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Re: [Raw] FW: New Version Notification for draft-pthubert-raw-architecture-00.txt

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Thu, 02 April 2020 14:06 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Rex Buddenberg <buddenbergr@gmail.com>, "raw@ietf.org" <raw@ietf.org>
CC: CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>, Fabrice Theoleyre <theoleyre@unistra.fr>
Thread-Topic: [Raw] FW: New Version Notification for draft-pthubert-raw-architecture-00.txt
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Date: Thu, 02 Apr 2020 14:03:50 +0000
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Subject: Re: [Raw] FW: New Version Notification for draft-pthubert-raw-architecture-00.txt
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Dear RAWers,

The Industrial people I've been discussing with tell me that they want 5 nines of reliability (PDR=99.999%) because if the faults are independent, then there are 10 nines that we have 2 faults in a row, and 15 nines that you get three.

What they really want is to avoid faults in a row. Because after 4 packet losses, the control loop is unstable and the production line is emergency halted. Once a year you get a bad look. Twice and your equipment is on the curb.

You see that the nines of reliability actually translate in an unscheduled loss of availability that is less than 4 loops. Because we cannot repair that fast, we need redundancy is a requirement.

In the architecture I used the following definition:

   Reliability:  Reliability is a measure of the probability that an
      item will perform its intended function for a specified interval
      under stated conditions.  For RAW, the service that is expected is
      delivery within a bounded latency and a failure is when the packet
      is either lost or delivered too late.  RAW expresses reliability
      in terms of Mean Time Between Failure (MTBF) and Maximum
      Consecutive Failures (MCF).

   Availability:  Availability is a measure of the relative amount of
      time where a path operates in stated condition, in other words
      (uptime)/(uptime+downtime).  Because a serial wireless path may
      not be good enough to provide the required availability, and even
      2 parallel paths may not be over a longer period of time, the RAW
      availability implies a path that is a lot more complex than what
      DetNet typically envisages (a Track).

(feedback welcome!)

Certainly the ratio of usable time is of interest. If it's scheduled and you can coordinate other maintenance activities then it can last longer. But the losses in a row are the real criterion on which automation operates; the reliable cross-over that Rex tells us about must happen within that time.

Keep safe,

Pascal

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