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IBM Power 595 Technical Overview and Introduction
Systems with non-looped configurations could experience degraded performance and
serviceability.
RIO-2 loop connections operate bidirectional at 1 GBps (2 GBps aggregate). RIO-2 loops
connect to the system CEC using RIO-2 loop attachment adapters (#1814). Each adapter
has two ports and can support one RIO-2 loop. Up to four of the adapters can be installed
in each 8-core processor book.
12X HCA loop connections operate bidirectional at 3 GBps (6 GBps aggregate). 12X
loops connect to the system CEC using 12X HCA loop attachment adapters (#1816). For
AIX applications up to 12 RIO-2 drawers or 30 12X I/O drawers can be attached to the
595, depending on the server and attachment configuration.
The total quantity of features #5791+#5797+#5798+#5807+#5808 must be less than or
equal to 30.
Slot plugging rules are complex, and depend on the number of processor books present.
Generally, the guidelines are:
Slots are populated from the top down.
#1816 adapters are placed first and #1814 are placed second.
A maximum of 32 GX adapters per server are allowed.
Refer to 2.8.1, “Connection technology” on page 83 for a list of available GX adapter types
and their feature numbers.
I/O drawers can be connected to the CEC in either single-loop or dual-loop mode. In some
situations, dual-loop mode might be recommended because it provides the maximum
bandwidth between the I/O drawer and the CEC. Single-loop mode connects an entire I/O
drawer to the CEC through one loop (two ports). The two I/O planars in the I/O drawer are
connected with a short jumper cable. Single-loop connection requires one loop (two ports)
per I/O drawer.
Dual-loop mode connects each I/O planar in the drawer to the CEC separately. Each I/O
planar is connected to the CEC through a separate loop. Dual-loop connection requires two
loops (four ports) per I/O drawer.
Refer to Table 2-22 on page 89 for information about the number of single-looped and double-
looped I/O drawers that can be connected to a 595 server based on the number of processor
books installed.
1.3.5 IBM i, AIX, Linux for Power I/O considerations
As we indicated previously, some operating system-specific requirements, and current
System i and System p client environments dictate differences, which are documented where
appropriate in this publication.
Examples of unique AIX I/O features include graphic adapters, specific WAN/LAN adapters,
SAS disk/tape controllers, iSCSI adapters, and specific Fibre Channel adapters.
Examples of unique IBM i I/O features include the #5094/#5294/#5088/#0588/#0595 I/O
drawers/towers (I/O enclosures), I/O Processors (IOPs), IOP-based PCI adapter cards, very
Note:
On initial Power 595 server orders, IBM manufacturing places dual-loop connected
I/O drawers as the lowest numerically designated drawers followed by any single-looped
I/O drawers.
Summary of Contents for Power 595
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