FC (Fibre Channel) topologies define how Fibre Channel devices (hosts, storage, and switches) are interconnected in a Storage Area Network (SAN). There are three primary FC topologies:
- Description: A direct connection between two FC devices (e.g., a host and a storage array).
- Advantages:
- Simple to configure.
- Provides dedicated bandwidth.
- Disadvantages:
- Not scalable beyond two devices.
- No redundancy.
- Description: Devices are connected in a loop without a switch. A single device communicates at a time using arbitration.
- Advantages:
- Lower cost due to no switch requirement.
- Allows multiple devices in a shared loop.
- Disadvantages:
- Limited to 126 devices.
- Shared bandwidth can cause performance bottlenecks.
- Single failure can disrupt the entire loop.
- Description: Uses Fibre Channel switches to connect multiple devices in a fabric topology.
- Advantages:
- High scalability and performance.
- Supports multiple simultaneous communications.
- Offers redundancy and fault tolerance.
- Disadvantages:
- Higher cost due to switch requirement.
- More complex to configure and manage.
- Single Fabric: One switch or interconnected switches, a single point of failure.
- Dual Fabric: Two independent fabrics for redundancy.
- Core-Edge: A hierarchical design with core and edge switches for scalability.