBSD via 'kstat' sysctl tree:
# sysctl kstat
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Pawel Jakub Dawidek http://www.wheelsystems.com
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