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Premature Storage Heap Exhaustion Might Occur on ESX Server Hosts with More than 32 Core Physical CPUs (1002822)


For an ESX Server host that has multiple core physical CPUs, usually more than 32, the default storage heap size of 20MB is not enough. As a result, the performance of such a host might decrease, and it issues the Out of Memory warning.


To resolve this issue, you need to increase the default storage heap size for your ESX Server host.

Follow this procedure:

  1. Open the ESX Server /boot/grub/grub.conf file in a text editor.

  2. Locate the kernel line associated with the VMware ESX Server grub menu item.

  3. Add the storageHeapMaxSize string to the end of the line, typically after the mem=272M option, and specify the heap size in bytes, for example:


  4. Save the file and reboot the ESX Server host for the change to take effect.

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