Solved

1Gb/s Fibre Channel throughput vs Gigabit Ethernet throughput

Posted on 2004-10-08
10
3,741 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
10 Comments
 
LVL 95

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
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.

 
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

VMware Disaster Recovery and Data Protection

In this expert guide, you’ll learn about the components of a Modern Data Center. You will use cases for the value-added capabilities of Veeam®, including combining backup and replication for VMware disaster recovery and using replication for data center migration.

Question has a verified solution.

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

When we purchase storage, we typically are advertised storage of 500GB, 1TB, 2TB and so on. However, when you actually install it into your computer, your 500GB HDD will actually show up as 465GB. Why? It has to do with the way people and computers…
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…
To efficiently enable the rotation of USB drives for backups, storage pools need to be created. This way no matter which USB drive is installed, the backups will successfully write without any administrative intervention. Multiple USB devices need t…
This tutorial will walk an individual through setting the global and backup job media overwrite and protection periods in Backup Exec 2012. Log onto the Backup Exec Central Administration Server. Examine the services. If all or most of them are stop…

803 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