Hi Muhammed,
Sometimes due to bulk load there would be issues writing to the /sapmnt/../global fs ( Also you have your SUM directory running in /sapmnt ) in such caseS you will have errors in SM21
Do you have enough Background work process ? Would you mind sending the screenshot of RZ12 as well
Check for the Job logs of "RSUPG_FDC_CRR " in the shadow system and post .Is there any issues reported in the Database side ( Alert log etc )
Thanks ,
Manu