Paravirtual SCSI (PVSCSI) adapters Local Storage VS SAN

J
J used Ask the Experts™
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Hi,

According to the document :
https://kb.vmware.com/s/article/1010398

PVSCSI adapters are not suitable for DAS environments.
PVSCSI adapters are best for environments, especially SAN environments

If I setup a new server with Local Storage ex : SSD Drive RAID 10 setup and I created a VM with PVSCSI boot disk and data disk.

My questions :
Why it is not suitable for local storage ? I will not see any significant gain of performance ?

Any technical issue we might expect ?

Not suitable means not functional or not supported ?

Thanks,
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
This article includes supplemental information about configuring and using VMware Paravirtual SCSI (PVSCSI) adapters.
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.

Source
https://kb.vmware.com/s/article/1010398

You can try it, but it really depends on the workload in the VM, if you see any performance increase!

If there is a driver for the VM, it's supported. Whether it gives you the performance you require is only a matter of testing.
J

Author

Commented:
Hi,

I Agree with your comment but I still do not understand why VMware add a comment it’s not suitable for DAS and it’s more for SAN. I’m trying to understand why thoses comments are there especialy ?

What can be the issue with DAS?  Number of
VMs?

Thanks
VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
Performance and throughput. Also remember this VMware KB, may have never been updated.

We would recommend you test it and try it.

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