18IBM Power Systems 775 for AIX and Linux HPC Solution
The links that are connected on the host side are called the Primary Up Stream (PUS) and
Primary Down Stream (PDS) links. The links on the cascaded side are called the Secondary
Up Stream
(SUS) and Secondary Down Stream (SDS) links.
The SuperNOVA US and downstream links each include two dedicated spare lanes. One of
these lanes is used to repair either a clock or data connection. The other lane is used only to
repair data signal defects. Each segment (host to SuperNOVA or SuperNOVA to SuperNOVA
connection) of a cascaded memory channel is independently deployed of their dedicated
spares per link. This deployment maximizes the ability to survive multiple interconnect hard
failures. The spar ...
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