Hello Dear!
The memory capacity on Service OM is smaller than that on IBMC due to the following reasons:
1. The host OS occupies some memory resources.
2. The management plane of the FusionSphere virtualization suite occupies some memory resources.
3. FusionStorage nodes consume some resources for OSD and VBS.
The memory of the computing plane is queried on Service OM.
If you want to query the memory resources occupied by each part based on service requirements,
You need to contact Huawei engineers for remote queries.