Solved

SAN CX300

Posted on 2011-02-15
11
634 Views
Last Modified: 2012-05-11
I have a SAN CX300 which has a 2GB backbone. Does that mean copying files between virtual machines whether they're on the same or different LUNS should be 2GB per minute? Our SAN is fibre channel.

Thanks
0
Comment
Question by:AGenMIS
  • 7
  • 4
11 Comments
 
LVL 5

Expert Comment

by:ianmellor
ID: 34898925
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,
0
 

Author Comment

by:AGenMIS
ID: 34899021
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
0
 
LVL 5

Accepted Solution

by:
ianmellor earned 500 total points
ID: 34899090
Hi,

They are on different hosts so they will copy at the network speed. The 2Gb is the speed that your HBA's have access to the storage. It has 2Gb bandwidth to access the disc, I/O requests. That is not your network connection.

Cheers,
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 5

Expert Comment

by:ianmellor
ID: 34899114
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.
0
 

Author Comment

by:AGenMIS
ID: 34899804
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
0
 
LVL 5

Assisted Solution

by:ianmellor
ianmellor earned 500 total points
ID: 34900167
Hi,

In a way yes. It only affects disk access speed, if you have slow disk SATA and a 2Gb connection that would be slower than 15K SAS with a 2Gb link. Having a quicker link only gives you more capacity to your disks, more IOPS.

Cheers,
0
 

Author Comment

by:AGenMIS
ID: 34900794
In short, having a quicker link only gives you more IOPS on the virtual machines?
0
 
LVL 5

Expert Comment

by:ianmellor
ID: 34900885
Yes, but it is not the only factor.
0
 

Author Comment

by:AGenMIS
ID: 34900942
Do you have any documentation that explains all of this?

Thanks
0
 
LVL 5

Expert Comment

by:ianmellor
ID: 34901026
Documentation on how vm's communicate with the network of SAN technologies?
0
 
LVL 5

Expert Comment

by:ianmellor
ID: 34904841
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,

0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When converting a physical machine to a virtual machine using VMware vCenter Converter Standalone or vCenter Converter Enterprise, if an adapter type is not selected during the initial customization the resulting virtual machine may contain an IDE d…
Last article we focus in how to VMware: How to create and use VMs TAGs – Part 1 so before follow this article and perform the next tasks, you should read the first article how to create the TAG before using them in Veeam Backup Jobs.
Teach the user how to configure vSphere clusters to support the VMware FT feature Open vSphere Web Client: Verify vSphere HA is enabled: Verify netowrking for vMotion and FT Logging is in place or create it: Turn On FT for a virtual machine: Verify …
This video shows you how to use a vSphere client to connect to your ESX host as the root user. Demonstrates the basic connection of bypassing certification set up. Demonstrates how to access the traditional view to begin managing your virtual mac…

785 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question