Helix Core Server Administrator Guide: Fundamentals (2019.1)

Journal and archive location

For recoverability, the live journal should not be on the same physical device that contains the db.* files. Separating the live journal and the db.\* files also improves performance. During operations that write to the db.* files, entries are written to the live journal as records are written to the db.\* files. If the live journal and the db.* files are on the same physical device, the I/O throughput to the db.\* files is degraded. For best performance, the live journal should be on a separate storage subsystem connected to a separate host adapter. The live journal should be on a logical drive and filesystem that is optimized for sequential writes.

The versioned files should be located on a separate logical drive than the logical drives where the db.* files and the live journal are located. For best performance, the logical drive where the versioned files are located should be on a separate storage subsystem connected to a separate host adapter. Since the versioned files typically require significantly more disk space and the I/O throughput is not as critical as for the db.\* files, a more economical RAID configuration, such as RAID 5, can be used for the logical drive where the versioned files are located.