Business System Consultation Center - Our Business System ColumnVol.107 2020.11.01 Takahashi Minoru

It's not 'work style reform' — it's 'how we make people work reform'

Thank you for your interest and continued support.
This is Takahashi from the Marketing Plan Research Laboratory.


"Our system has a proven 99% uptime!"
If you hear a sales pitch like this, I recommend asking for the calculation method behind it.


Example
(a) 24 hours per day × 365 days per year = 8,760 total hours per year
(b) Assume the total annual downtime is 84 hours (3.5 days)
(c) The uptime rate is 1 – (b) ÷ (a) = 99%


In the example above, 84 ÷ 12 months = an average of 7 hours of system downtime per month.
Depending on the calculation method, even a system boasting a 99.9% uptime rate could be deemed unacceptable.


It is also necessary to confirm the definition of what constitutes a system outage.
If the system is one that absolutely must not go down (i.e., for operations with no alternative means of operation),
it is important to know the estimated uptime—even if it’s just a rough estimate—before implementation.


That's all, Thank you for reading.

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