Expansion Enclosure; Rxe-100 Expansion Enclosure - IBM 88553RX Installation Manual

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1.6 RXE-100 Expansion Enclosure

The attachment of an RXE-100 Remote Expansion Enclosure is also supported.
These are supported in a number of configurations with some configurations
offering redundancy. The RXE-100 is connected to the x455 via one or two
remote I/O cables and has a throughput of 1 GBps. It is available as standard
with six PCI-X slots available but is upgradable to 12 PCI-X slots, giving you up to
a total of 12 PCI-X or 18 PCI-X slots, respectively. In a multinode configuration an
RXE-100 can be shared by two machines. This allows a total of one RXE-100 in
a 2-node partition and two RXE-100s in a 4-node partition.
For systems configured for RXE failover, one of the RXE Expansion Port
connections may fail at either runtime or boot time and the system will continue to
operate properly. Failover capability requires the RXE-100 to be configured with
12 slots, be configured in unified (that is, non-shared) mode, and have both RXE
Expansion Ports connected. Runtime failures will be logged in the System Error
Log. The broken connection is not re-established at runtime. A Reboot is
required to recover failover capability.
An RXE-100 connection also requires the connection of the RXE management
port(s). There is no failover capability for RXE management port connections.
Important: Although other combinations of attaching RXE-100s in a
multinode partition will work, they are not supported configurations.
The following connectivity options are supported:
Connecting one 6-slot RXE to one x455
Connecting one 12-slot RXE to one x455 using one or (recommended) two
data cables
Sharing one 12-slot RXE between two independent x455s
Connecting one RXE to a two-node x455, configured so as to share the slots
between the nodes
Connecting one RXE to a 4-node x455 (one RXE connected to two of the
nodes, either nodes 1 and 2, or nodes 3 and 4)
Connecting two RXEs to a 4-node x455 (one RXE connected to two of the
nodes), configured so as to share the slots between nodes 1 and 2, and
between nodes 3 and 4
See "Remote Expansion Enclosure connectivity" on page 70 for details.
Chapter 1. Technical description
21

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