Tuning Quality of Service Bandwidth Management (QBM)

Beginning with StorNext 6, the Quality of Service Bandwidth Management feature provides a way to spread I/O bandwidth among a number of clients in a controlled and configurable manner.

This feature can be used to manage all clients accessing a file system. Clients that are not configured explicitly are allocated bandwidth using default values. The classes are:

  • First Come: Used to prioritize clients actively using bandwidth above new clients.
  • Fair Share: Used to share I/O bandwidth equally or proportionally between identified clients.
  • Low Share: Used in conjunction with the main classes, First Come and Fair Share.

To configure QBM, you must specify the maximum I/O bandwidth for each stripe group. Tools are supplied to assist with measuring the bandwidth.