Swapfiles by default in Ubuntu

By default, in Ubuntu, we usually create a swap partition. Back in the day of 4MB RAM cards this made total sense, as the ration of RAM to disk space, was still very low. Things have changed since. Server, desktop, embedded systems have migrated to newer generations of both RAM and persistent storage. On the high performance side of things we see machines with faster storage in the form of NVMe an

[tmatsuu]

Ubuntu 17.04はLVMなしの場合swapパーティションは作られず、ディスク空き容量の5%（上限2GB）でswapfileを作成。LVMありの場合はsnapshotの対象外にできないためswap用LVが用意される。なるほど。