Davoud Teimouri

Virtualization & Datacenter

vSphere 6.5 Configuration Maximums – Compare to Earlier Versions- Part 1

Each version of vSphere has some improvements and one of important improvements are configuration maximums that allows administrators to have much bigger virtual machines, hosting more virtual machines, use faster network and storage connections.

This is very important that you should aware about your current configuration maximums because you can prepare your forecast plans for increasing virtual machine or ESXi host resources or even changes on network or SAN environments based on these configuration maximums.

Lets review latest vSphere configuration maximums and compare them with earlier versions.

Virtual Machine

ItemvSphere 5.5vSphere 6.0vSphere 6.5
vCPU64128128
Memory1TB4TB6128GB
Swap File1TB4TB6128GB
Virtual SCSI adapters per virtual machine444
Virtual SCSI targets per virtual SCSI adapter151515
Virtual SCSI targets per virtual machine606060
Virtual disk size62TB62TB62TB
IDE controllers per virtual machine111
IDE devices per virtual machine444
Floppy controllers per virtual machine111
Floppy devices per virtual machine222
Virtual SATA adapters per virtual machine444
Virtual SATA devices per virtual SATA adapter303030
Virtual NICs per virtual machine101010
USB host controllers per virtual machine111
USB devices connected to a virtual machine202020
Parallel ports per virtual machine333
Serial ports per virtual machine43232
Concurrent remote console connections to a virtual machine404040
Video memory per virtual machine512MB512MB2GB

As you can see on the above table, maximum memory size is larger than earlier version. Six times bigger than vSphere 5.5!

Also if you have virtual desktop (VDI) in your environment, you can improve user experience by upgrade to vSphere 6.5 because you can assign maximum 2GB video memory instead of 512MB.

vSphere 6.5 allows you add “Virtual RDMA Adapter” but just one adapter per each machine.

If you want to know what is RDMA and vRDMA, you can read this link for more information.

vSphere 6.5 supports NVMe devices and you can add:

  1. 4 x Virtual NVMe adapters per virtual machine
  2. 15 x Virtual NVMe targets per virtual SCSI adapter
  3. 60 x Virtual NVMe targets per virtual machine

Note: Please consider that configuration maximums maybe not supported by guest OS.

ESXi Host

Compute Maximums

ItemvSphere 5.5vSphere 6.0vSphere 6.5
Host CPU maximums   
Logical CPUs per host320480576
NUMA Nodes per host161616
Virtual machine maximums   
Virtual machines per host51210241024
Virtual CPUs per host409640964096
Virtual CPUs per core323232
Fault Tolerance maximums   
Virtual disks161616
Virtual CPUs per virtual machine144
RAM per FT VM64GB64GB64GB
Virtual machines per host444
Virtual CPU per host 88

Each ESXi 6.5 can have 576 logical processor, that means, you can use servers with more logical cores and hosting virtual machines with more virtual cores totally.

FT has improvements but the improvements are not about FT maximums in vSphere 6.5 .

You can find more information in “What’s New in VMware vSphere 6.5” white paper.

Memory Maximum

ItemvSphere 5.5vSphere 6.0vSphere 6.5
RAM per host4TB6TB12TB
Number of swap files per VM111

About host memory, you can use 12TB memory on each ESXi 6.5 host from now but this is not an improvement actually because you could use this amount of memory if you was using OEM hardware in vSphere 6.0 .

Storage Maximum

ItemvSphere 5.5vSphere 6.0vSphere 6.5
Virtual Disks per Host204820482048
iSCSI   
LUNs per server256256512
NICs that can be associated or port bound with the software iSCSI stack per server888
Number of total paths on a server102410242048
Number of paths to a LUN (software iSCSI and hardware iSCSI)888
Software iSCSI targets256256256
NAS   
NFS mounts per host256256256
Fibre Channel   
LUNs per host256256512
LUN size64TB64TB64TB
LUN ID25510230 to 16383
Number of paths to a LUN323232
Number of total paths on a server102410242048
Number of HBAs of any type888
HBA ports161616
Targets per HBA256256256
FCoE   
Software FCoE adapters444
Common VMFS   
Volume size64TB64TB64TB
Volumes per host256256512
Hosts per volume646464
Powered on virtual machines per VMFS volume204820482048
Concurrent vMotion operations per VMFS volume128128128

VMFS 6 has been introduced in current version and there is some new features but there is no big change about VMFS 3 and VMFS 5.

A big change is number of path that increased from 1024 to 2048. More path is equal to more reliability.

Also more LUN per server, so you can have more LUNs and more paths and so more storage space totally.

This was part 1 of reviewing vSphere 6.5 configuration maximums and we’ll review and compare the rest of items in the next parts.

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vSphere 6.5 Configuration Maximums – Compare to Earlier Versions- Part 1
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Davoud Teimouri is as a professional blogger, vExpert 2015-2016-2017, VCA, MCITP. This blog is started with simple posts and now, it has large following readers.

Updated: 10/03/2017 — 7:14 pm

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