SAN CX300

Hi,

The copying of data depends on weather the vm's are on the same host and vSwitch. If the vm's are same vswitch they copy at the bus rate of the server. Other than that they will use the pNIC's. The 2Gb is the speed to the disks, the storage subsystem.

Hope this helps,

They are on the same vswitch but are on different host. If they are on the same host, will they copy data between each other faster?Also, can you elaborate more on the 2GB. I'm still confused on what the backbone speed references.

Thanks

Sorry, forgot to add, if they are on the same server they will copy faster. They won't use the network connection the copy happens in host memory.

Hope this helps.

The 2Gb is the speed the ESX host has to access storage on the SAN? So the 2Gb is irrelevant when it comes to copying files back and forth from VM to VM. If I had a CX500 the backbone would be 4 Gbps. What performance increase will I see with 4 Gbps instead of 2?

Thanks

In short, having a quicker link only gives you more IOPS on the virtual machines?

Yes, but it is not the only factor.

Do you have any documentation that explains all of this?

Thanks

Documentation on how vm's communicate with the network of SAN technologies?

Hi,

Here is the VMware SAN guide

http://www.vmware.com/pdf/vsphere4/r41/vsp_41_san_cfg.pdf

Here is the ESX configuration guide, look under network

http://www.vmware.com/pdf/vsphere4/r41/vsp_41_esx_server_config.pdf.

Hope I have explained myself clearly.

Cheers,