HWNEP0021E ESSNI API query for Space Efficient Volume failed with ESSNI code ESSNI Code. Data from ESSNI is considered suspect.
Explanation
The ESSNI API was unable to successfully complete the requested query. This indicates a problem within the subsystem and thus the probe will terminate as any data received may be unreliable.
Action
This is usually due to an issue within the NI Services or the LPARs themselves. If the DS gives no indication as to the failure, try restarting one and then the other to see if the problem is resolved.