Veeam & Synology: Why I Switched from iSCSI to SMB for Better Performance
The official recommendation for Veeam is often to map iSCSI disks directly to the Backup & Replication VM, formatted with ReFS (64KB) to fully support FastClone. This allows Windows to manage the volume directly. However, in real-world scenarios with Synology NAS and SATA disks, the results can be disappointing. The iSCSI Bottleneck Despite having a 10Gb infrastructure and following standard optimizations—such as using a single LAN (no teaming) and switching from VMXNET3—my performance was consistently capped at a poor 90 MB/s. ...