Ceph » bluestore

https://docs.ceph.com/en/latest/rados/configuration/bluestore-config-ref/#sizing

Following the link above, I can see that there is a basic rule for block.db size. However, in actual production activities, users who use CEPH with us have some confusion in planning storage capacity. For example, if users deploy a cepH cluster and use block storage first, Block. db size is the size planned for block storage before CEPH cluster deployment. This means that block.db size is set incorrectly before CEPH cluster deployment.