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swap on ZFS
zfs create -V 8G -b $(getconf PAGESIZE) -o compression=zle \ -o logbias=throughput -o sync=always \ -o primarycache=metadata -o secondarycache=none \ -o com.sun:auto-snapshot=false rpool/swap mkswap -f /dev/zvol/rpool/swap
UUID=04abad40-3f64-4e42-b9fd-9126f30d2dab none swap defaults 0 0