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Enterprise Linux 2.1
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Red Hat Enterprise Linux, version 2.1

Red Hat Enterprise Linux, version 3, was announced in September 2003, with initial product delivery beginning the following month. While version 3 provides many compelling new features, some customers will wish to continue to use version 2.1.

Reasons for purchasing version 2.1 include:

  • To maintain an identical user, administration and application environment as existing 2.1 systems.
  • At the time of version 3 release, version 2.1 had more extensive ISV application and OEM hardware certifications. ISVs and OEMs are actively certifying their products on version 3 but it is expected that it will take several months before the same level of certification as version 2.1 is achieved. View the latest ISV application certifications for both Red Hat Enterprise Linux versions.
  • Some organizations have centralized product approval processes which have not yet been updated to authorize version 3 purchases.

To handle these situations, customers who purchase Red Hat Enterprise Linux may download either version 2.1 and/or version 3, depending on their requirements. Note that all Red Hat Enterprise Linux subscriptions include the right to upgrade to new versions at no additional cost.

The following list outlines the major differences and similarities between Red Hat Enterprise Linux version 2.1 and version 3:

  Version 2.1 Version 3
Red Hat Enterprise Linux products, services & prices for X86-compatible systems Identical for both versions
Itanium systems Services and prices identical for both versions

Product name change:
  • Version 2.1: Red Hat Advanced Server/Workstation for the Itanium Processor

  • Version 3: Red Hat Enterprise Linux AS/WS
AMD64 systems No support Full support
IBM architectures No support (support available using Red Hat Linux 7.1/7.2 products) Full support
AS system limits(x86):
Maximum logical CPUs
Maximum memory


ES system limits (x86):
Maximum physical CPUs
Maximum memory


WS system limits(x86):
Maximum physical CPUs


Maximum SCSI devices 128 256
Maximum per-process virtual address space 3GB Approx 4GB (3.7)
Asynchronous I/O for storage devices Yes Yes
Native POSIX Threading Library No Yes
Hyperthreading scheduler No Yes
CoE compliant Yes No
LSB compliant Yes - 1.2 Yes - 1.3
NIAP/CC EAL 2 certified No In process
Kernel foundation Linux 2.4.9 Linux 2.4.21
Cluster Manager technology Bundled with AS
Not available for ES
Unbundled from AS
Available for AS & ES as a layered product
Desktop GUI GNOME Red Hat Bluecurve
Desktop features:
Ximian Evolution


Compiler GCC 2.9.6 GCC 3.2
Completed benchmarks TPC-C, TPC-R, Ecperf, NotesBench, SPECjAppServer2001 TPC-C
Logical Volume Manager No Yes
Supports Red Hat Developer Suite layered product No Yes

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