To verify replication between PSCs, first you need to enable SSH on the PSC Appliance via https://<PSC-URL>:5480 URL then go following steps:
1.Go to the directory /usr/lib/vmware-vmdir/bin
cd /usr/lib/vmware-vmdir/bin
2. Issue following command to verify all of the partners
./vdcrepadmin -f showpartners -h <your psc FQDN> -u administrator
3.Issue following command to verify all the changes that had been made on each of PSCs
./vdcrepadmin -f showpartnerstatus -h
<your psc FQDN> -u administrator