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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
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.
x86
Itanium2
AMD64/Intel64
Power
System z
Maximum memory
x86
Itanium2
AMD64/Intel64
Power
System z
Certified
32
256
64
128
64 (z10 EC)
Certified
16GB
2TB
256GB
512GB
1.5TB (z10 EC)
http://
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