OS Red Hat Enterprise Linux technology capabilities and limits

2021.05.13 23:44

Maximum logical CPUs

Red Hat defines a logical CPU as any schedulable entity. So every core/thread in a multicore/thread processor is a logical CPU.

Architecture	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
x86	16	32	32	32	N/A³	N/A³
Itanium 2	8	256 [512]	256 [1024]	N/A³	N/A³	N/A³
x86_64	8	64 [64]	160 [255]	448 [4096]¹³	768 [5120]¹⁴	768 [8192]
POWER	8	64 [128]	128	128	768 [2048]¹⁶	POWER8: 768 [2048] POWER9: 1536 [2048]²⁰
System z	64 (z900)	64 (z10 EC)	64 (z13)	64 (z13)	256 (z13)	340 (z14)
ARM	N/A	N/A	N/A	N/A	N/A	256

Maximum memory

The architectural limits are based on the capabilities of the Red Hat Enterprise Linux kernel and the physical hardware. Red Hat Enterprise Linux 6 limit is based on 46-bit physical memory addressing. Red Hat Enterprise Linux 5 limit is based on 40-bit physical memory addressing. All system memory should be balanced across NUMA nodes in a NUMA-capable system.

Architecture	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
x86	64GB¹	64GB¹	16GB²	16GB²	N/A³	N/A³
Itanium 2	128GB	2TB	2TB	N/A³	N/A³	N/A³
x86_64	128GB	256GB [1TB]	1TB	12TB [64TB]¹¹	12TB [64TB]¹²	24TB [64TB]
POWER	64GB	128GB [1TB]	512GB [1TB]	2TB	32TB¹⁷	POWER8: 32TB [128TB] POWER9: 64TB [128TB]²¹
System z	256GB (z900)	1.5TB (z10 EC)	4TB (z13)	4TB (z13)	10TB (z13)	16TB (z14)
ARM	N/A	N/A	N/A	N/A	N/A	1.5TB [256TB]
Maximum x86 per-process virtual address space	Approx. 4GB	Approx. 4GB	Approx. 3GB²	Approx. 3GB²	N/A³	N/A³
Maximum x86_64 per-process virtual address space		512GB	2TB	128TB	128TB	128TB
Maximum POWER per-process virtual address space						4PB¹⁹

Minimum required memory

Architecture	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
x86	256MB	256MB	512MB minimum, 1 GB per logical CPU recommended	512MB minimum, 1 GB per logical CPU recommended	N/A³	N/A³
Itanium 2	512MB	512MB	512MB, 1 GB per logical CPU recommended	N/A³	N/A³	N/A³
x86_64	256MB	256MB	512MB minimum, 1 GB per logical CPU recommended	1GB minimum, 1 GB per logical CPU recommended	1GB minimum, 1 GB per logical CPU recommended¹⁸	1.5GB minimum, 1.5GB per logical CPU recommended¹⁸
POWER	512MB	512MB	1GB minimum, 2GB recommended	2GB minimum, 2GB required per install	2GB minimum, 2GB required per install	2GB minimum, 2GB required per install
System z	512MB	512MB	512MB	512MB	1GB	1GB minimum, 2GB required for installation
ARM	N/A	N/A	N/A	N/A	N/A	2GB

Minimum required disk space

RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
800MB	800MB	1GB minimum, 5GB recommended	1GB minimum, 5GB recommended	10GB minimum, 20GB recommended	10GB minimum, 20GB recommended

File systems and storage limits

Ext3

Feature	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
Maximum file size	2TB	2TB	2TB	2TB	2TB	2TB
Maximum file system size	2TB	8TB	16TB	16TB	16TB	16TB
Maximum subdirectories	32000	32000	32000	32000	32000	32000
Maximum symlink depth	8	8	8	8	8	8
ACL support	Yes	Yes	Yes	Yes	Yes	Yes

Ext4

Feature	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
Maximum file size	--	--	16TB	16TB	16TB	16TB
Maximum file system size	--	--	16TB [1EB]	16TB [1EB]	50TB [1EB]	50TB [1EB]
Maximum subdirectories	--	--	65000/unlimited	65000/unlimited	65000/unlimited	65000/unlimited
Maximum symlink depth	--	--	8	8	8	8
ACL support	--	--	Yes	Yes	Yes	Yes

