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From the virtual machine side, set the disk type to be independent/persistent, that way, all the changes are permanently and immediately written to the disk.<br />
<br />
If you want to disable it inside the guest, you need to modify your .vmx file and probably reboot the guest too:<br />
<br />
diskLib.dataCacheMaxSize = &quot;0&quot; 
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From the virtual machine side, set the disk type to be independent/persistent, that way, all the changes are permanently and immediately written to the disk.

If you want to disable it inside the guest, you need to modify your .vmx file and probably reboot the guest too:

diskLib.dataCacheMaxSize = "0"

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I added this line to the VM config (vmx) file and restarted the VM.<br />
But when I check the &quot;Policies&quot; tab of the disk properties. The option is still set to &quot;Optimize for performance&quot;......which should mean: write cache enabled...<br />
<br />
Is this ok?!
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I added this line to the VM config (vmx) file and restarted the VM.
But when I check the "Policies" tab of the disk properties. The option is still set to "Optimize for performance"......which should mean: write cache enabled...

Is this ok?!

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Thanks for your quick response / help !
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I have a virtual machine (W2K3 SP2 + SQL server) running on an ESX 2.54 host. I want to disable the write cache on the disk which contains the SQL database.<br />
The option which I normally use in the Windows OS is set to &quot;Optimize for performance&quot; and is grayed out to prevent change. <br />
How can I disable the write cache.<br />
<br />
Any help is very much appriciated!<br />
<br />
Rob
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I have a virtual machine (W2K3 SP2 + SQL server) running on an ESX 2.54 host. I want to disable the write cache on the disk which contains the SQL database.
The option which I normally use in the Windows OS is set to "Optimize for performance" and is grayed out to prevent change. 
How can I disable the write cache.

Any help is very much appriciated!

Rob

Disable write cache on ESX 2.5 virtual machine

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.