6.4.3. Storage requirements

When considering a cluster deployment that spans data centers, special consideration needs to be given to the selected storage integration to ensure that it also meets multisite requirements, as it pertains to accessibility from all sites, fault tolerance, high availability, and so on.

An object storage solution should be used for the registry, and this storage solution needs to be in addition to any PV storage integration used for application volumes or workloads. This object storage solution should also have the same special considerations given to accessibility from all sites, fault tolerance, high availability, and so on.

Because disk I/O is a critical factor in the health of etcd database, it is required that they are deployed on a high speed, low latency media. See etcd guidance on etcd peer round trip time and etcd database size for more details on the exact requirements to meet.