A Fibre Channel switch has eight ports and all ports must be operational from 8 AM to 8 PM, Monday through Friday. However, a failure of Port 2 occurs on a particular week as follows:
Monday = 10 AM to 12 PM
Wednesday = 4 PM to 9 PM
Thursday = 4 PM to 7 PM
Friday = 3 PM to 6 PM
Saturday = 9 AM to 1 PM
What is the availability of Port 2 in that week?
A. 70%
B. 71.6%
C. 78.3%
D. 80%
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D
Monday = 10 AM to 12 PM > 2hr
Wednesday = 4 PM to 9 PM > 5hr
Thursday = 4 PM to 7 PM > 3 hr
Friday = 3 PM to 6 PM > 3hr
Saturday (ignore)
Total downtime > 13 hr
availability = {(60-13)/60}*100= 78.3%
Small correction:
wed = 4PM to 8PM must be considered. Because the ports must be operational only 8AM – 8PM.
then,
Mon-2hr + Wed-4hr + Thur-3hr + Fri-3hr —> Downtime=12hrs
Availability= [(60-12)/60]*100 =80%
That makes opt D a correct answer:)
yes,
Me to the same result.
my answer is B
8 Am – 8 PM Monday to friday = 12 x 5 = 60 hours
total downtime = 17 hours
60 – 17 = 43
so 43/60 x 100 % = count yourself
not quite right bro..
here i corrected the answer for you
8 Am – 8 PM Monday to friday = 12 x 5 = 60 hours
total downtime = 13 hours (dont you count the saturday)
60 – 13 = 47
so 47/60 x 100 % = count yourself
i am the same person btw
its actually 83.3% Mon – Fri saturday is not included (10 hours down time) (60-10=50) divided by 60 total available is 83.3%
Information Availability = uptime / (uptime + downtime) = 48 / (48 + 12) = 0.8 = 80%
2+4+3+3=12
12*5=60
60-12=48
60:100%
48:x%
X=48*100/60 ===>80% answer is D
Why you counting 12hrs of downtime?
I count 18hrs:
Monday: 10AM – 12PM = 10 hours of downtime ( as uptime should be till 8PM)
Wed = 2
Thur = 3
Fri = 3
So its 18hours, so A with 70% is correct.
monday 10am-12pm is 2 hours. not 10
M-F, 8a-8p
2+4+3+3=12
12*5=60
60-12=48
60/(60+12)=0.8333
83.3%
48/60 not 60/72
I also get 80% but different logic. 12 hr operation window for 5 days is 60 hours. 12 hours of downtime during the operation window is 20% downtime or 80% availability.
For me is D, tot uptime 48h / (uptime +downtime) 60h = 80%