Understanding Redundancy of QFX3100 Director Device Components and Functionality
The QFX3100 Director device is designed to provide redundancy in platforms and components to minimize the possibility that a single point of failure can cause an entire QFabric system to fail.
Two QFX3100 Director devices are connected together in a QFX3100 Director group to provide control plane and management network redundancy for a QFabric system.
The hardware components of a single QFX3100 Director device are also designed for redundancy to minimize the possibility that a single point of failure causes a Director device to fail.
QFX3100 Director Device Redundancy
Two QFX3100 Director devices are connected together in a QFX3100 Director group to provide control plane and management network redundancy for a QFabric system. When one QFX3100 Director device fails, the second QFX3100 Director device in the QFX3100 Director group continues to operate with minimal network disruption.
The HDD modules in the two QFX3100 Director devices operate in a redundant array of independent disks (RAID) system to synchronize directories or files across the two Director devices in a QFX3100 Director group. The QFX3100 Director devices are connected together through two ports on each Director device.
QFX3100 Director Device Component Redundancy
The following hardware components provide redundancy on a QFX3100 Director device:
Power supplies—There are two power supplies in a QFX3100 Director device. Each power supply provides power to all components in the device. The two power supplies provide full power redundancy to the device. If one power supply fails or is removed, the second power supply balances the electrical load without interruption.
Cooling system—There are three fan modules in a QFX3100 Director device. If a fan module fails and is unable to keep the QFX3100 Director device within the desired temperature limits, chassis alarms are triggered and the QFX3100 Director device may shut down.
Hard disk drive (HDD) modules—There are two HDD modules in a QFX3100 Director device. The HDD modules are fully redundant storage units; each time a directory or file is stored on one HDD module, the same directory or file is stored on the other HDD module.