I am not an expert on OSSV, You can try these steps and see if it helps your situation.
The Open Systems SnapVault database consists of a set of files that contain information about the Open Systems SnapVault relationship between a primary and a secondary storage system.
OSSV agent database backup file :
The database files for an Open Systems SnapVault relationship on the primary storage system are compressed and backed up as a file named .OSSV_DATABASE_BACKUP.
If a file named .OSSV_DATABASE_BACKUP already exists in the directory being backed up, the second and subsequent files to be created follow the naming convention .OSSV_DATABASE_BACKUP_x, where x is an integer used to uniquely identify each file.
Restore (OSSV agent database ):
You can restore the database file by using the snapvault restore command; however, you must include the file name .OSSV_DATABASE_BACKUP in the command.
Example:
To restore the database from a secondary storage system called f840 to a directory \temp\database on the primary storage system, enter the following command:
D:\Program Files\netapp\snapvault\bin>snapvault restore - S f840:/vol/vol0/rel5/.OSSV_DATABASE_BACKUP D:\temp\database
Resynchronize:
Starting with Open Systems SnapVault 2.2, you can use the snapvault start -r command to resynchronize a relationship without having to reinitialize it.
1 Log in to the secondary storage system.
2 On the console, enter the following command to resynchronize a SnapVault relationship:
filer>snapvault start -r -S prim_host:dirpath /vol/sec_vol/sec_tree
filer>snapvault start -r -S melzhost:C:\melzdir /vol/sv_vol/tree_melz
https://library.netapp.com/ecmdocs/ECMM1278863/html/install/manage3.htm