Knowledge base
How to change SCSI controller type
Posted by Marcin Achler on 17.11.2016 17:24

In the Admin Panel you can change type of SCSI controller from default LSI SAS to PVSCSI (Paravirtual SCSI). An instance should be turned off while changing this option otherwise user will be asked to restart it.

PVSCSI and LSI Logic Parallel/SAS are essentially the same when it comes to overall performance capability.  PVSCSI, however, is more efficient in the number of host compute cycles that are required to process the same number of IOPS. It means that if you have a very storage IO intensive virtual machine (over 80 thousands IOPS), this is the controller to choose to ensure you achieve better performance and higher maximum IOPS results for Tier-3,Tier-4 and Tier-5 disks in accordance with the nominal specification.

Most modern operating systems and processors can drive high IO support one of these two controllers, but note that using PVSCSI controller in enviroment that is not so much IO intensive (up to 80 thousands IOPS) may result in higher latency. Moreover choosing PVSCSI is also associated with certain limitations described in the Vmware documentation. We strongly recommend to read this article before planned modification and to test new setting on a cloned machine.

To change the type of controller in the Administration Panel you should select "SCSI Controller Type" and set the adequate controller.

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