<div dir="ltr">Thank you for the response Roland. <div><br></div><div>I will start going through the source code. In the meantime, it will be great if these preliminary questions can be answered. <div><br></div><div>Q: Is Protocol C a variant of any standard atomic commit protocol (like 2PC/3PC etc.)? Or is it a proprietary algorithm? </div><div>Q: Let's assume there are 2 disks (D1, D2). Let's assume that D2 is experiencing a fail-recover situation, but D1 has failed after a D2 failure, but before D2 has recovered. What is the behavior of DRBD in such a case? Are all future disk writes blocked until both D1 and D2 are available, and are confirmed to be in sync? </div><div><br></div><div>Regards,</div><div>Ravi.</div><div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Sep 8, 2017 at 2:07 AM, Roland Kammerer <span dir="ltr"><<a href="mailto:roland.kammerer@linbit.com" target="_blank">roland.kammerer@linbit.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Thu, Sep 07, 2017 at 04:08:10PM -0700, Ravi Kiran Chilakapati wrote:<br>
> Hi,<br>
><br>
> I was wondering where I could find more information on DRBD's Protocol C? I<br>
> was hoping I could find a resource without resorting to the source code.<br>
><br>
> I tried the following with no luck.<br>
> 1) asking around on Stackoverflow (<br>
> <a href="https://stackoverflow.com/questions/45998076/an-explanation-of-drbd-protocol-c" rel="noreferrer" target="_blank">https://stackoverflow.com/<wbr>questions/45998076/an-<wbr>explanation-of-drbd-protocol-c</a><br>
> )<br>
> 2) scanning the user guide (<a href="http://docs.linbit.com/docs/users-guide-9.0/" rel="noreferrer" target="_blank">http://docs.linbit.com/docs/<wbr>users-guide-9.0/</a>)<br>
<br>
</span>There is no official "user-friendly" documentation besides the UG. So<br>
ask specific questions and we can answer them (and probably add them to<br>
the UG in some high level section) or read the code...<br>
<br>
Regards, rck<br>
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