1. Ceph pools
<Ceph pool> ::= <Usage> "." <Type> "." <Class>
<Usage> ::= "backup" | "data" | "linux";
<Type> ::= "cephfs-" { "data" | "metadata" } | "rbd";
<Class> ::= "hdd" | "nvme";
Examples
backup.cephfs-data.hdd
data.cephfs-metdata.nvme
linux.cephfs-data.nvme