Solved

1Gb/s Fibre Channel throughput vs Gigabit Ethernet throughput

Posted on 2004-10-08
10
3,918 Views
Last Modified: 2013-11-15
Given 1 Gb/s Fibre Channel HBA vs an Gigabit Ethernet connection,
What would be faster in terms of throughput?
Any url links would be appreciated.  
FYI we are using Emulex LP8000 HBA cards  
0
Comment
Question by:rawalker58
[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
10 Comments
 
LVL 96

Expert Comment

by:Lee W, MVP
ID: 12260383
I would say the Fibre channel.  Because most network protocols have significant overhead that would lower the achieved data throughput.  Especially if your gig ethernet connection was copper and not fibre based.
0
 

Author Comment

by:rawalker58
ID: 12260949
Thank you for your reply. I believe this is correct as well. However I need data to back this up.
Do you know of any links or data to substantiate this?
0
 
LVL 1

Expert Comment

by:411monk
ID: 12264017
If your talking FC versus iSCSI, absoloutely FC is faster on a 1GB pipe.  1GB fiber and 1GB copper is the same througput, copper being limited by distance.  The protocol you run on the physical cabling will be the determining factor.  iSCSI inputs variables such as TOE cards and offloading processing that places it second to FC.
0
Three Reasons Why Backup is Strategic

Backup is strategic to your business because your data is strategic to your business. Without backup, your business will fail. This white paper explains why it is vital for you to design and immediately execute a backup strategy to protect 100 percent of your data.

 
LVL 16

Expert Comment

by:samccarthy
ID: 12268249
I would tend to agree with 411monk.  1gb Fiber and 1gb copper are the same in throughput, however the distance limitations are different.  When you are talking TCP/IP for example, once it gets down to the physical layer, it's the same anyway for fiber or copper.  So.......  Do you need the distance or to save some money.  If you want a cheap upgrade, Dell 24 port Gigabit switches run less than $400, so you can get a big bang for the buck with gigabit speed.

Steve
0
 
LVL 30

Accepted Solution

by:
Duncan Meyers earned 125 total points
ID: 12292802
FC real throughput is 100 MegaByte/sec (once you've taken out overheads etc) for the LP8000 (1Gb fibre attach). Gigabit ethernet is around 60-80 Megabytes per second. What is interesting though, is that an LP8000 on PCI bus connected to older storage will achieve 87MB/s write bandwidth and 85 MB/s read bandwidth. A QLogic QLA2340 (2Gb or 200MB/s card) achieves 130MB/s write and 190 MB/s read in a PCI bus. Put the same card in a PCI-X bus and that leaps to 194MB/s write and 190 MB/s read. You get similar figures for the Emulex LP9802.

What it all boils down to is that the limiting factor is the server itself.  It takes an enormous amount of CPU grunt to saturate the FC connection. In real world usage, you simply won't hit the bandwidth limitations of the FC interconnect. You'll hit CPU utilization, memory bandwidth or PCI bus limits first.

Having said all that I would always use FC in a SAN - even though it is more expensive than iSCSI or iFCP. You get a dedicated network for your storage that is designed for this application. And, as 411monk rightly points out, FC adapters do the protocol processing for you rather than offloading it to the CPU as in IP (some network cards excepted of course)
0
 
LVL 16

Expert Comment

by:samccarthy
ID: 12492648
I would ask for a share.  As all were good answers, I would recommend a split among the 4.
0
 
LVL 30

Expert Comment

by:Duncan Meyers
ID: 12520359
No opinion...
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

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

This article is an update and follow-up of my previous article:   Storage 101: common concepts in the IT enterprise storage This time, I expand on more frequently used storage concepts.
The question appears often enough, how do I transfer my data from my old server to the new server while preserving file shares, share permissions, and NTFS permisions.  Here are my tips for handling such a transfer.
This tutorial will walk an individual through locating and launching the BEUtility application to properly change the service account username and\or password in situation where it may be necessary or where the password has been inadvertently change…
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…

690 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