centos 版本比较

项目 RHEL3 RHEL4 RHEL5 RHEL6 备注
CPUs 8 8, 64(Large SMP) 64 4096
Memory 64GB(AMD64), 6GB(EM64T) 1TB 1TB 64TB
Process 32000 32000 32000 4194304
IPv6 - Basic Full Full
UDP-lite - - - YES
Process 32000 32000 32000 4194304
Max blockdevice size 2TB 8EB 8EB 8EB
Max boot device size - 2TB 2TB 16TB(UEFI)
Max SCSI LUNs 256 256 1024 8192
iSCSI Boot - - - YES
Ext3 Max FS Size 2TB 2TB 2TB 2TB
Ext4 Max FS Size n/a n/a 16TB 16TB
XFS Max FS Size n/a n/a 100TB(RHEL 5.5+) 100TB
NFS v2,v3 v2,v3 v2,v3,v4 v2,v3,v4,v4.1
PCI-E 3.0 n/a n/a n/a Yes
USB 3.0 n/a n/a n/a Yes
SR-IOV n/a n/a n/a Yes Single Root I/O Virtualization
Virtualization Hypervisor n/a n/a Xen(RHEL5.4) KVM (RHEL5.5+) KVM
KSM n/a n/a Yes Yes
sVirt n/a n/a n/a Yes
HA Cluster n/a External prod Integrated Integrated
HWPoison n/a n/a n/a Yes Improved reliability
Transparent Huge Page n/a n/a n/a Yes Improved Performance
Ticket spickrock n/a n/a n/a Yes Improved Performance – Preventing NUMA starvation
Performance Analysis n/a oprofile oprofile oprofile
ABRT n/a n/a n/a Yes
Control Group n/a n/a n/a Yes
Tickless kernel n/a n/a n/a Yes Power management
Scheduler O(n) O(1) O(1) CFS(Completly Fair Scheduler) more predictable
Updater up2date up2date yum yum

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