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vSphere 5.1 Vs vSphere 5.5


Features
vSphere 5.1
vSphere 5.5
Physical CPUs per host
160
320
Physical RAM per host
2  TB
4 TB
NUMA nodes per host
8
16
Maximum vCPUs per host
2048
4096
VMDK Size
2TB
62 TB
Max Size of Virtual RDM
2TB
62 TB
VM Hardware Version
9
10
40 GBps physical Adapter support
No
yes
ESXi Free version RAM limit
32 GB
 unlimited
ESXi Free version maximum vSMP
8-way virtual SMP
8-way virtual SMP
16 GB fibre channel End-to-End support
Support to run these HBAs at 16Gb. However, there is no support for full, end-to-end 16Gb connectivity from host to array.
Yes
APP HA
No
Yes
vFlash Read Cache support
No
Yes
VMware VSAN support
No
Yes
Expanded v-GPU and G-GPU support
only NVIDIA
NVIDIA, AMD and Intel GPU
vCenter Server Appliance With
 Embedded Database support upto
5 Hosts and 50 Virtual
 Machines
100 Hosts and 3000 Virtual
Machines
Microsoft Windows 2012 Cluster Support
No
Yes
PDL (Permanent Device Loss) AutoRemove
No
Intoduced in vSphere 5.5
Graphics acceleration support for Linux
Guest OS
No
Yes
Hot-pluggable SSDPCIe devices
No
Yes
Support for Reliable Memory Technology
No
Yes
CPU C-state Enhancement
Host power management leveraged only the performance state (P-state), which kept the
processor running at a lower frequency and voltage
Processor power state (C-state)
also is used, providing additional power savings
 and increased Performance
 LSI SAS support for Oracle Solaris 11 OS
No
Yes
vSphere Big Data Extensions
No
Yes
SATA-based virtual device nodes via
AHCI (Advanced Host Controller Interface) support
No
Yes (Support upto 120
devices per VM)
Improved LACP Support
one LACP group per
distributed switch
Supports up to 64
Multiple point-in-time replicas
vSphere Replication kept
only the most recent copy
of a virtual machine
Version 5.5 can keep up to
24 historical snapshots


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