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DS8800 Performance Monitoring and Tuning
book

DS8800 Performance Monitoring and Tuning

by Gero Schmidt, Bertrand Dufrasne, Jana Jamsek, Peter Kimmel, Hiroaki Matsuno, Flavio Morais, Lindsay Oxenham, Antonio Rainero, Denis Senin
July 2012
Intermediate to advanced content levelIntermediate to advanced
726 pages
26h 28m
English
IBM Redbooks
Content preview from DS8800 Performance Monitoring and Tuning
Chapter 2. Hardware configuration 35
Depending on the number of installed disks and the number of required host connections,
several I/O enclosures might not contain any adapters.
DAs are called
DA pairs, because DAs are always installed in quantities of two (one DA is
attached to each processor complex). The members of a DA pair are split across two I/O
enclosures for redundancy. The number of installed disk devices determines the number of
required DAs. In any I/O enclosure, the number of individual DAs installed can be zero, one,
or two.
2.3.2 PCIe infrastructure
The DS8800 processor complex and the DS8700 processor complex use a PCI Express
(PCIe) infrastructure to access the I/O enclosures. This infrastructure greatly improves
performance ...
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Publisher Resources

ISBN: 0738436836Purchase book