Virtualization Pro

Jun 1 2009   9:30PM GMT

Configuration Maximum document updated for vSphere

Eric Siebert Eric Siebert Profile: Eric Siebert

VMware publishes a great document called Configuration Maximums that details all the configuration maximums for the various components of virtual machines, hosts and vCenter servers. With the vSphere release, VMware has created a new document that has both new and modified configuration maximums specifically for vSphere. I went through and compared the latest VI3 document with the vSphere document and I noted some differences between the two, which are listed below.

Virtual Machine

VI 3.5

vSphere 4

Number of virtual CPUs per virtual machine

4

8

RAM per virtual machine

64 GB

255 GB

NICs per VM

4

10

Concurrent remote console sessions

10

40

ESX host

VI 3.5

vSphere 4

Hosts per storage volume

32

64

Fibre Channel paths to LUN

32

16

NFS Datastores

32

64

Hardware iSCSI initiators per host

2

4

Virtual CPUs per host

192

512

Virtual Machines per host

170

320

Logical processors per host

32

64

RAM per host

256 GB

1 TB

Standard vSwitches per host

127

248

Virtual NICs per standard vSwitch

1,016

4,088

Resource pools per host

512

4,096

Children per resource pool

256

1,024

Resource pools per cluster

128

512

You should pay special attention to the many footnotes in the document that detail special circumstances for some of the maximums.

One important footnote, first noted by Duncan Epping, is that the maximum virtual machines per host in an high-availability cluster is 100, but if there are more than eight hosts in a single cluster, the maximum virtual machines per host is only 40. This important footnote definitely limits the number of larger hosts that you can have in a cluster and will influence how you design your clusters.

The Configuration Maximum documents for VI3 and vSphere are both available on VMware’s website. Be sure to periodically check the documentation links for new releases, as these documents are sometimes updated when any changes occur from new versions of ESX and vCenter Server being released.

 Comment on this Post

 
There was an error processing your information. Please try again later.
Thanks. We'll let you know when a new response is added.
Send me notifications when other members comment.

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Forgot Password

No problem! Submit your e-mail address below. We'll send you an e-mail containing your password.

Your password has been sent to: