128
IBM
Eserver
p5 590 and 595 System Handbook
RIO-2 Loop Attachment Adapters (FC 7818). Each of these adapters has two
ports and can support one RIO-2 loop. Up to six of the adapters can be installed
in each 16-way processor book.
I/O drawers may be connected to the CEC in either single-loop or dual-loop
mode.
Single-loop mode connects an entire I/O drawer to the CEC using a single
RIO-2 loop. The two I/O planars in the I/O drawer are connected together
using a short RIO-2 cable. Single-loop connection requires one loop (2 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 using a separate RIO-2
loop. Dual-loop connection requires two loops (4 ports) per I/O drawer.
Dual-loop mode is recommended whenever possible as it provides the
maximum bandwidth between the I/O drawer and the CEC. On initial orders of
p5-590 and p5-595 servers, IBM Manufacturing will place
dual-loop-connected I/O drawers as the lowest numerically designated
drawers followed by any single-looped I/O drawers.
Table 5-4 and Table 5-5 indicate the number of single-looped and double-looped
I/O drawers that can be connected to a p5-590 or p5-595 server based on the
number of processor books installed.
Table 5-4 p5-590 I/O drawers quantity with different loop mode
Table 5-5 p5-595 I/O drawers quantity with different loop mode
5.2.7 Disks, boot devices, and media devices
The p5-590 and p5-595 servers must have access to a device capable of reading
CD media or to a network installation manager (NIM) server.
Single-looped
Dual-looped
1 processor book
6
3
2 processor books
8
6
Single-looped
Dual-looped
1 processor book
6
3
2 processor books
12
6
3 processor books
12
9
4 processor books
12
12
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