FCoE: Framing deep dive

My current series of posts on FCoE and CEE have generated a lot of questions and feedback via the comments section and on Twitter.  In this post I will attempt to address some of the questions and misunderstandings – especially around encapsulation and framing efficiency……I received a comment on the site today from a confused reader.  The point of confusion is a common one and not something to be embarrassed about.  Part of the comment read as follows “…..but it’s [FCoE] problem is that it consists of 3 different protocols (IP, FC, SCSI) just enlarging it’s frame size…

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FCoE: Framing deep dive

My current series of posts on FCoE and CEE have generated a lot of questions and feedback via the comments section and on Twitter.  In this post I will attempt to address some of the questions and misunderstandings – especially around encapsulation and framing efficiency……I received a comment on the site today from a confused reader.  The point of confusion is a common one and not something to be embarrassed about.  Part of the comment read as follows “…..but it’s [FCoE] problem is that it consists of 3 different protocols (IP, FC, SCSI) just enlarging it’s frame size…

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Why HP should buy Brocade

One of the rumours doing the rounds today is that Brocade are apparently up for sale or at least considering the possibility - I stress at the moment of writing this that it is pure speculation.  Clearly rumours like this must be taken with a bucket of salt and are often either blatantly untrue and sometimes calculated in their nature.Anyway, the interesting thing from my point of view is that it was just last week that I cheekily said to somebody at HP, via email, that I thought HP should buy Brocade.  So with the current rumour in mind…

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Why HP should buy Brocade

One of the rumours doing the rounds today is that Brocade are apparently up for sale or at least considering the possibility - I stress at the moment of writing this that it is pure speculation.  Clearly rumours like this must be taken with a bucket of salt and are often either blatantly untrue and sometimes calculated in their nature.Anyway, the interesting thing from my point of view is that it was just last week that I cheekily said to somebody at HP, via email, that I thought HP should buy Brocade.  So with the current rumour in mind…

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FCoE: Unovering the CNA - Deep Dive

Continuing with my current theme of Fibre Channel over Ethernet, and at the request of several people, this post will take a close look at Converged Network Adapters (CNA). Now then, there is no easy way to put this, but to do justice to a topic like this will require a lot of words.  I’ll do my best to keep it succinct, but if you are looking for a high level overview in under 1,000 words then this is probably for you, but thanks for stopping by………  However, if you want a deep dive and opportunity for technical…

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FCoE: Unovering the CNA - Deep Dive

Continuing with my current theme of Fibre Channel over Ethernet, and at the request of several people, this post will take a close look at Converged Network Adapters (CNA). Now then, there is no easy way to put this, but to do justice to a topic like this will require a lot of words.  I’ll do my best to keep it succinct, but if you are looking for a high level overview in under 1,000 words then this is probably for you, but thanks for stopping by………  However, if you want a deep dive and opportunity for technical…

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FC: recapping FC flow control

Amid all the discussion of FCoE and the many requests to cover more aspects and underlying technologies, I thought it probably a good idea to take a step back for a moment and recap flow control in native FC networks.  After all, FCoE is almost a transplant of FCP onto Ethernet.Granted, to some people this will be teling you how to suck eggs, but for others clearly not!  So………. native FC Class 3 networks achieve reliable frame delivery/lossless behaviour through the use of a link layer flow control mechanism called buffer-to-buffer credits (aka BB_Credits)  NOTE:  Class 3,…

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FC: recapping FC flow control

Amid all the discussion of FCoE and the many requests to cover more aspects and underlying technologies, I thought it probably a good idea to take a step back for a moment and recap flow control in native FC networks.  After all, FCoE is almost a transplant of FCP onto Ethernet.Granted, to some people this will be teling you how to suck eggs, but for others clearly not!  So………. native FC Class 3 networks achieve reliable frame delivery/lossless behaviour through the use of a link layer flow control mechanism called buffer-to-buffer credits (aka BB_Credits)  NOTE:  Class 3,…

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