User Manual

Rev 2.3-1.0.1
Mellanox Technologies
109
Deployment Example
Figure 4 shows an example of an InfiniBand subnet that has been configured by a QoS manager
to provide different service levels for various ULPs.
Figure 4: Example QoS Deployment on InfiniBand Subnet
3.2.2.7 QoS Configuration Examples
The following are examples of QoS configuration for different cluster deployments. Each exam-
ple provides the QoS level assignment and their administration via OpenSM configuration files.
Typical HPC Example: MPI and Lustre
Assignment of QoS Levels
• MPI
• Separate from I/O load
• Min BW of 70%
• Storage Control (Lustre MDS)
• Low latency
• Storage Data (Lustre OST)
• Min BW 30%
Administration
• MPI is assigned an SL via the command line
host1# mpirun –sl 0
• OpenSM QoS policy file