Hi Robert, Le 05/12/2023 à 10:05, Robert Sander a écrit :
On 12/5/23 10:01, duluxoz wrote:
Thanks David, I knew I had something wrong :-)
Just for my own edification: Why is k=2, m=1 not recommended for production? Considered to "fragile", or something else?
It is the same as a replicated pool with size=2. Only one host can go down. After that you risk to lose data.
Erasure coding is possible with a cluster size of 10 nodes or more. With smaller clusters you have to go with replicated pools.
Could you explain why 10 nodes are required for EC ? On my side, I'm working on building my first (small) Ceph cluster using E.C. and I was thinking about 5 nodes and k=4 m=2. With a failure domain on host and several osd by nodes, in my mind this setup may run degraded with 3 nodes using 2 distincts osd by node and the ultimate possibility to loose an additional node without loosing data. Of course with sufficient free storage available. Am I totally wrong in my first ceph approach ? Patrick