Hi, i am working on the plan for a 3 datacenter setup using ceph (in proxmox nodes). Each datacenter has 3 physical nodes to start with and 100Gbit switches. I will also have 2 x 100 Gbit/s connectivity between the datacenters (each datacenter to each other). the physical nodes have 2 x 100Gbit/s for the public network and 2 x 100Gbit/s for the cluster network. About this setup i have 2 questions. 1. is it even necessary to evaluate a stretched cluster since the WAN connections are as fast as the local ones (including the latency, since it is only 25km) ? 2. If using a stretched pool across all 3 datacenters, what happens if one datacenter fails ? I did read the documentation and the question came up, because it do not understand the sentence "Individual Stretch Pools do not support I/O operations during a netsplit scenario between two or more zones" completely, does it mean there is no IO already if one datacenter fails ? If i am on the wrong path, maybe someone has a link for me, where is can find information on this setup ? Cheers Soeren