gmirror(8) rebuild speed

Boris Kochergin spawk at
Thu Apr 22 11:07:47 UTC 2010

Jordi Espasa Clofent wrote:
> Hi,
> I wonder if is possible to configure the gmirror rebuild speed.
> Neither I've found any related info in the net nor the man pages.
This doesn't do exactly what you want, but might address your problem, 
anyway: try "renice +20 [gmirror PID]", where "[gmirror PID]" is the PID 
of the system process handling your mirror (ps auxw | grep g_mirror). I 
know that back when ZFS code ran in separate processes back in RELENG_7, 
renicing the zpa_zio* and spa_scrub_thread processes made the system a 
lot more responsive during a scrub.


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