On 27/09/2012 17:44, Reginald Beardsley wrote:
From observed behavior, it appears that the scrub is consuming too large a share of DRAM (12 GB in this case).
in /etc/system: (then reboot) set zfs:zfs_arc_max = 0x200000000 (=8 GB) cuts it to roughly that value. Also, you can set zfs primarycache and secondarycache properties to metadata or none to lower the cache impacts (if workload is not affected too badly by this). On smaller machines (~6-12 GB), we set "metadata" and arcsize to less than 1GB. Scrub always hits you badly on smaller machines (weak IO), so we do this regularily via a cronjob only on sundays. -- Dr.Udo Grabowski Inst.f.Meteorology a.Climate Research IMK-ASF-SAT www-imk.fzk.de/asf/sat/grabowski/ www.imk-asf.kit.edu/english/sat.php KIT - Karlsruhe Institute of Technology http://www.kit.edu Postfach 3640,76021 Karlsruhe,Germany T:(+49)721 608-26026 F:-926026
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