GFS

Feature	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
Maximum file size	2TB	16TB [8EB]	16TB [8EB]⁴	N/A	N/A	N/A
Maximum file system size	2TB	16TB [8EB]	16TB [8EB]⁴	N/A	N/A	N/A
Maximum subdirectories	--	unlimited	unlimited	--	--	--
Maximum symlink depth	--	unlimited	unlimited	--	--	--
ACL support	--	Yes	Yes	--	--	--

GFS2

Feature	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
Maximum file size	--	--	100TB [8EB]	100TB [8EB]	100TB [8EB]	100TB [8EB]
Maximum file system size	--	--	100TB [8EB]	100TB [8EB]	100TB [8EB]	100TB [8EB]
Maximum subdirectories	--	--	--	unlimited	unlimited	unlimited
Maximum symlink depth	--	--	--	unlimited	unlimited	unlimited
ACL support	--	--	--	Yes	Yes	Yes

XFS

Feature	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
Maximum file size	--	--	100TB [8EB]	100TB [8EB]	500TB [8EB]	8EB
Maximum file system size	--	--	100TB [16EB]	300TB [16EB]¹⁵	500TB [16EB]	1PB
Maximum subdirectories	--	--	unlimited	unlimited	unlimited	unlimited
Maximum symlink depth	--	--	8	8	8	8
ACL support	N/A	N/A	Yes	Yes	Yes	Yes

Storage

Feature	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
Maximum Boot LUN size (BIOS)	--	--	2TB	2TB⁷	2TB⁷	2TB
Maximum Boot LUN size (UEFI)	--	--	N/A	32bit (i686) - 2TB, 64bit - 16TB (tested limit)	50TB	8EB
Maximum number of device paths (`sd` devices)	256	256 ⁹	1,024 ^9,10	8,192 ^9,10	10,000 ^9,10	10,000 ^9,10

Kernel and OS features

Feature	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
Kernel foundation	Linux 2.4.21	Linux 2.6.9	Linux 2.6.18	2.6.32 - 2.6.34	3.10	4.18
Compiler/toolchain	GCC 3.2	GCC 3.4	GCC 4.1	GCC 4.4	GCC 4.8.2	GCC 8.2.1
Languages supported	10	15	19	22	22	TBD
NIAP/CC certified	Yes (3+)	Yes (4+)	Yes (4+)	Yes (4+)	Under Evaluation (4+)	Under Discussion
Common Criteria certified KVM	--	--	Evaluated	Evaluated	Under Evaluation	--
IPv6	--	--	Ready Logo Phase 2	Ready Logo Phase 2	Under Evaluation	Under Discussion
FIPS certified	--	--	Yes (7 modules)	Yes (8 modules)	Under Evaluation (9 modules)	Under Discussion
Common Operating Environment (COE) compliant	Yes	Yes	N/A	N/A	N/A	Under Discussion
LSB-compliant	Yes - 1.3	Yes - 3	Yes - 3.1	Yes - 4.0	Under Evaluation (4.1)	Under Discussion
GB18030	No	Yes	Yes	Yes	Yes	Yes

Client environment

Feature	RHEL 3	RHEL 4	RHEL 5	RHEL 6	RHEL 7	RHEL 8
Desktop GUI	Gnome 2.2	Gnome 2.8	Gnome 2.16	Gnome 2.28	Gnome 3.8	Gnome 3.28⁸
Graphics	XFree86	X.org	X.org 7.1.1	X.org 7.4	X.org 7.7	Wayland 1.15⁸
OpenOffice	v1.1	v1.1.2	v2.0.4 ⁸	v3.2 ⁸	LibreOffice v4.1.4 ⁸	LibreOffice v6.0.6.1⁸
GNOME Evolution	v1.4	v2.0	v2.8.0	v2.28	v3.8.5	v3.28.5⁸
Default browser	Mozilla	Firefox	Firefox 1.5 ⁸	Firefox 3.6 ⁸	Firefox 24.5 ⁸	Firefox 60.5.1⁸

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