Depolama Ağı
Defini bekliyoruz
A Storage Area Network (SAN) is a dedicated, high-speed network that provides block-level network access to consolidated, block-level data storage. Unlike Network Attached Storage (NAS), which provides file-level access, SANs connect servers to storage devices in a way that makes the storage appear as locally attached drives to the operating system. This is typically achieved using specialized protocols like Fibre Channel (FC) or iSCSI (Internet Small Computer System Interface). Fibre Channel is a high-performance, low-latency protocol traditionally used in enterprise environments, requiring dedicated hardware like Host Bus Adapters (HBAs) and FC switches. iSCSI, on the other hand, encapsulates SCSI commands within IP packets, allowing storage to be accessed over standard Ethernet networks, making it more cost-effective and easier to integrate into existing IP infrastructure. SANs are designed for high availability, performance, and scalability, making them ideal for mission-critical applications like databases, virtualization environments, and high-performance computing clusters. They allow for centralized management of storage resources, efficient data sharing between servers, and advanced features like storage provisioning, data replication, and disaster recovery.
graph LR
Center["Depolama Ağı"]:::main
Rel_network_attached_storage["network-attached-storage"]:::related -.-> Center
click Rel_network_attached_storage "/terms/network-attached-storage"
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🧒 5 yaşındaki gibi açıkla
Imagine a giant, super-fast library just for computer information. Servers can borrow books (data blocks) directly from this library as if they were on their own desk, making it quick to read and write information.
🤓 Expert Deep Dive
SANs operate at the block level, abstracting physical storage devices into logical units (LUNs) presented to servers via protocols like Fibre Channel or iSCSI. Fibre Channel utilizes a fabric architecture with WWPNs (World Wide Port Names) for device addressing and zoning for access control, offering high throughput and low latency crucial for I/O intensive workloads. iSCSI leverages the existing TCP/IP stack, using iSCSI initiators (on servers) and targets (on storage arrays) to map SCSI commands over Ethernet. This convergence simplifies infrastructure but can introduce latency and contention issues if not properly managed. Key architectural benefits include centralized storage management, improved utilization through pooling, high availability via redundant paths and hardware, and performance gains from offloading I/O processing. Trade-offs involve higher initial cost and complexity compared to NAS, especially for FC-based SANs, and the need for specialized networking and administration skills. Performance bottlenecks can occur at the network fabric, storage controllers, or host adapters.