Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

SAN CX300

Posted on 2011-02-15
11
Medium Priority
?
661 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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 2000 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
Ransomware: The New Cyber Threat & How to Stop It

This infographic explains ransomware, type of malware that blocks access to your files or your systems and holds them hostage until a ransom is paid. It also examines the different types of ransomware and explains what you can do to thwart this sinister online threat.  

 
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 2000 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

The Eight Noble Truths of Backup and Recovery

How can IT departments tackle the challenges of a Big Data world? This white paper provides a roadmap to success and helps companies ensure that all their data is safe and secure, no matter if it resides on-premise with physical or virtual machines or in the cloud.

Question has a verified solution.

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

Each year, investment in cloud platforms grows more than 20% (https://www.immun.io/hubfs/Immunio_2016/Content/Marketing/Cloud-Security-Report-2016.pdf?submissionGuid=a8d80a00-6fee-4b85-81db-a4e28f681762) as an increasing number of companies begin to…
This article outlines why you need to choose a backup solution that protects your entire environment – including your VMware ESXi and Microsoft Hyper-V virtualization hosts – not just your virtual machines.
Teach the user how to edit .vmx files to add advanced configuration options Open vSphere Web Client: Edit Settings for a VM: Choose VM Options -> Advanced: Add Configuration Parameters:
This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …

721 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