What are the maximum and minimum limits for RHEL 4 vs 5 vs 6 ?

Below chart shows you the comparison of various features of Red Hat Enterprise Linux between version 4, 5 and 6.

Version 4
Version 5
Version 6
Maximum Logical CPUs
X86
32
32
32
Itanium 2
256/512
256/1024
NA
X86_64
64/64
160/255
160/4096
POWER
64/128
128/128
128
Maximum Memory
X86
64GB
16GB
16GB
Itanium 2
2TB
2TB
NA
X86_64
256GB/1TB
1TB
3TB/64TB
POWER
128GB/1TB
512GB/1TB
2TB
Required Minimum
X86
256MB
512MB minimum/1GB/logical CPU recommended
512MB minimum/1GB/logical CPU recommended
X86_64
256MB
512MB minimum/1GB/logical CPU recommended
512MB minimum/1GB/logical CPU recommended
Itanium 2
512MB
512MB minimum/1GB/logical CPU recommended
NA
POWER
512MB
1GB minimum/ 2GB recommended
2GB minimum/ 2GB required per install
Minimum Disk Space
800MB
1GB minimum/ 5GB recommended
1GB minimum/ 5GB recommended
File systems & storage limits
Maximum filesize (Ext3)
2TB
2TB
2TB
Maximum filesystem size (Ext3)
8TB
16TB
16TB
Maximum filesize (Ext4)
16TB
16TB
Maximum filesystem size (Ext4)
1EB
1EB
Maximum filesize (GFS)
16TB/8EB *
16TB/8EB *
NA
Maximum filesystem size (GFS)
16TB/8EB *
16TB/8EB *
NA
Maximum filesize (GFS2)
100TB
100TB
Maximum filesystem size (GFS2)
100TB
100TB
Maximum filesize (XFS)
100TB
100TB
Maximum filesystem size (XFS)
100TB
100TB
Kernel and OS features
Kernel foundation
Linux 2.6.9
Linux 2.6.18
Linux 2.6.32-2.6.34
Compiler
GCC 3.4
GCC 4.1
GCC 4.4

NOTE: * If there are any 32-bit machines in the cluster, the maximum gfs file system size is 16TB. If all machines in the cluster are 64-bit, the maximum size is 8EB

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