Several notes may accompany the DASDID configuration chart.
NOTE
THE SCUs CANNOT BE FORMATTED. CC, CHANNEL, AND UA/DNO ARE GIVEN BY CPU.
THE SCUs INDICATED ABOVE COULD NOT BE FORMATTED FOR THE FOLLOWING REASONS.
1. THE NUMBER OF CONTROLLER IDS DOES NOT EQUAL THE NUMBER OF UA/DNOS FOR A CPU.
2. THE CONTROLLER IDS ARE NOT THE SAME FOR ALL THE CPUS ATTACHED TO THE SCU.
3. THE UA/DNOS FOR A CPU ARE EXPECTED TO CONSECUTIVELY INCREASE BY EIGHT.
THIS MAY NOT NECESSARILY BE AN ERROR.
4. THERE ARE MORE THAN FOUR UA/DNOS FOR A CPU.
5. THERE ARE MORE THAN THREE CHANNELS FOR A CPU IN 370 MODE.
6. THERE ARE MORE THAN FOUR CHANNELS FOR A CPU IN 370XA MODE.
7. THERE ARE MORE THAN FOUR CONTROLLER IDS FOR AN SCU.
Explanation of Notes: - The program generating the configuration table has found no controller
ID for any set of addresses or device numbers. Because the controller
ID defines a string of devices, there must be a unique controller
ID for each string defined by its lowest unit address/device number.
The controller ID is the first two digits of the STR parameter.
- There should be only one SCU or controller assigned to a specific
ID for the installation. The controller ID must be the same for a
string no matter which CPU it is accessed from. Check the STR parameters
to determine which strings have different controller IDs defined for
the same string.
- In order to format the unit addresses (UAs) or device numbers
(DNOs) as a range (for example: 120–12F), the numbers must be consecutive.
The numbers in the group have not been increasing consecutively by
eight.
- A maximum of four strings can connect to one SCU (unless a switch
is used). At least one CPU is found to have more than four strings
defined by controller ID or unit address/device number.
- The configuration generator provides space in the format for only
three channels from one CPU to an SCU, in 370 mode.
- The configuration generator provides space in the format for only
four channel paths from one CPU complex to an SCU, in 370XA mode.
- Four is the maximum number of strings allowed per SCU.