Rio And Rio-2 Cabling Rules - IBM pSeries 670 Service Manual

RIO and RIO-2 Cabling Rules

Always connect either a one I/O planar loop or a two I/O planar loop to the first six RIO ports of the CEC
in the following order:
1. Primary I/O Book Slot 0: RIO 1 A0 & A1, RIO 2 B0 & B1
2. Secondary I/O Book Slot 2: RIO 3 C0 & C1
Note: Use required pairs of RIO ports without omitting any.
The last two RIO ports of the CEC are to connect the last I/O planar of a system with two I/O subsystems
connected with one I/O planar loops.
v Secondary I/O Book 2: RIO 4 D0&D1, one planar loop only
Note: Use required pairs of RIO ports without omitting any.
The following RIO port speeds are available:
v Standard RIO uses a thumbscrew retention physical connector and runs at 500 MB per second.
v Gigabyte RIO, or RIO-2, uses a bayonette retention physical connector and runs at 1 GB per second.
Two I/O planars are available, one for RIO and one for RIO-2, that may be placed in either side of an I/O
subsystem. They can be identified by their RIO connector style.
Rules for connecting RIO and RIO-2 CEC ports to I/O subsystem RIO and RIO-2 ports are the following:
v CEC RIO ports must not be connected to I/O subsystem RIO-2 ports, even with the available RIO-2 to
RIO cables.
v RIO-2 to RIO cables must only be used to connect CEC RIO-2 ports to I/O subsystem RIO ports.
v RIO to RIO cables must only be used to connect CEC RIO ports to I/O subsystem RIO ports.
v RIO-2 to RIO-2 cables must only be used to connect CEC RIO-2 ports to I/O subsystem RIO-2 ports.
Rules for connecting RIO and RIO-2 I/O planars to the CEC RIO and RIO-2 ports are the following:
v CEC RIO ports must be connected to 2 RIO planars per loop. Up to 3 I/O subsystems can be
connected.
v CEC RIO-2 ports can be connected to RIO and RIO-2 I/O planars with appropriate cables in one planar
loop or two planar loops in the following order:
1. Cable any I/O subsystems with RIO I/O planars in both the left and the right positions with 2 I/O
planar loop connections. The maximum data rate for each RIO I/O planar is 500 MB per second.
2. Cable any I/O subsystems with RIO-2 I/O planars in both the left and right positions with 2 I/O
planar loop connections. The maximum data rate for each RIO-2 I/O planar is 1 GB per second.
3. Cable any I/O subsystems with a RIO I/O planar in one side and a RIO-2 I/O planar in the other
side with 1 I/O planar loop connection.
The maximum data rate for the RIO I/O planar is 500 MB per second, and for the RIO-2 I/O planar,
the maximum data rate is 2 GB per second. However, in the event of a cable failure, there is no
redundant path for the 2 GB per second RIO-2 I/O planar. Restoring the redundant path for the
RIO-2 planar reduces the data rate to 1 GB per second. I/O subsystems with a RIO I/O planar in
one side and a RIO-2 I/O planar in the other side with 2 I/O planar loop connections are not
allowed.
4. Cable any I/O subsystems with RIO-2 I/O planars in both the left and the right positions with one I/O
planar loop connections. The maximum data rate for each RIO-2 I/O planar is 1 GB per second with
data path redundancy, or 2 GB per second without data path redundancy.
Note: If all I/O planars are connected to the CEC with one I/O planar loops, the maximum number of I/O
subsystems connected to the system is reduced to 2, or four I/O planars (two I/O subsystems).
40 Eserver pSeries 670 Service Guide