HA 可用性表格

博主： tl.s
发布时间：2024 年 12 月 14 日
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分类：技术笔记

Availability %	Downtime per year	Downtime per quarter	Downtime per month	Downtime per week	Downtime per day (24 hours)
90% ("one nine")	36.53 days	9.13 days	73.05 hours	16.80 hours	2.40 hours
95% ("one nine five")	18.26 days	4.56 days	36.53 hours	8.40 hours	1.20 hours
97% ("one nine seven")	10.96 days	2.74 days	21.92 hours	5.04 hours	43.20 minutes
98% ("one nine eight")	7.31 days	43.86 hours	14.61 hours	3.36 hours	28.80 minutes
99% ("two nines")	3.65 days	21.9 hours	7.31 hours	1.68 hours	14.40 minutes
99.5% ("two nines five")	1.83 days	10.98 hours	3.65 hours	50.40 minutes	7.20 minutes
99.8% ("two nines eight")	17.53 hours	4.38 hours	87.66 minutes	20.16 minutes	2.88 minutes
99.9% ("three nines")	8.77 hours	2.19 hours	43.83 minutes	10.08 minutes	1.44 minutes
99.95% ("three nines five")	4.38 hours	65.7 minutes	21.92 minutes	5.04 minutes	43.20 seconds
99.99% ("four nines")	52.60 minutes	13.15 minutes	4.38 minutes	1.01 minutes	8.64 seconds
99.995% ("four nines five")	26.30 minutes	6.57 minutes	2.19 minutes	30.24 seconds	4.32 seconds
99.999% ("five nines")	5.26 minutes	1.31 minutes	26.30 seconds	6.05 seconds	864.00 milliseconds
99.9999% ("six nines")	31.56 seconds	7.89 seconds	2.63 seconds	604.80 milliseconds	86.40 milliseconds
99.99999% ("seven nines")	3.16 seconds	0.79 seconds	262.98 milliseconds	60.48 milliseconds	8.64 milliseconds
99.999999% ("eight nines")	315.58 milliseconds	78.89 milliseconds	26.30 milliseconds	6.05 milliseconds	864.00 microseconds
99.9999999% ("nine nines")	31.56 milliseconds	7.89 milliseconds	2.63 milliseconds	604.80 microseconds	86.40 microseconds
99.99999999% ("ten nines")	3.16 milliseconds	788.40 microseconds	262.80 microseconds	60.48 microseconds	8.64 microseconds
99.999999999% ("eleven nines")	315.58 microseconds	78.84 microseconds	26.28 microseconds	6.05 microseconds	864.00 nanoseconds
99.9999999999% ("twelve nines")	31.56 microseconds	7.88 microseconds	2.63 microseconds	604.81 nanoseconds	86.40 nanoseconds

References

High availability - Wikipedia

最后修改：2024 年 12 月 14 日

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HA 可用性表格

tl.s • 2024 年 12 月 14 日

<table><thead><tr><th>Availability %</th><th>Downtime per year</th><th>Downtime per quarter</th><th>Downtime per month</th><th>Downtime per week</th><th>Downtime per day (24 hours)</th></tr></thead><tbody><tr><td>90% ("one nine")</td><td>36.53 days</td><td>9.13 days</td><td>73.05 hours</td><td>16.80 hours</td><td>2.40 hours</td></tr><tr><td>95% ("one nine five")</td><td>18.26 days</td><td>4.56 days</td><td>36.53 hours</td><td>8.40 hours</td><td>1.20 hours</td></tr><tr><td>97% ("one nine seven")</td><td>10.96 days</td><td>2.74 days</td><td>21.92 hours</td><td>5.04 hours</td><td>43.20 minutes</td></tr><tr><td>98% ("one nine eight")</td><td>7.31 days</td><td>43.86 hours</td><td>14.61 hours</td><td>3.36 hours</td><td>28.80 minutes</td></tr><tr><td>99% ("two nines")</td><td>3.65 days</td><td>21.9 hours</td><td>7.31 hours</td><td>1.68 hours</td><td>14.40 minutes</td></tr><tr><td>99.5% ("two nines five")</td><td>1.83 days</td><td>10.98 hours</td><td>3.65 hours</td><td>50.40 minutes</td><td>7.20 minutes</td></tr><tr><td>99.8% ("two nines eight")</td><td>17.53 hours</td><td>4.38 hours</td><td>87.66 minutes</td><td>20.16 minutes</td><td>2.88 minutes</td></tr><tr><td>99.9% ("three nines")</td><td>8.77 hours</td><td>2.19 hours</td><td>43.83 minutes</td><td>10.08 minutes</td><td>1.44 minutes</td></tr><tr><td>99.95% ("three nines five")</td><td>4.38 hours</td><td>65.7 minutes</td><td>21.92 minutes</td><td>5.04 minutes</td><td>43.20 seconds</td></tr><tr><td>99.99% ("four nines")</td><td>52.60 minutes</td><td>13.15 minutes</td><td>4.38 minutes</td><td>1.01 minutes</td><td>8.64 seconds</td></tr><tr><td>99.995% ("four nines five")</td><td>26.30 minutes</td><td>6.57 minutes</td><td>2.19 minutes</td><td>30.24 seconds</td><td>4.32 seconds</td></tr><tr><td>99.999% ("five nines")</td><td>5.26 minutes</td><td>1.31 minutes</td><td>26.30 seconds</td><td>6.05 seconds</td><td>864.00 milliseconds</td></tr><tr><td>99.9999% ("six nines")</td><td>31.56 seconds</td><td>7.89 seconds</td><td>2.63 seconds</td><td>604.80 milliseconds</td><td>86.40 milliseconds</td></tr><tr><td>99.99999% ("seven nines")</td><td>3.16 seconds</td><td>0.79 seconds</td><td>262.98 milliseconds</td><td>60.48 milliseconds</td><td>8.64 milliseconds</td></tr><tr><td>99.999999% ("eight nines")</td><td>315.58 milliseconds</td><td>78.89 milliseconds</td><td>26.30 milliseconds</td><td>6.05 milliseconds</td><td>864.00 microseconds</td></tr><tr><td>99.9999999% ("nine nines")</td><td>31.56 milliseconds</td><td>7.89 milliseconds</td><td>2.63 milliseconds</td><td>604.80 microseconds</td><td>86.40 microseconds</td></tr><tr><td>99.99999999% ("ten nines")</td><td>3.16 milliseconds</td><td>788.40 microseconds</td><td>262.80 microseconds</td><td>60.48 microseconds</td><td>8.64 microseconds</td></tr><tr><td>99.999999999% ("eleven nines")</td><td>315.58 microseconds</td><td>78.84 microseconds</td><td>26.28 microseconds</td><td>6.05 microseconds</td><td>864.00 nanoseconds</td></tr><tr><td>99.9999999999% ("twelve nines")</td><td>31.56 microseconds</td><td>7.88 microseconds</td><td>2.63 microseconds</td><td>604.81 nanoseconds</td><td>86.40 nanoseconds</td></tr></tbody></table><h2>References</h2><ul><li><a href="https://frytea.com/go/aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvSGlnaF9hdmFpbGFiaWxpdHk" target="_blank" >High availability - Wikipedia</a></li></ul>