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
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