When considering SAN to SAN replication between sites, which of the following is the MOST important concern?

SAN to SAN replication across sites involves transmitting large volumes of block-level data over a Wide Area Network (WAN). The WAN link speed dictates the bandwidth available for this data transfer, which directly influences the replication latency and the achievable Recovery Point Objective (RPO) and Recovery Time Objective (RTO). An insufficient WAN link speed will severely limit the effectiveness and performance of the replication.

While block size can be optimized for replication, it is a configuration detail that is secondary to the fundamental throughput capacity of the WAN link.

Disk size primarily relates to storage capacity, not the speed or efficiency of data replication between SANs.

File system type is relevant for the host's access to the LUNs but does not directly control the performance of block-level data transfer between SAN arrays during replication.