Red Hat Enterprise Linux specification comparison, RHEL 3/4/5/6 and RHEL 7

Let’s have a look at the specification comparison between different recent versions. Here is list of Hardware and software features (from RedHat) in RHEL 3/4/5/6 and the RHEL 7.

RHEL

Specification Version 3 Version 4 Version 5 Version 6 Version 7
Maximum logical CPUs
x86 16 32 32 32 N/A
Itanium 2 8 256 [512] 256 [1024] N/A N/A
x86_64 8 64 [64] 160 [255] 240 [4096] 160 [5120]
POWER 8 64 [128] 128 128 128
System z 64 (z900) 64 (z10 EC) 101 (zEC12) 101 (zEC12) 101 (zEC12)
Maximum memory
x86 64GB 64GB 16GB 16GB N/A
Itanium 2 128GB 2TB 2TB N/A N/A
x86_64 128GB 256GB [1TB] 1TB 6TB [64TB] 3TB [64TB]
POWER 64GB 128GB [1TB] 512GB [1TB] 2TB 2TB
System z 256GB (z900) 1.5TB (z10 EC) 3TB (z196) 3TB (z196) 3TB (z196)
Maximum number of device paths (“sd” devices)
256 256 1,024 8,192 10,000
Required minimums
x86 256MB 256MB 512MB minimum/1 GB/logical CPU recommended 512MB minimum/1 GB/logical CPU recommended N/A
x86_64 256MB 256MB 512MB minimum/1 GB/logical CPU recommended 1GB minimum/1 GB/logical CPU recommended 1GB minimum/1 GB/logical CPU recommended
Itanium 2 512MB 512MB 512MB/1 GB/logical CPU recommended N/A N/A
POWER 512MB 512MB 1GB minimum/2GB recommended 2GB minimum/2GB required per install 2GB minimum/2GB required per install
Minimum diskspace 800MB 800MB 1GB minimum/5GB recommended 1GB minimum/5GB recommended 10GB minimum/20GB recommended
File systems and storage limits
Maximum filesize (Ext3) 2TB 2TB 2TB 2TB 2TB
Maximum file system size (Ext3) 2TB 8TB 16TB 16TB 16TB
Maximum file size (Ext4) 16TB 16TB 16TB
Maximum file system size (Ext4) 16TB [1EB] 16TB [1EB] 50TB [1EB]
Maximum file size (GFS) 2TB 16TB [8EB] 16TB [8EB] N/A N/A
Maximum file system size (GFS) 2TB 16TB [8EB] 16TB [8EB] N/A N/A
Maximum file size (GFS2) 100TB [8EB] 100TB [8EB] 100TB [8EB]
Maximum file system size (GFS2) 100TB [8EB] 100TB [8EB] 100TB [8EB]
Maximum file size (XFS) 100TB [8EB] 100TB [8EB] 500TB [8EB]
Maximum file system size (XFS) 100TB [16EB] 100TB [16EB] 500TB [16EB]
Maximum Boot LUN size (BIOS) 2TB 2TB 2TB
Maximum Boot LUN size (UEFI) N/A 32bit (i686) – 2TB,
64bit – 16TB (tested limit)
50TB
Maximum x86 per-process virtual address space Approx. 4GB Approx. 4GB Approx. 3GB Approx. 3GB N/A
Maximum x86_64 per-process virtual address space 512GB 2TB 128TB 128TB
Kernel and OS features
Kernel foundation Linux 2.4.21 Linux 2.6.9 Linux 2.6.18 2.6.32 – 2.6.34 3.10
Compiler/toolchain GCC 3.2 GCC 3.4 GCC 4.1 GCC 4.4 GCC 4.8.2
Languages supported 10 15 19 22 22
NIAP/CC certified Yes (3+) Yes (4+) Yes (4+) Yes (4+) Under Evaluation (4+)
Common Criteria certified KVM Evaluated Evaluated Under Evaluation
IPv6 Ready Logo Phase 2 Ready Logo Phase 2 Under Evaluation
FIPS certified Yes (7 modules) Yes (8 modules) Under Evaluation (9 modules)
Common Operating Environment (COE) compliant Yes Yes N/A N/A N/A
LSB-compliant Yes – 1.3 Yes – 3 Yes – 3.1 Yes – 4.0 Under Evaluation (4.1)
GB18030 No Yes Yes Yes Yes
Client environment
Desktop GUI Gnome 2.2 Gnome 2.8 Gnome 2.16 Gnome 2.28 Gnome 3.8
Graphics XFree86 X.org X.org 7.1.1 X.org 7.4 X.org 7.7
OpenOffice V1.1 V1.1.2 V2.0.4 V3.2 LibreOffice V4.1.4
Gnome Evolution V1.4 V2.0 V2.8.0 V2.28 V3.8.5
Default browser Mozilla Firefox Firefox 1.5 Firefox 3.6 Firefox 24.5

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