VMFS out of heap memory

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:

  1. 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.
  2. Select the Configuration tab.
  3. Select Advanced Settings.
  4. Select VMFS3.
  5. Update the field in VMFS3.MaxHeapSizeMB.

The maximum heap size is 128Mb. This allows a maximum of 32Tb of open storage.

http://kb.vmware.com/selfservice/search.do?cmd=displayKC&docType=kc&externalId=1004424&sliceId=1&docTypeID=DT_KB_1_1&dialogID=27670304&stateId=1%200%2027666758

Applies to: VMware ESX 3.x

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