Here I have summarized the comparison with a list of selected features between vSphere ESXi 5.0, 5.1 and5.5. I have skipped some of the features for detailed overview on all the comparison factors please visit vmware's official website.
ESXi Virtual Machine Maximum
ESXi Host maximum
Storage DRS
ESXi Virtual Machine Maximum
Items
|
Maximum
| ||
vSphere 5.0
|
vSphere 5.1
|
vSphere 5.5
| |
Virtual CPUs per virtual machine
|
32
|
64
|
64
|
RAM per virtual machine
|
1 TB
|
1 TB
|
1 TB
|
Virtual SCSI targets per virtual machine
|
60
|
60
|
60
|
Virtual Disks per virtual machine
|
60
|
60
|
60
|
Virtual NIC per virtual machine
|
10
|
10
|
10
|
Concurrent remote console connection per virtual machine
|
40
|
40
|
40
|
Virtual disk size
|
2 TB
|
2 TB
|
62 TB
|
Video memory per virtual machine
|
128 MB
|
128 MB
|
512 MB
|
ESXi Host maximum
Items
|
Maximum
| ||
vSphere 5.0
|
vSphere 5.1
|
vSphere 5.5
| |
Logical CPUs per host
|
160
|
160
|
320
|
Virtual machine per host
|
512
|
512
|
512
|
Virtual CPUS per host
|
2048
|
2048
|
4096
|
Virtual CPUs per core
|
25
|
25
|
32
|
FT Virtual Disks
|
16
|
16
|
16
|
RAM per FT virtual machine
|
64
|
64
|
64
|
FT virtual machine per host
|
4
|
4
|
4
|
FT virtual CPUs per virtual machine
|
1
|
1
|
1
|
Memory Maximum
Items
|
Maximum
| ||
vSphere 5.0
|
vSphere 5.1
|
vSphere 5.5
| |
RAM per host
|
2 TB
|
2 TB
|
4 TB
|
No of swap files per virtual machine
|
1
|
1
|
1
|
Swap file size
|
1 TB
|
1 TB
|
NA
|
Storage Maximum
Items
|
Maximum
| ||
vSphere 5.0
|
vSphere 5.1
|
vSphere 5.5
| |
Virtual Disks per host
|
2048
|
2048
|
2048
|
LUNs per server
|
256
|
256
|
256
|
Broadcom 1Gb iSCSI HBA initiator ports per server
|
4
|
4
|
4
|
Broadcom 10Gb iSCSI HBA initiator ports per server
|
4
|
4
|
4
|
No. of total paths on a server
|
1024
|
1024
|
1024
|
No. of paths to a LUN
|
8
|
8
|
8
|
Software iSCSI targets
|
256
|
256
|
256
|
LUNs per host
|
256
|
256
|
256
|
LUN size
|
NA
|
64 TB
|
64 TB
|
No. of paths to a LUN
|
32
|
32
|
32
|
No. of total paths on a server
|
1024
|
1024
|
1024
|
No. of HBAs of any type
|
8
|
8
|
8
|
HBA ports
|
16
|
16
|
16
|
Targets per HBA
|
256
|
256
|
256
|
Concurrent vMotion operations per datastore
|
128
|
128
|
128
|
Concurrent storage vMotion operations per datastore
|
8
|
8
|
8
|
Concurrent storage vMotion operations per host
|
2
|
2
|
2
|
Concurrent vMotion operations per host (1Gb/s network)
|
4
|
4
|
4
|
Concurrent vMotion operations per host (10Gb/s network)
|
8
|
8
|
8
|
Cluster and resource pool maximums
Items
|
Maximum
| ||
vSphere 5.0
|
vSphere 5.1
|
vSphere 5.5
| |
Hosts per cluster
|
32
|
32
|
32
|
Virtual machine per cluster
|
3000
|
4000
|
4000
|
Virtual machines per host
|
512
|
512
|
512
|
Resource pools per host
|
1600
|
1600
|
1600
|
Children per resource pool
|
1024
|
1024
|
1024
|
Resource pools per cluster
|
1600
|
1600
|
1600
|
vCenter Server maximums
Items
|
Maximum
| ||
vSphere 5.0
|
vSphere 5.1
|
vSphere 5.5
| |
Hosts per vCenter Server
|
1000
|
1000
|
1000
|
Powered‐on virtual machines per vCenter Server
|
10000
|
10000
|
10000
|
Registered virtual machines per vCenter Server
|
1500
|
1500
|
1500
|
Linked vCenter Servers
|
10
|
10
|
10
|
Hosts in linked vCenter Servers
|
3000
|
3000
|
3000
|
Concurrent vSphere Client connections to vCenter Server
|
100
|
100
|
100
|
Number of host per datacentre
|
500
|
500
|
500
|
Registered virtual machines in linked vCenter Servers
|
50000
|
50000
|
50000
|
Storage DRS
Items
|
Maximum
| ||
vSphere 5.0
|
vSphere 5.1
|
vSphere 5.5
| |
Virtual disks per datastore cluster
|
9000
|
9000
|
9000
|
Datastores per datastore cluster
|
32
|
32
|
32
|
Datastore clusters per vCenter
|
256
|
256
|
256
|
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