Chapter 2. Architecture and technical overview
45
memory activations, and four licenses of PowerVM for Linux. This package is at a lower
overall cost than ordering the same number of processor, memory, and PowerVM activations
separately. However, the activated resources can only be used to run Linux server-based and
VIO server-based workloads.
Any combination of Linux distributions supported by PowerVM can be used in logical
partitions that use these resources. Any partitions that are running AIX cannot use these
resources, and shared processor pools need to be set up on the system to prevent this. The
Linux partitions can use any other resources that are permanently activated on the system, or
that are temporarily activated by using Elastic CoD or Utility CoD.
IFL packages can be ordered as part of the initial system order, or as an MES upgrade.
These activations are permanent, and count towards the minimum activations that are
required for the system.
It is possible to use only IFL packages for permanent activations, in which case the entire
system is restricted to running only Linux workloads.
When ordering an Integrated Facility for Linux package (#ELNN), the following no-cost
features are added to the system:
1 x four processor activations (#ELNK, #ELNL, or #ELNM depending on processor
module)
1 x 32 GB memory activation (#ELNP)
1 x four PowerVM for Linux entitlements (#ELNQ)
2.7 System buses
This section provides additional information related to the internal buses.
2.7.1 PCI Express Generation 3
The internal I/O subsystem in the Power E850C is connected directly to the PCIe controllers
on the POWER8 processor modules. Each POWER8 processor module has four buses, two
of which have 16 lanes (x16) and two of which have eight lanes (x8). This configuration
provides a total of 48 lanes of PCIe connectivity per processor node. Each lane runs at
1 GBps in each direction, giving a total maximum PCIe bandwidth per processor module of
96 GBps.
The first and second processor modules in a system use all of their available PCIe
connectivity. The third and fourth processor modules use only the two x16 connections
currently. The maximum PCIe bandwidth of a Power E850C server with four processor
modules installed is therefore 320 GBps.
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