Address space sizing

Address space sizing requirements ensure sufficient IP addresses for Fusion Data Foundation storage pods and OpenShift nodes.

Fusion Data Foundation with Multus requires an IP address for each Fusion Data Foundation Ceph storage daemon. Networks must have enough IP addresses to account for the number of storage pods that gets attached to the network, and some additional space to account for failover events. Expanding networks in the future might require downtime, so allocating space for the largest foreseeable cluster size is recommended.

For Multus public network, the following ranges must be planned:

• The Pod public network address space must include enough IPs for the total number of Fusion Data Foundation pods running in the openshift-storage namespace
• The node public network address space must include enough IPs for the total number of OpenShift nodes (worker + storage)

For Multus cluster network, the following range must be planned:

• The Pod cluster network address space must include enough IPs for the total number of OSD pods running in the openshift-storage namespace