Below is a table of all the configuration maximums that changed between the vSphere 5.1 release and the vSphere 5.5 release.
Maximum Type Category vSphere 5.1 vSphere 5.5 vSphere 6.0
Virtual disk size VM Storage 2TB minus 512 bytes 62TB 62TB
Virtual SATA adapters per VM VM I/O Devices NA 4 4
Virtual SATA devices per virtual SATA adapter VM I/O Devices NA 30 30
Logical CPUs per host Host Compute 160 320 480
NUMA Nodes per host Host Compute 8 16 16
Virtual CPUs per host Host Compute 2048 4096
Virtual CPUs per core Host Compute 25 32
RAM per host Host Compute 2TB 4TB
Swap file size Host Compute 1TB NA
VMFS5 - Raw Device Mapping size (virtual compatibility) Host Storage 2TB minus 512 bytes 62TB
VMFS5 - File size Host Storage 2TB minus 512 bytes 62TB
e1000 1Gb Ethernet ports (Intel PCI‐x) Host Networking 32 NA
forcedeth 1Gb Ethernet ports (NVIDIA) Host Networking 2 NA
Combination of 10Gb and 1Gb Ethernet ports Host Networking Six 10Gb and Four 1Gb ports Eight 10Gb and Four 1Gb ports
mlx4_en 40GB Ethernet Ports (Mellanox) Host Networking NA 4
SR-IOV Number of virtual functions Host VMDirectPath 32 64
SR-IOV Number of 10G pNICs Host VMDirectPath 4 8
Maximum active ports per host (VDS and VSS) Host Networking 1050 1016
Port groups per standard switch Host Networking 256 512
Static/Dynamic port groups per distributed switch Host Networking NA 6500
Ports per distributed switch Host Networking NA 60000
Ephemeral port groups per vCenter Host Networking 256 1016
Distributed switches per host Host Networking NA 16
VSS portgroups per host Host Networking NA 1000
LACP - LAGs per host Host Networking NA 64
LACP - uplink ports per LAG (Team) Host Networking 4 32
Hosts per distributed switch Host Networking 500 1000
NIOC resource pools per vDS Host Networking NA 64
Link aggregation groups per vDS Host Networking 1 64
Concurrent vSphere Web Clients connections to vCenter Server vCenter Scalability NA 180
Hosts (with embedded vPostgres database) vCenter Appliance Scalability 5 100
Virtual machines (with embedded vPostgres database) vCenter Appliance Scalability 50 3000
Hosts (with Oracle database) vCenter Appliance Scalability NA 1000
Virtual machines (with Oracle database) vCenter Appliance Scalability NA 10000
Registered virtual machines vCloud Director Scalability 30000 50000
Powered-On virtual machines vCloud Director Scalability 10000 30000
vApps per organization vCloud Director Scalability 3000 5000
Hosts vCloud Director Scalability 2000 3000
vCenter Servers vCloud Director Scalability 25 20
Users vCloud Director Scalability 10000 25000
