VMDirectPath SCSI targets per virtual machine

[dirtdevil01]

I'm studying for the VCP4 cert (taking it tomarrow), specificly the maximums doc and I found this...

VMDirectPath SCSI targets per virtual machine     60

What are they talking about? VMDirectPathing an HBA? And if so why would it have a limited number of maximum targets then a non-VMDirectPathed HBA?

[Virtualinfra]

You should gothropugh config max once again.

Virtual SCSI Tragets per VM is 60 and VMDirectPath PCi/PCIe evice per VIrtul machine is 4 refer below doc.

http://www.vmware.com/pdf/vsphere4/r41/vsp_41_config_max.pdf

Storage Virtual Adapters and Devices

Virtual SCSI adapters per virtual machine 4

1

Virtual SCSI targets per virtual SCSI adapter 15

2

Virtual SCSI targets per virtual machine 60

VMDirectPath limits

VMDirectPath PCI/PCIe devices per host 8

VMDirectPath PCI/PCIe devices per virtual machine 4

Advantage of VMDirect Path:

VMDirectPath allows guest operating systems to directly access an I/O device, bypassing the virtualization

layer. This direct path, or passthrough can improve performance for VMware ESX™ systems that utilize

high‐speed I/O devices, such as 10 Gigabit Ethernet

Why is the limited number?

Its is developed to support only limited number.. the limited number specified is 100 times more then what we use in the environment on a virtual machine or a physical machine,

[mobcdi]

Hi I'm a bit confused about the maximum values as well

I was reading this kb about vmdirectpath http://kb.vmware.com/kb/1010789  and it says you can have up to 2 pass throughs per vm?

Am I mixing up something obvious?

Seems 2 was the max in 4.0 and 4 is the new max in 4.1 http://communities.vmware.com/thread/320225?tstart=0

Message was edited by: mobcdi

[AndreTheGiant]

You must use this doc for the max:

http://www.vmware.com/pdf/vsphere4/r41/vsp_41_config_max.pdf

A KB could be old or refer to a old product.

PS: in any case don't worry... the actual exam seems to be a generic 4.x exam.

PS2: thread has been moved to VCP area.

Andre