VMware – limiting VM IOPs

Storage performance is the new bottleneck for VM performance.  In VMware vSphere, you can actually limit disk I/O on a per VM basis.  The setting can be found by powering off a VM, right-clicking the VM in the vSphere Client Inventory, selecting “Edit Settings”.  Click the Resources tab and then select Disk.  This is where you will find the “Limit – IOPs” setting.

There is one caveat though, “combined total” only goes for the disks which are stored on the same datastore. So if you have 4 disks and they are stored across 4 datastores then each of the individual limits apply respectively.

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