XorMon NG can coexists with IBM Spectrum Control by monitoring same SVC/Storwize/FlashSystem/Storage Virtrualize storage under one condition.
Booth tools must use the same sample rate as both use the same data collection.

XorMon NG default sample rate is 5 minutes, TPC uses 1 minute.

Only the solution is switch TPC to 5 minutes.

Note that not all storage are affected by that.
Especially big SVC clusters (4 - 8 nodes) do not work in XorMon NG when TPC uses 1 minute sample rate.

TPC change
Navigate to this screen and change sample rate to 5 minutes: