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According to VMware, there are two main reasons to deploy a virtual machine with the Paravirtual SCSI controller:

PVSCSI adapters are high-performance storage adapters that can result in greater throughput and lower CPU utilization. PVSCSI adapters are best for environments, especially SAN environments, where hardware or applications drive a very high amount of I/O throughput. The VMware PVSCSI adapter driver is also compatible with the Windows Storport storage driver. PVSCSI adapters are not suitable for DAS environments. VMware Paravirtual SCSI adapters are high-performance storage adapters that can result in greater throughput and lower CPU utilization.

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The PVSCSI adapter offers a significant reduction in CPU utilization as well as potentially increased throughput compared to the default virtual storage adapters, and is thus the best choice for environments with very I/O-intensive guest applications.

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Changing VMware Storage Controller to Paravirtual for CentOS 7

This tutorial contain step by step guidance to change the Virtual Storage Controller from LSI Logic Parallel (SCSI controller 0) to VMware Paravirtual for a CentOS 7 based Virtual Machine that is running on the ITS Private Cloud.

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vss-cli --wait compute vm set <name-or-vm-id> snapshot mk -d "lsi logic to paravirtual" -l 72
Info

More information Manage virtual machine snapshots.

  1. Power Off the virtual machine:

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vss-cli --wait compute vm set <vm-name-or-vm-id> state shutdown

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vss-cli --wait compute vm set <vm-name-or-vm-id> controller scsi mk --scsi paravirtual

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vss-cli --wait compute vm set <vm-name-or-vm-id> state on

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vss-cli --wait compute vm set <vm-name-or-vm-id> state shutdown

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vss-cli --wait compute vm set <vm-name-or-vm-id> controller scsi up -t paravirtual 0

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vss-cli --wait compute vm set <name-or-vm-id> controller scsi rm 1

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vss-cli --wait compute vm set <vm-name-or-vm-id> state on

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vss-cli --wait compute vm set <vm-name-or-vm-id> snapshot rm <snap-id>
Info

More information Manage virtual machine snapshots.

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Changing VMware Storage Controller to Paravirtual for Windows

This tutorial contain step by step guidance to change the Virtual Storage Controller from LSI Logic SAS (SCSI controller 0) to VMware Paravirtual for a Microsoft Windows Server 2016 or later (64-bit) based Virtual Machine running on the ITS Private Cloud

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Warning

Ensure machine is patched and latest VMware Tools installed and running.

If VMware Tools is ever removed from the system, it will not boot.

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vss-cli --wait compute vm set <name-or-vm-id> snapshot mk -d "lsi logic to paravirtual" -l 72
Info

More information Manage virtual machine snapshots.

  1. Shutdown/Power Off the virtual machine:

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vss-cli --wait compute vm set <vm-name-or-vm-id> state --cconfirm shutdown

  1. Add a temporary VMware Paravirtual Controller to the Virtual Machine.

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vss-cli --wait compute vm set <vm-name-or-vm-id> controller scsi mk --sscsi paravirtual

  1. Verify that a new SCSI controller has been created.

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vss-cli --wait compute vm set <vm-name-or-vm-id> state --confirm shutdown

  1. Update scsi controller 0 to type Paravirtual:

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vss-cli --wait compute vm set <vm-name-or-vm-id> controller scsi up -t paravirtual 0

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vss-cli --wait compute vm set <vm-name-or-vm-id> state --confirm shutdown

  1. Remove temporary SCSI controller

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vss-cli --wait compute vm set <vm-name-or-vm-id> snapshot rm <snap-id>
Info

More information Manage virtual machine snapshots.

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VMware KB 1010398

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Performance Best Practices for VMware vSphere 6.7

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Contributed by Joe Bate.

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