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Kernel Extensions and Device Support Programming Concepts
Configuring the Serial Optical Link Device Driver
When configuring
the serial optical link (SOL) device driver, consider the physical and logical
devices, and changeable attributes of the SOL subsystem.
Physical and Logical Devices
The SOL subsystem consists of several physical and
logical devices in the ODM configuration database:
Device |
Description |
slc (serial link chip) |
There are two serial link adapters in each COMBO chip. The slc device is automatically detected and configured by the system. |
otp (optic two-port card) |
Also known as the serial optical channel converter (SOCC). There
is one SOCC possible for each slc. The otp device is automatically detected and configured by the system. |
op (optic port) |
There are two optic ports per otp. The op device is automatically detected and configured by the
system. |
ops (optic port subsystem) |
This is a logical device. There is only one created at any time.
The ops device requires some additional configuration
initially, and is then automatically configured from that point on. The /dev/ops0 special file is created when the ops device is configured. The ops device cannot
be configured when the processor ID is set to -1. |
Changeable Attributes of the Serial Optical Link Subsystem
The system administrator can
change the following attributes of the serial optical link subsystem:
Note
If your system uses serial optical link to make a direct,
point-to-point connection to another system or systems, special conditions
apply. You must start interfaces on two systems at approximately the same
time, or a method error occurs. If you wish to connect to at least one machine
on which the interface has already been started, this is not necessary.
Processor ID |
This is the address by which other machines connected by means of
the optical link address this machine. The processor ID can be any value in
the range of 1 to 254. To avoid a conflict on the network, this value is initially
set to -1, which is not valid, and the ops device cannot
be configured.
Note
If you are using TCP/IP over the serial optical
link, the processor ID must be the same as the low-order octet of the IP address.
It is not possible to successfully configure TCP/IP if the processor ID does
not match. |
Receive Queue Size |
This is the maximum number of packets that is queued for a user-mode
caller. The default value is 30 packets. Any integer in the range from 30
to 150 is valid. |
Status Queue Size |
This is the maximum number of status blocks that will be queued for
a user-mode caller. The default value is 10. Any integer in the range from
3 to 20 is valid. |
The standard SMIT interface is available for setting
these attributes, listing the serial optical channel converters, handling
the initial configuration of the ops device, generating
a trace report, generating an error report, and configuring TCP/IP.
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