The default heap size for VMFS-3 is set to 16Mb. This allows for a maximum of 4Tb of open virtual disk capacity on a single ESX host.
In ESX 3.0, the value cannot be adjusted. VMware is considering a patch to correct the issue.
In ESX 3.5, the value can be adjusted:
- Log in to the VirtualCenter or the ESX host using the Virtual Infrastructure Client. If connecting to VirtualCenter, select the ESX host from the inventory.
- Select the Configuration tab.
- Select Advanced Settings.
- Select VMFS3.
- Update the field in VMFS3.MaxHeapSizeMB.
The maximum heap size is 128Mb. This allows a maximum of 32Tb of open storage.
Applies to: VMware ESX 3.x