Q1. File Size, Transmission Speed, and Transmission Time: A Case Study Cloud 9,
ID: 3757199 • Letter: Q
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Q1. File Size, Transmission Speed, and Transmission Time: A Case Study Cloud 9, a cloud storage service provider based in San Diego, has just announced that it s running out of money and will be shutting down operations soon. It has given all its clients fifteen (15) days to move their data out, either back to their own facility or to an alternative service provider. Founded six years ago, Cloud 9 has since acquired 600 business clients, who use Cloud 9 infrastructure to store archived data. Among these clients, a few are large companies with several terabytes (TB) of data archived at Cloud 9, but on average each client company stores about 300 Gigabytes (GB) of data on Cloud 9's disk drives. Cloud 9's connection to the Internet is a Gigabit Ethernet line that has an effective aggregate transmission rate of 900 Mbps (900,000,000 bits per second). make your calculations easier, a few assumptions have been made as follows: I. Cloud 9's Internet connection will be available 24 x 7 before the 15-day shutdown 2. 3. 4. 1 GB-1,024 Bytes 1,073,741,824 Bytes deadline Even if new funding could be arranged, there would be no time to add additional transmission lines to Cloud 9's facility before the deadline. For regulatory compliance reasons, Cloud 9's clients cannot afford to lose their archived data, but none of them has a secondary backup copy of the data. Questions: a. If all of Cloud 9's clients start moving their data out at the beginning of the 15-day period y sharing Cloud 9's Internet connection, will there be enough time to move all the data out? Show your calculations. What alternatives do Cloud 9's clients have that will NOT involve the use of network circuits? b.Explanation / Answer
ANSWER :
a.)
Total Number of Clients = 600 clients.
Average data stored by each client = 300 GB.
Total Data stored by clients = 600 * 300 GB = 180,000 GB
Transmission Rate of the line = 900 Mbps = 900,000,000 bits/sec.
Lets convert the data into bits
=
180,000 * 1,073,741,824 bytes = 180,000 * 1,073,741,824 * 8 bits.
Number of seconds it will take to transfer is
= data / speed
(180,000 * 1,073,741,824 * 8 ) / 900,000,000 sec
Each day we have = 24 hours * 60 mins * 60 secs = 86,400 sec
Number of days it will take for the data transfer
=
(180,000 * 1,073,741,824 * 8 ) / (900,000,000 * 86,400 ) days
= 19.884 days
Since 19.884 days > 15 days , there will not be enough time for the data move/ transfer.
b)
database backup of data. usb backup of data etc are some of the options which doesn't involve network.
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