1. Using Memory as a Storage Medium The image above is the storage pyramid, showing the relationship between the price of a storage medium and its speed. Today, enterprises widely adopt tape and disks as storage media mainly because of their price advantage. Market prices are driven by supply and demand: even for an expensive storage medium, if the production cost is low, the market is large enough, and the yield rate in the production process is high, its market price will come down.

1. Mount a Memory Storage Directory on the Host Create a directory to mount 1 mkdir /mnt/memory_storage Mount the tmpfs filesystem 1 mount -t tmpfs -o size=800G tmpfs /mnt/memory_storage Storage is allocated on demand, so using 100G of storage only consumes 100G of memory. The host node has 2T of memory, and here 800G is allocated to store Elasticsearch data.