ds8870은는 rio 를
통한 cec 간의 loop가
없다. 이
역활을
그냥 i/o 를
통한 pcie 통신으로
대체
한다. 고로 8700 & 8800에
있던 rio가
없어지고 point to point pcie communication path는
유지되는
것이다.
8000은 rio 1 loop로 cec -> io drawer ->io drawer -> cec 의 communication을
했고
8700 & 8800은 cec -> i/o drawer 간에는 pcie point to point 연결이
되었고 CEC -> CEC는 RIO 연결이었다.
Figure 3-8 shows how the DS8870 hardware is shared between the servers. On the left side
and on the right side there is one processor complex (CEC). The CEC uses the N-way
symmetric multiprocessor (SMP) of the complex to perform its operations. It records its write
data and caches its read data in the volatile memory of the complex. For fast-write data, it
features a persistent memory area for the processor complex. To access the disk arrays
under its management, it has its own affiliated device adapters. The host adapters are shared
between both servers.
