Storage Area Network (SAN) topologies define how storage devices, hosts, and switches are interconnected to ensure efficient data transfer, scalability, and redundancy. The three primary SAN topologies are:
1️⃣ Point-to-Point Topology
- Structure: A direct connection between a single host and a single storage device.
- Pros:
- Simple and easy to configure.
- High performance due to a dedicated connection.
- Cons:
- Limited scalability (one-to-one connection).
- No redundancy—single point of failure.
2️⃣ Fibre Channel Arbitrated Loop (FC-AL) Topology
- Structure: Devices are connected in a loop (ring-like) configuration, either directly or through a hub.
- Pros:
- Cost-effective compared to switched fabrics.
- Can support multiple devices in a shared bandwidth setup.
- Cons:
- Performance bottlenecks since all devices share the same bandwidth.
- A single device failure or disconnection can disrupt the entire loop.
3️⃣ Switched Fabric Topology (Most Common in Modern SANs)
- Structure: Uses Fibre Channel switches to interconnect multiple hosts and storage devices dynamically.
- Pros:
- High scalability—easy to add more devices.
- High availability with multiple redundant paths.
- Better performance due to dedicated communication paths.
- Cons:
- More expensive than FC-AL.
- Requires complex configuration and management.