When sync is specified in the pd_dbsync_point operand in the system common definition or the pd_dbsync_point operand is omitted, HiRDB executes deferred write processing to reduce the number of disk output operations. Deferred write processing improves performance by processing RDAREAs distributed among multiple disks in units of disks.
Therefore, when character special files are used for a HiRDB file system area in which RDAREAs are allocated and the RDAREAs are allocated on a single disk, the benefits of deferred write processing are not obtained.