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*停權中*
加入日期: Mar 2012
文章: 161
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關於儲存設備容量需求的計算問題
各位學長：
底下這題是個計算題： An application uses 20, 10 GB devices. A pointer-based full volume replica of the application is required every 6 hours. Each replica will be kept for 24 hours. The data changes by 10% every 4 hours. How many replica devices are required? 我是這樣想的： (10*20/6*24*(1.1)^6)/10=141.724, ---142 可是答案是80。不曉得哪裡錯了，再請學長們指導，萬分感謝!! |
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2012-08-13, 11:21 AM
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Major Member
 加入日期: Dec 2005
文章: 151
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A pointer-based full volume replica of the application is required every 6 hours.
重點只在這一句，100%複製。 24/6 * 20=80 打完收工。 |
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2012-08-13, 01:18 PM
#2
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*停權中*
加入日期: Mar 2012
文章: 161
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引用:
學長真是了不起，豁然開朗，心情愉快!! 能不能再請教一題？感謝!! A department within an organization requires 200 GB of storage for their business application. The production LUN is RAID 1+0 protected and has a local and remote replica. The local replica is on a RAID 1 LUN and the remote replica is on a five-disk RAID 5 LUN. If the cost per GB of storage is $2.00, what is the chargeback cost to the department for application storage? 答案是$2100，完全無法理解>< |
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2012-08-13, 02:35 PM
#3
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Junior Member
  
加入日期: May 2005 您的住址: Autobahn, Deutschland
文章: 743
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RAID 0+1 -> (100+100)x2 = 400G
RAID 1 -> 200x2 = 400G RAID 5 -> 200x5/(5-1) = 250G (400+400+250)x2= 2100 引用:
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2012-08-13, 02:45 PM
#4
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