Technical Implementation(Storage) Flashcards
Explain the difference between disaster avoidance and disaster recovering
Avoidance - Methods to try to avoid the loss of data
Recovery - Methods use to get the data back after loss of data
Give an example of a disaster avoidance strategy?
Uninterrupted Power Supply
What is responsible for centralising distributed storage?
DDBMS (Distributed Database Management System)
Describe distributed storage
Distributed storage is when data is stored over more than one computer, the data is centralised using a DDBMS(Distributed Database Management System) which synchronises all data. All data is basically backed up instantaneously.
Give some advantages of distributed storage
<ul>
<li>More storage and more processing power than if it was just stored on one individual computer</li>
<li>Easy to expand</li>
<li>User has a fairly local version of database which will respond quickly to your request</li>
</ul>
Give an example of a company who uses distributed storage to store their data
Facebook, Amazon, Google
Describe Offline Storage
Offline storage is a method of storing data that is physically removed from the network. It cannot be accessed until physically connected to a network. It is often used to transport data. An example of offline storage is backup tapes.
Give an advantage and a disadvantage of offline storage compared to distributed storage
Advantages - Cheaper to store - More secure as no digital access Disadvantages - Harder to expand
Compare cloud technology to local servers in terms of
<ul>
<li>Cost</li>
</ul>
Cost - <strong>Cloud</strong> tends to have monthly fees, which relate to number of services and capacity of storage, cloud is more expensive short term
<strong>Local</strong> does not have subscription fees but they will need licensing fees initially to pay for software to (for example) manage email servers
Morgan is trying to store her company’s data. She has to decide whether to store it using cloud or local storage. In three months, Morgan’s business is expanding as they accommodate 200 new workers. What storage would you recommend Morgan purchasing?
It would be better to go for <em><strong>Cloud</strong></em> storage due to the fact it is easier to expand, she won’t have to worry about the technicalities, her business will just pay more and she will be able to expand her cloud storage capacity.
Jake has a small company and is looking to minimise his use of bandwidth to save the company money. He is looking for a storage solution, and is deciding between cloud and local. Which one would you recommend and why?
It would be better to go for <em><strong>Local </strong></em> because it requires less bandwidth. With cloud, there will be higher use of bandwidth due to constant uploading of data onto the cloud, so local would be the way forward for Jake.
Compare the installation costs of local vs cloud storage.
Cloud - Installation costs are not worried about, the cloud provider deals with that, the user just has to pay to subscribe to cloud storage.
Local - Costs for purchasing servers and the cost is likely to re-occur every 5 years as you replace servers
Describe a full backup and a disadvantage of this method of backing up files
A full backup is where all the data on a system is copied regardless of whether there has been any change or not. It is often stored on a different server or a digital magnetic tape.
Disadvantage:
<ul>
<li>Slow and requires lots of memory space</li>
</ul>
Describe the different between <em>differential</em> and <em> incremental </em> backups
Differential - type of backup method that saves any changes in the data since LAST FULL BACKUP
Incremental - type of backup method that saves any changes in data since BACKUP OF ANY KIND
Why are magnetic hard disks and solid state devices not often used for back-up?
Because normally large amounts of data is required to be copied and this would incur LARGE FEES if a magnetic hard disk or a solid state device was used
What does DAT and DLT stand for?
DAT - Digital Audio Tape
DLT - Digital Linear Tape