IBM PCI Dual Channel Ultra3 SCSI Adapter, Installation And Using Manual

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Enable Ultra Speed (on External Devices) during Single-Ended Operation
When the SCSI adapter detects any external single-ended devices on the SCSI bus, it
defaults to 10 MHz operation. Use this procedure to override the default speed and run
at the Ultra signalling rate of 20 MHz (40 MB/s on a 16-bit bus).
To enable Ultra speed on external devices during single-ended operation, do the
following:
1. At the command prompt, type
smitty scsia
, and press Enter.
2. Select Change / Show Characteristics of a SCSI Adapter.
3. Select your adapter from the list, and press Enter.
Example: (This screen varies based on the adapter you select.)
Change / Show Characteristics of a SCSI Adapter
Type or select values in entry fields.
Enter AFTER making all desired changes.
[Entry Fields]
SCSI Adapter scsi4
Description Wide/Ultra-3 SCSI I/O
Status Available
Location 20-58
PCI-SCSI I/O Processor type 53C1010
Adapter card SCSI ID [7]
BATTERY backed adapter no
Negotiate after SCSI check condition yes
Maximum synchronous data transfer rate (mHz) 40
Wide bus enabled yes
SCSI bus transceiver alternative LVD/SE
Number of DMA bursts per PCI bus ownership 64
DMA bus memory LENGTH (0x200000)
Target mode bus memory length (0x40000)
Ultra speed on SE bus w/external cable disable
Bus mode limiting wide transfer with 2 cables SE
Parallel protocol request enabled..............yes
Domain validation enabled......................yes
Apply change to DATABASE only no
4. Select Ultra speed on SE bus w/external cable.
5. Press F4.
6. Select enable, and press Enter.
7. Press Enter again.
8. If the change was successful, press F10 to exit SMIT.
Chapter 5. Installing Adapter Hardware
17