Because of an numerous read errors on the volume shown, the status of the volume has been set to read-only.
None.
Use QUERY VOLUME FORMAT=DETAILED for the volume to view the access mode and number of read errors. You may want to use the MOVE DATA command to move the retrievable data from this volume to another volume. For the damaged files, use the RESTORE VOLUME command to restore a readable copy of the file to the storage pool.