Comments for BRAD HEDLUND

Comment on Cisco UCS Networking videos (in HD), Updated & Improved! by george

george — Tue, 18 Jun 2013 23:15:22 +0000

Hi Brad,

These videos are awesome………….I watch it over and over and over again………Thank you so much!!

Cheers

George

Comment on Cisco UCS Networking videos (in HD), Updated & Improved! by Brad Hedlund

Brad Hedlund — Tue, 18 Jun 2013 17:11:59 +0000

Sara,
There is a virtual cable built between the vEth on the FI and the vNIC on the server adapter.

Comment on Cisco UCS Networking videos (in HD), Updated & Improved! by Sara

Sara — Tue, 18 Jun 2013 14:24:50 +0000

Hi Brad,
Excellent job!!!! These are greate videos!!!
I have a question about the vNIC identifiers in the videos. On most slides various servers have the same vNIC identifier for example in video Part 7a – End Host mode Pinning all servers have vNIC0. Is this correct or should different servers have different vNIC “names”. I mean, how does the FI now which vEth belongs to which vNIC?
Thanks in advance,
Sara

Comment on What is Network Virtualization? by Peter Phaal

Peter Phaal — Mon, 17 Jun 2013 15:24:40 +0000

I agree with Steven, providing performance guarantees requires integrated visibility and control of physical and virtual network resources through some form of SDN.

I recently published a DDoS case study that demonstrates the need for performance isolation in multi-tenant virtualized networks.

http://blog.sflow.com/2013/06/multi-tenant-performance-isolation.html

Comment on Understanding Hadoop Clusters and the Network by Sergio

Sergio — Mon, 17 Jun 2013 10:21:27 +0000

Excellent beginning for Hadoop. Thanks for your publication.

Comment on What is Network Virtualization? by Lennie

Lennie — Sun, 16 Jun 2013 09:17:03 +0000

So I was thinking about this capacity planning problem.

What if you let the (network-)scheduler set a limit at the virtualswitch on how much bandwidth a VM/vNIC is allowed to consume.

Or even notify the virtualswitch that there is less capacity now then before.

Then you can use flowcontrol. That is the proper way to deal with this, right ?

I know PAUSE-frames probably don’t have the best rep in the business, but you can always try an old idea at a different level.

Now I don’t know if a vNIC (driver) supports PAUSE-frames.

Or maybe set it at the hypervisor level, maybe the hypervisor can slow down forwarding packets.

Comment on Understanding Hadoop Clusters and the Network by Sai Praveen

Sai Praveen — Thu, 13 Jun 2013 11:07:59 +0000

One of the best articles on hadoop.

Comment on Understanding Hadoop Clusters and the Network by Debajit

Debajit — Thu, 13 Jun 2013 09:51:22 +0000

Ultimate explanation in a very simple english

Comment on Understanding Hadoop Clusters and the Network by Rahul

Rahul — Thu, 13 Jun 2013 03:15:01 +0000

Thanks Brad!!!! That’s a great article for a heads up! I have just started with Hadoop and was wondering what would be the replication policy in case the dfs.replication paramter is set to 4 (or more)!!!

Thanks for answers in advance

Comment on Understanding Hadoop Clusters and the Network by Manish

Manish — Wed, 12 Jun 2013 15:28:06 +0000

Excellent Write Up. Thank you very much