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Chapter 4. Capabilities and Limits
This chapter documents the capabilities and limits of Red Hat Enterprise Linux 5 as of minor release Red Hat Enterprise Linux 5.5.
Red Hat maintains a technology capabilities and limits page for Red Hat Enterprise Linux at http://www.redhat.com/rhel/compare/. This page provides the theoretical limits supported by the software as well as certified limits for generally available hardware. The theoretical limits are updated with every major release. Certified limits reflect the current state of system testing by Red Hat and its partners for mainstream hardware.
Note
All the certified limits documented in this section are current as of March 30th 2010.
Maximum Logical CPUs
Logical CPU is defined as the number of CPUs that are presented to the operating system by the hardware. Multi-core processors and hyperthreads increase the number of logical CPUs that are visible to the operating system.
| Certified | |
|---|---|
| x86 | 32 |
| Itanium2 | 256 |
| AMD64/Intel64 | 64 |
| Power | 128 |
| System z | 64 (z10 EC) |
Maximum memory
| Certified | |
|---|---|
| x86 | 16GB |
| Itanium2 | 2TB |
| AMD64/Intel64 | 256GB |
| Power | 512GB |
| System z | 1.5TB (z10 EC) |
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