Storage Replication Adapters (SRA) disappear from SRM UI after upgrading SRM Appliance.
This is a rare issue known to affect random SRM upgrades.
1. Log in to the Site Recovery Manager Appliance Management Interface as admin.
2. Download the configuration archive for the Storage Replication Adapters you want to delete.
3. Download the latest SRA you want from here by clicking on the Drivers & Tools tab.
4. Upload the latest SRA
5. Rescan adapter from SRM UI
Follow this process on all the SRM Appliances where the SRAs are missing.