Setting ZFS cache usage back to only half (the old way)

TrueNAS General
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6

I got the following on post init command for similar reasons:

echo  34359738368 >> /sys/module/zfs/parameters/zfs_arc_max

haven’t had it randomly roll back to default in the last 20 days or so of uptime. Give it a try?

Only thing I could think of would be to shrink arc size to something very small & then back to the value that you want it to stay at as a cron. If not mistaken this’d flush:

echo  32 > /sys/module/zfs/parameters/zfs_arc_max
echo  34359738368 > /sys/module/zfs/parameters/zfs_arc_max
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