□Duplexing. The main difference between mirroring and duplexing is that the two drives in the mirrored unit operate off one controller and the two fixed disk drives in the duplexed unit operate off two control- lers. An advantage of using dual controllers for duplexing is that the data retrieval speed is increased and the second controller pro- vides additional protection if the
system fails.
Example: In a system where two drives are duplexed, one drive may be reading data while the other drive is seeking the next block of data. The information on both fixed disk drives is the same.
NOTE: For information on component removal
and replacement, see Chapter 7,
REMOVAL AND REPLACEMENT PROCEDURES. For information on switch settings, see Chapter 8, JUMPER SETTINGS AND SWITCH SETTINGS.
9.2 SYSTEM CONFIGURATION
NOTE: Internal cables are not interchangeable between the system unit and the expansion unit.
Maximum Storage
Use the device driver, EXTDISK.SYS, and an operating system such as
