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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.)
Type or select values in entry fields.
SCSI Adapter
Description
Status
Location
PCI-SCSI I/O Processor type
Adapter card SCSI ID
BATTERY backed adapter
Negotiate after SCSI check condition
Maximum synchronous data transfer rate (mHz)
Wide bus enabled
SCSI bus transceiver alternative
Number of DMA bursts per PCI bus ownership
DMA bus memory LENGTH
Target mode bus memory length
Ultra speed on SE bus w/external cable
Bus mode limiting wide transfer with 2 cables SE
Parallel protocol request enabled..............yes
Domain validation enabled......................yes
Apply change to DATABASE only
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.
Change / Show Characteristics of a SCSI Adapter
Enter AFTER making all desired changes.
[Entry Fields]
scsi4
Wide/Ultra-3 SCSI I/O
Available
20-58
53C1010
[7]
no
yes
40
yes
LVD/SE
64
(0x200000)
(0x40000)
disable
no
Chapter 5. Installing Adapter Hardware
17
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