pve zfs 新增 swap

zfs create -V 4G -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

swapoff -a
mkswap -f /dev/zvol/rpool/swap
swapon /dev/zvol/rpool/swap

echo /dev/zvol/rpool/swap none swap defaults 0 0 >> /etc/fstab