The IOP
attaches to the and one or more(IOAs). The IOP processes
instructions from the system and works with the IOAs to control the I/O
devices.
There are
many different kinds of IOPs.
- Some IOPs can only support one type of I/O device. In this case the IOA is embedded in the IOP so you can not remove the IOA or change it.
- Some IOPs can support multiple device types, but only one at a time. The type of IOA that is attached determines what device can be used. IOAs on these IOPs can be changed with another IOA to support a different I/O device.
- Some IOPs can support multiple types of I/O devices at the same time. These are known as or (this depends on the type of IOP). IOAs for the supported types of I/O devices attach to the IOP.
There are
several important I/O devices in the system. These include the load source disk
unit, the alternate IPL device, the console, and the electronic customer
support hardware. The system needs to know where to locate these special devices
on secondary partitions. When you create a logical partition, you need to
identify the IOPs that control these important devices:
- The IOP that controls the disk unit that will be the load source.
- The IOP that controls the console.
- The IOP that controls the alternate IPL device.
- The IOP that controls the electronic customer support line.
Note:
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A system
with logical partitions needs to have the correct IOP feature codes for the
load source disk unit and alternate IPL devices. Without the correct
hardware, the secondary partitions will not function correctly. See the AS/400 Logical Partitions Hardware
Planning Guide
for specific hardware requirements.
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IOPs must
remain dedicated to a single logical partition. You can not share them. All
devices connected to an IOP are bound to the same logical partition. You can
not switch one I/O device to another logical partition without switching all
devices on the IOP.
On a shared
bus, you can add and remove IOPs from a logical partition without restarting
the system.
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