CEPH storage question

[azop]

Sorry, this isn't Proxmox specific but perhaps someone can help me understand.

If I have a ceph cluster with 3 nodes with each node having 1 x 2TB hard drive is the storage 1:1 on the other nodes?

If I have 500gb of video files will the total for all the nodes be 500gb used or would it be 1500gb used?

Thanks

 

[Alwin]

If I have a ceph cluster with 3 nodes with each node having 1 x 2TB hard drive is the storage 1:1 on the other nodes?

If I have 500gb of video files will the total for all the nodes be 500gb used or would it be 1500gb used?

Depends on the replica (default 3) used.

 

[azop]

Depends on the replica (default 3) used.

Thanks. Assuming we use the default 3 replica would it be a 1:3 storage (500gb would equal 1500gb used across the nodes?)

Thanks

 

[Alwin]

Thanks. Assuming we use the default 3 replica would it be a 1:3 storage (500gb would equal 1500gb used across the nodes?)

In total yes.

A good starting point to build knowledge around Ceph is its architecture guide.
https://docs.ceph.com/en/nautilus/architecture/