My Ceph cluster has a CephFS file system, using an erasure-code data pool (k=8, m=2), which has used 14TiB of space. My CephFS has 19 subvolumes, and each subvolume automatically creates a snapshot every day and keeps it for 3 days. The problem is that when I manually calculate the disk space usage of each subvolume directory in CephFS, the total amount is only 8.4TiB. I don't know why this is happening. Do snapshots take up a lot of space?
ceph version 17.2.7 (b12291d110049b2f35e32e0de30d70e9a4c060d2) quincy (stable)
Thank you all!
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