zfs-properties

http://unix.derkeiler.com/Mailing-Lists/FreeBSD/stable/2012-02/msg00157.html
http://docs.oracle.com/cd/E19253-01/819-5461/6n7ht6r2s/index.html#gcfgr
get stats: cat /proc/spl/kstat/zfs/arcstats

@ruegand
zpool create \
 -o compression=on \
 -o primarycache=metadat \ # (only metadata in L1ARC)
 -o secondarycache=all \
 -o compression=on \
 -o atime=on \
 -o relatime=on \ # (depends on atime)
 -o volblocksize=4K \ # (fdisk -l | grep Sector\ size)
 -o com.sun:auto-snapshot=false \

 @db-volume
 zpool create \
  -o recordsize=8k (rdbmses commit in 8k portions)
  -o logbias=throuput (disable ZIL, cause rdbmses are alreade corruption safe)#
  
#################
 
/etc/modprobe.d/zfs.conf (https://dan.langille.org/2013/02/)
options zfs txg.synctime_ms="2000" # ?
options zfs txg.timeout="5" # ???
options zfs zfs_arc_min=536870912
options zfs zfs_arc_max=2147483648

#################
finally:

zpool create tank /dev/disk/by-partlabel/part1-mirror1 /dev/disk/by-partlabel/part2-mirror1   log /dev/disk/by-partlabel/slog1   cache /dev/disk/by-partlabel/l2arc1   -o ashift=12
zfs set compress=lz4 tank
zfs set atime=on tank
zfs set relatime=on tank
zfs set primarycache=metadata tank