Maximum vCPU

[maniee]

Hi all

I have the following Configuration

Intel xeon  CPU

Processor  speed                             2.3GHz

Processor Socket                             2

Processor core per socket                4

Hyper Threading                              enabled

Logical Processor      = 2 Physical Sockets* 4 Cores per Socket  *2 ( Since HT Enabled) = 16 Logical Processors

From the above calculation I can understand that  1- VM can have maximum of 16 vCPU.

What is the maximum vCPU Limit ?

Is there any thumb rule ratio (Ex  1:8  or 1:12)

16*8 =128 ( where 128 VM I can create with atleast  1vCPU)

Regards,

Maniee.

[JPM300]

If I remember correctly the new standards where around 6-12 vCPU per core. However the max is 25

Maximum vCPUs per logical cores

This all depends and every environment is different.  You can check metrics to see if your CPU's are over utlized as you go.  CPU ready is a good one along with co-stop time.  Also the CPU load average at the top of the ESXTOP screen is also very good at looking at your vCPU / core limits.

ESXTOP - Yellow Bricks

Hope this has helped

[antonmajor · Accepted solution]

Workload Type/ Number of vCPUs per ESXi host CPU core / Most common VM vCPU to ESXi host CPU core

• Business/Mission critical workload that are sensitive to latency / 1:1 /1:1
• Computation-intensive workload / 1:1 to 3:1 / 2:1
• Server production workload / 2:1 to 6:1 / 3:1
• Mixed server environment / 4:1 to 10:1 / 5:1
• Desktop environment / 1:1 to 18:1 / 6:1