Hi Luciano, It sounds like you could have the storage_compatibility_mode set to the default CASSANDRA_4 value, check this and change it to UPGRADING or NONE.
Full details can be found in the Cassandra.yaml https://cassandra.apache.org/doc/latest/cassandra/managing/configuration/cass_yaml_file.html#storage_compatibility_mode Regards Paul Sent from my iPhone > On 16 Mar 2025, at 07:48, Luciano Greiner <luciano.grei...@gmail.com> wrote: > > Hi, > > We recently upgraded our clusters from 4.1.5 to 5.0.3 and now I’m > trying to migrate SSTable files to the new oa-* format, but it’s not > working as I expected. > > What I Tried: > > nodetool flush + upgradesstables → Completed quickly with success > messages, but no SSTables were rewritten. > nodetool upgradesstables -a → Triggered compactions, but new SSTables > are still in the old nb-* format. > > What’s the recommended approach to ensure SSTables migrate to oa-*? Is > it really necessary? > > Thanks! > > Luciano
