User`s guide

StorageWorks RAID Array 200 Controller Installation and Standalone Configuration Utility
6–10 EK–SWRA2–IG. C01
Figure 6–7 The SCSI Transfer Parameters for the Specified Channel
3. Press the Enter key to scroll through the Data transfer rate options. The
default is 10 MHz. The 10 MHz setting provides the best performance, and
supports only a 3 meter SCSI cable length. Select the 5 MHz setting if you
plan to use a 6 meter SCSI cable. Select asynchronous only if the drives in
your subsystem do not support synchronous operation.
4. Use the arrow keys to highlight the Command tagging option. Command
tagging is enabled by default. Command tagging allows the controller to
queue up to two commands to each drive. With command tagging disabled,
the controller queues only a single command to each drive, which provides
lower performance. Press the Enter key to disable command tagging, if
required.
5. When you finish setting the SCSI Transfer Parameters for the specified
channel, press Esc to return to the Edit/View Parameters menu.
6. Repeat Steps 1–5 until you have set these parameters for each channel on
your controller.