Check stats with

# -h Usage: [-hvx] [-f fields] [-o file] [-s string] [interval [count]] -h : Print this help message -v : List all possible field headers and definitions -x : Print extended stats -f : Specify specific fields to print (see -v) -o : Redirect output to the specified file -s : Override default field separator with custom character or string Examples: -o /tmp/a.log 2 10 -s "," -o /tmp/a.log 2 10 -v -f time,hit%,dh%,ph%,mh% 1

Set arc max in /etc/modprobe.d/zfs.conf, defaults to 50% memory.

For example, 48GiB:

echo "options zfs zfs_arc_max=51539607552" > /etc/modprobe.d/zfs.conf

Rebuild kernel, then reboot.

mkinitcpio -p linux

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