December 2006
Intermediate to advanced
228 pages
6h 20m
English
book
Introduction to the New Mainframe: Large-Scale Commercial Computing
by Mike Ebbers, Pilar Gonzalez Adrados, Frank Byrne, Rodney Martin, Jon Veilleux
Content preview from Introduction to the New Mainframe: Large-Scale Commercial Computing
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Chapter 6. Accessing large amounts of data 115
As illustrated in Figure 6-4, the CSS uses the UCW to find the CUCBs, and
decides which is the best channel/control unit pair to use for the operation. After
this decision is made, the relevant channel microprocessor is signalled to start
the I/O. When the I/O operation is complete, the channel notifies the CSS, which
in turn notifies a CP.
6.6 DASD subsystem
Figure 6-5 DASD subsystem
The combination of a control unit and a number of disk drives is referred to as a
DASD subsystem, shown in Figure 6-5. The control unit allows the use of devices
that may not have been designed for a channel architecture ...
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