NonStop S-Series Server Description Manual (G06.27+)

Input/Output Operations
HP NonStop S-Series Server Description Manual—520331-004
10-7
Layers of I/O Components
The “ServerNet Addressable Controllers” layer is the lowest level of the I/O
architecture, carrying out the actual transfer of data across the ServerNet hardware,
and providing the interface to the hardware I/O devices.
Figure 10-3. Queues in Controllers for Storage, in Processor for
Communications
ServerNet
Hardware
Processor
Storage I/O Communications I/O
Managing
Process
I/O
Process
Extensible I/O
(XIO)
Procedures
Request
Queue
Services
ServerNet
Transfer
Logic
ServerNet Bus Interface
S Bus NIOC Bus
Protocol
Conversion
Global
Request
Queues
SCSI
Controller
Request
Queues
SCSI
Bus
ServerNet
Addressable
Controllers
Communications
Controller
Communications
Ports
ServerNet
Adapter
or MFIOB
Module
Driver
Module
Driver
NIOC
Queues
Bus Transfer Engine (BTE) and
Access Validation and Translation (AVT)
ServerNet
Services
Application
Monitor
XIO Kernel
Queue
Services
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