Synology iSCSI deployment has become a cornerstone for businesses seeking a flexible, cost-effective alternative to traditional Fibre Channel storage. This block-level storage protocol allows you to create high-performance storage pools over your existing Ethernet network, eliminating the need for specialized hardware. By leveraging Synology’s robust DSM operating system, you can transform standard network infrastructure into a powerful SAN solution that delivers the low latency and high throughput essential for demanding applications.
Understanding the Synology iSCSI Architecture
The architecture centers around the iSCSI Target, which presents storage volumes to client servers, known as initiators. Synology devices function as the target, managing the storage allocation and data transfer. Initiators, typically servers running Windows, Linux, or VMware, use software or hardware adapters to connect to these targets. This setup creates a seamless integration where remote servers perceive the Synology LUNs as locally attached hard drives, enabling direct file system formatting and utilization without network file system overhead.
Performance Optimization Techniques
To maximize the potential of your Synology iSCSI environment, specific network and system configurations are essential. Jumbo Frames should be enabled on both the Synology and the client network interfaces to reduce packet overhead and increase throughput. Dedicating a separate VLAN for iSCSI traffic isolates the critical storage network from general user traffic, preventing congestion and ensuring consistent latency. Furthermore, utilizing hardware iSCSI initiators offloads processing from the server CPU, freeing up resources for actual application tasks.
Network Configuration Best Practices
Implement multipathing (MPIO) to provide redundancy and load balancing between the server and the Synology.
Ensure switches support and are configured for Jumbo Frames (MTU 9000).
Use quality of service (QoS) rules to prioritize iSCSI packets over other network traffic.
Security Considerations for iSCSI Deployments
Security is paramount when dealing with block storage, and Synology provides multiple layers of protection. The primary mechanism is the CHAP (Challenge Handshake Authentication Protocol), which requires initiators to authenticate with the target using a mutual username and password pair. For encrypted data transmission, enabling CHAP Mutual Authentication ensures that both the target and the initiator verify each other’s identity. Additionally, IP access control lists can restrict which server IPs are allowed to establish a session, adding a network-level barrier to unauthorized access.
Step-by-Step LUN Creation Process
Creating a LUN on a Synology device is a straightforward process managed through the Storage Manager and iSCSI Manager interfaces. You begin by allocating storage from your RAID or SHR pool to a new LUN, defining the desired size and block size. Once the LUN is created, you configure a new iSCSI target and associate the LUN with it. Finally, you define the access control list, specifying which iSCSI initiators are permitted to connect. This granular control ensures that only authorized servers can mount the storage.
