lsi sas to pvscsi

[tdubb123]

I changed my scsi adapter from lsi sas to pvscsi but then the 2012 server will not boot. What is the process to changed the adapter? Is there a big performance benefit to go from lsi sas to pvscsi?

thanks

[marcelo_soares]

To configure pvscsi with windows 2012, you need to first install the pvscsi driver, as per kb http://kb.vmware.com/kb/1010398 (refer to the section "To configure an existing Windows boot disk to use a PVSCSI adapter")

The pvscsi controller should have a better performance as it exposes the virtualization layer to the OS.

[tdubb123]

Thanks. Would you say pvscsi performs better on a virtual disk or would rdm still be better?

[marcelo_soares · Accepted solution]

RDM will always have less overhead than VMDK. This may not always translate in a better performance. In this case, you should really perform some tests to decide what will be the best combination/choice for your specific VMs. But, yes, RMDs with pvscsi should have the best performance of all scenarios.

[marcelo_soares]

Let us know if everything went good, and also mark the Q as answered, if possible award points for helpful and/or correct answers.

[tdubb123]

Thanks Marcelo. you have answered my questions.