Storage offload is a migration method that moves the copying work from the host server to the storage layer. Instead of the hypervisor or backup tool reading every block and writing it elsewhere, the storage system performs the transfer itself. In virtualization, this can make VM moves, disk clones, and backups faster and reduce CPU and network pressure on the host.
For security teams, storage offload matters because it changes where trust and control live. If the storage array or SAN is compromised, an attacker with that access may be able to copy or clone data without touching the guest OS. Defenders also need to confirm that the backend actually supports the offload path, because unsupported storage can force a slower host-based copy or break a migration workflow. Good logging, least-privilege storage admin access, and pre-cutover testing help keep offload a performance feature instead of a hidden dependency.