If you encounter a slowdown condition in your NCP, there are not enough buffers in the NCP to keep up with the amount of data being transferred to VTAM®. An NCP slowdown condition causes a message to be issued to the operator. However, you can also examine the SLODN tuning statistic to analyze the frequency that an NCP reaches a CWALL threshold condition, which can be encountered after the NCP has entered slowdown.

Slowdown in a channel-attached SNA cluster controller means that the controller (for example, the 3174) is out of buffers. The SLODN tuning statistic identifies when an SNA controller enters this condition.

Slowdown for a multipath channel connection indicates the number of times that read subchannel has gone into slowdown. Slowdown occurs when there is a shortage of IOBUFs when deblocking a multipath channel (MPC) read buffer.