Cluster Volume Manager (CVM) uses a single port, port y, for shipping I/O from node(s). This provides only one channel for data transmission.

In an FSS environment, you can now tune LLT variables to use multiple parallel ports for I/O shipping. Using the LLT_NMULTIPORTS variable, you can set the number of ports that can provide multiple channels for the data transmission. Default value for this variable is 4. However, you can set up to 8 parallel ports for I/O shipping. These ports are internal to LLT and are not visible at GAB or CVM layer.

The data received from the CVM on port y is distributed internally among the ports, providing improved performance for I/O shipping.

Similarly, using the LLT_RDLV_MTFACTOR variable, you can change the number of threads per I/O shipping port. Default value is 2 that can be incremented up to 16.