Synology iSCSI deployment has become a cornerstone for businesses requiring high-performance, centralized block storage. This solution transforms Synology NAS devices into robust storage area networks, delivering the low latency and high throughput essential for demanding applications like virtualization and databases.
Understanding iSCSI and Its Core Advantages
iSCSI, or Internet Small Computer System Interface, is a storage networking standard that links data storage facilities. It operates over standard Ethernet networks, using TCP/IP to carry SCSI commands, which allows Synology NAS systems to present raw block storage volumes to servers. The primary advantage lies in consolidating storage management; instead of numerous direct-attached drives, IT administrators can manage a unified pool accessible across the network. This approach reduces physical clutter and simplifies backup strategies compared to legacy infrastructure. Furthermore, Synology’s implementation leverages hardware iSCSI offloading available on RackStation models, ensuring minimal CPU overhead for the host server. By handling the complex iSCSI protocol processing in firmware, the system maintains high efficiency without sacrificing network performance for critical workloads.
Planning Your Synology iSCSI Environment
Successful deployment begins with meticulous planning to avoid future bottlenecks. You must evaluate your current network topology, as iSCSI traffic is sensitive to latency and packet loss. Utilizing a dedicated VLAN for storage traffic is highly recommended to isolate it from general data networks and ensure consistent performance. Equally important is selecting the right RAID configuration on your Synology unit; RAID 6 or RAID 10 are typical choices that balance storage capacity with the necessary redundancy for business-critical data. Consider the number of initiators—servers requiring access—and ensure your switch supports jumbo frames to optimize packet efficiency. Ignoring these foundational steps can lead to subpar performance that undermines the benefits of the Synology iSCSI stack.
Hardware and Network Requirements
The hardware capabilities of your Synology unit directly dictate the effectiveness of the iSCSI service. Models equipped with Xeon processors and ample RAM handle multiple concurrent connections with ease, while entry-level devices may struggle under heavy load. Network interface cards must support gigabit Ethernet as a minimum, though 10GbE adapters are ideal for eliminating network congestion. You should also verify that your managed switches are configured for optimal throughput, with settings adjusted for the expected input/output operations per second (IOPS). Below is a summary of the key compatibility factors to verify before provisioning volumes.
Component | Requirement | Recommendation
Synology Model | Supports iSCSI Target | RackStation with hardware iSCSI offload
Network | Gigabit Ethernet or higher | 10GbE with jumbo frames (MTU 9000)
Switch | Managed Layer 2+ | Full-duplex switching with QoS
Configuring iSCSI Targets on DSM
The DiskStation Manager (DSM) interface streamlines the creation of iSCSI targets through an intuitive workflow. You begin by defining a shared storage space, which acts as the logical container for your volumes. Then, you create an iSCSI LUN (Logical Unit Number) that draws capacity from this shared space, effectively creating a virtual hard disk. The critical step involves configuring the iSCSI qualified name (IQN) for the server initiator, which establishes a secure one-to-one connection. Once the target is published, you must map it to the specific server IP address to prevent unauthorized access. This granular control ensures that only authenticated hosts can utilize the allocated storage resources.
