Stretched StorPool clusters are possible in both single-layer (compute+storage) deployments and dual-layer (storage-only) deployments.
Stretched clusters have very strict requirements with regard to latency and reliability of the network between cluster nodes. Stretched clusters are created on a case-by-case basis after examining the exact network properties.
StorPool, StorPool [SDS]/19.01, x86
Stretched Cluster (SC), Disaster Recovery, Data Availability