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 117
point of view of the server the data resides on a single physical disk, referred to in
z/OS as a
volume.
There is a variety of common and insignificant RAID-levels. RAID-5 has a high
I/O rate and a medium data rate. In Figure 6-6 you see that RAID-5 (just like
RAID-10) is used by the IBM DS8000 controller in the majority of configurations.
1
To help performance, the control unit is equipped with a large storage cache of
non-volatile storage, which is used for both read and write operations. A write
operation is seen by the server to be completed when the data is in the cache
(
not when it is written ...
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