The Vmware Paravirtualized SCSI controller seems to be a very interesting feature. I am however wondering what your opinions are for the performance improvements compared to the LSI Logic adapter? If any performance gains, are there noticable as in better disk IO for the VM or for lower CPU usage on the host?
http://kb.vmware.com/kb/1017652
I guess the question is if you want to go through the effort of changing all of them. So only if you drive a large amount of IOs I would say you will benefit from the pvscsi adapter. Although it will not hurt your performance with vSphere 4.1 the question is if you gain any.
Duncan (VCDX)
Available now on Amazon: vSphere 4.1 HA and DRS technical deepdive
Thanks a lot for your answer Duncan. What I am really curious about is whether a change from LSI Logic to PVSCSI on a high-IO VM is noticable? And mostly, will the VM see any difference? If CPU cycles on the host is saved that is good, but will the VM typical see performance benefits?
Are there any public opinion about performance gains between LSI and PVSCSI? I think PVSCSI are very interesting and a bit cool.. and it would be very interesting to know if it is a general recommendation for high IO VMs and what the results are in production?
I keep thinking that at some point moving to PVSCSI was going to be the recommendation for al VMs regardless of IO requirements.