Three-Disk DBMS Server Configuration
The following three-disk configuration provides better performance and additional recovery options than a two-disk system:
Disk 1—Operating system, II_CHECKPOINT, II_JOURNAL, and II_DUMP
Disk 2—II_SYSTEM, II_WORK, and transaction log
Disk 3—II_DATABASE
Your backup transaction log can reside on either Disk 1 or Disk 3.