<div dir="ltr">Sounds good.<div><br></div><div>Have you created an etherpad page for collecting topics, Ifat?</div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Jan 16, 2017 at 10:43 PM Afek, Ifat (Nokia - IL) <<a href="mailto:ifat.afek@nokia.com">ifat.afek@nokia.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal gmail_msg" style="margin-left:36.0pt"><b class="gmail_msg"><span style="font-family:Calibri;color:black" class="gmail_msg">From:
</span></b><span style="font-family:Calibri;color:black" class="gmail_msg">Yujun Zhang <<a href="mailto:zhangyujun%2Bzte@gmail.com" class="gmail_msg" target="_blank">zhangyujun+zte@gmail.com</a>><br class="gmail_msg">
<b class="gmail_msg">Date: </b>Sunday, 15 January 2017 at 17:53<br class="gmail_msg">
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<p class="MsoNormal gmail_msg" style="margin-left:36.0pt">About fault and alarm, what I was thinking about the causal/deducing chain in root cause analysis.
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<p class="MsoNormal gmail_msg" style="margin-left:36.0pt">Fault state means the resource is not fully functional and it is evaluated by related indicators. There are alarms on events like power loss or measurands like CPU high, memory low, temperature high. There are
also alarms based on deduced state, such as "host fault", "instance fault".<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg" style="margin-left:36.0pt">So an example chain would be<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<u class="gmail_msg"></u><span style="font-size:10.0pt;font-family:Symbol" class="gmail_msg"><span class="gmail_msg">·<span style="font:7.0pt "Times New Roman"" class="gmail_msg">
</span></span></span><u class="gmail_msg"></u><span dir="LTR" class="gmail_msg"></span>"FAULT: power line cut off" =(monitor)=> "ALARM: host power loss" =(inspect)=> "FAULT: host is unavailable" =(action)=> "ALARM: host fault"<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<u class="gmail_msg"></u><span style="font-size:10.0pt;font-family:Symbol" class="gmail_msg"><span class="gmail_msg">·<span style="font:7.0pt "Times New Roman"" class="gmail_msg">
</span></span></span><u class="gmail_msg"></u><span dir="LTR" class="gmail_msg"></span>"FAULT: power line cut off" =(monitor)=> "ALARM: host power loss" =(inspect)=> "FAULT: host is unavailable" =(inspect)=> "FAULT: instance is unavailable" =(action)=> "ALARM: instance fault"<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg" style="margin-left:36.0pt">If we omit the resource, then we get the causal chain as it is in Vitrage<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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</span></span></span><u class="gmail_msg"></u><span dir="LTR" class="gmail_msg"></span>"ALARM: host power loss" =(causes)=> "ALARM: host fault"<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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</span></span></span><u class="gmail_msg"></u><span dir="LTR" class="gmail_msg"></span>"ALARM: host power loss" =(causes)=> "ALARM: instance fault"<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg" style="margin-left:36.0pt">But what the user care about might be there "FAULT: power line cut off" causes all these alarms. What I haven't made clear yet is the equivalence between fault and alarm.<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg" style="margin-left:36.0pt">I may have made it more complex with my
<b class="gmail_msg">immature</b> thoughts. It could be even more complex if we consider multiple upstream causes and downstream outcome. It may be an interesting topic to be discussed in design session.<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg">[Ifat] I agree. Let’s discuss this in the next design session we’ll have<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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