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Posted by Didier Van Hoye on April 24, 2018
SMB Direct – The State of RDMA for use with SMB 3 traffic (Part III)

The RDMA wars in regards to SMB Direct: RoCE versus iWarp.

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Posted by Didier Van Hoye on April 17, 2018
SMB Direct – The State of RDMA for use with SMB 3 traffic (Part II)

The Flavors of RDMA & what role DCB plays.

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Posted by Didier Van Hoye on April 12, 2018
SMB Direct – The State of RDMA for use with SMB 3 traffic (Part I)

What is RDMA and why do we like it.

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Posted by Didier Van Hoye on October 12, 2017
SMB Direct in a Windows Server 2016 Virtual Machine Experiment

Ever since Windows Server 2012 we have SMB Direct capabilities in the OS and Windows Server 2012 R2 added more use cases such as live migration for example. In Windows Server 2016, even more, workloads leverage SMB Direct, such as S2D and Storage Replication. SMB Direct leverages the RDMA capabilities of a NIC which delivers high throughput at low latency combined with CPU offloading to the NIC. The latter save CPU cycles for the other workloads on the hosts such as virtual machines.

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Posted by Didier Van Hoye on September 27, 2017
The importance of IeeePriorityTag with converged RDMA Switch Embedded Teaming

If you read my blog on Switch Embedded Teaming with RDMA (for SMB Direct) you’ll notice that I set the -IeeePriorityTag to “On” on the vNICs that use DCB for QoS. This requires some explanation. When you configure a Switch Embedded Teaming (SET) vSwitch and define one or more management OS vNICs on which you enable RDMA you will see that the SMB Direct traffic gets it priority tag set correctly. This always happens no matter what you set the -IeeePriorityTag option to. On or Off, it doesn’t make a difference. It works out of the box.

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Posted by Didier Van Hoye on June 2, 2017
Why do we always see Responder CQE Errors with RoCE RDMA?

Anyone who has configured and used SMB Direct with RoCE RDMA Mellanox cards appreciates the excellent diagnostic counters Mellanox provides for use with Windows Performance Monitor. They are instrumental when it comes to finding issues and verifying everything is working correctly.

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Posted by Didier Van Hoye on August 25, 2016
Don’t Fear but Respect Redirected IO with Shared VHDX

Introduction

When we got Shared VHDX in Windows Server 2012 R2 we were quite pleased as it opened up the road to guest clustering (Failover clustering in virtual machines) without needing to break through the virtualization layer with iSCSI or virtual Fibre Channel (vFC).

First of all, you need to be aware of the limits of using a shared VHDX in Windows Server 2012 R2.

  1. You cannot perform storage live migration
  2. You cannot resize the VHDX online
  3. You cannot do host based backups (i.e. you need to do in guest backups)
  4. No support for checkpoints
  5. No support for Hyper-V Replica

If you cannot live with these, that’s a good indicator this is not for you. But if you can, you should also take care of the potential redirected IO impact that can and will occur. This doesn’t mean it won’t work for you, but you need to know about it, design and build for it and test it realistically for your real life workloads.

active guest cluster node is running on the Hyper-V host

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Posted by Didier Van Hoye on August 19, 2016
Musings on Windows Server Converged Networking & Storage

Why you should learn about SMB Direct, RDMA & lossless Ethernet for both networking & storage solutions

fully converged Hyper-V Qos Courtesy of Microsoft

Server, Hypervisor, Storage

Too many people still perceive Windows Server as “just” an operating system (OS). It’s so much more. It’s an OS, a hypervisor, a storage platform with a highly capable networking stack. Both virtualization and cloud computing are driving the convergence of all the above these roles forward fast, with intent and purpose. We’ll position the technologies & designs that convergence requires and look at the implications of these for a better overall understanding of this trend.
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