$ vldb_upgrade -to vldb4-kv -online -backup-suffix .ORIG
Freezing VLDB... done (freezeid 4).
Converting /usr/afs/db/vldb.DB0 (vldb4) -> /usr/afs/db/vldb.DB0.CONV.1623364598 (vldb4-kv)
Converting fileserver entries... done.
Converting volumes... 100% (296139868 / 296139868), done.
Committing changes... done.
Installing /usr/afs/db/vldb.DB0.CONV.1623364598 to ubik... done.
Distributing new database... done.
Unfreezing VLDB... done.

Converted /usr/afs/db/vldb.DB0 from vldb4 to vldb4-kv (1622076124.1 -> 1622076125.1)
Backup saved in /usr/afs/db/vldb.DB0.ORIG