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NEW QUESTION: 1
Which RAID level concept is considered more expensive and is applied to servers to create what is commonly known as server fault tolerance?
A. RAID level 2
B. RAID level 0
C. RAID level 1
D. RAID level 5
Answer: C
Explanation:
RAID 1 (Mirroring) is usually used to create Server Fault Tolerance
Redundant server implementations take the concept of RAID 1 (mirroring) and applies it to a pair of servers to provide server fault tolerance. Each of the two servers have 100% of the data and the data is maintained in synch all the time.
RAID 0 (STRIPING)
Offers no redundancy or fault tolerance, hence does not truly fit the "RAID" acronym. In level 0, data is striped across drives, resulting in higher data throughput. Since no redundant information is stored, performance is very good, but the failure of any disk in the array results in data loss. This level is commonly referred to as striping.
Advantages of RAID 0
Since redundant data is not stored in RAID, hence the capacity of this RAID storage system is excellent, complete 100%.
This RAID level is very good for large data transfers.
Splitting up of data across various hard drives provides very high input/output rates.
There is no parity generation.
Since, copies of data are not created, hence it is very cost effective. No extra space is used in storing duplicate data.
It is very easy to implement RAID level 0.
Disadvantages of RAID 0
The single drive MTBF causes the data availability feature to be very low.
It is not a proper RAID level, since it cannot provide data redundancy.
A single disk failure can result in a considerable amount of data loss.
RAID 0 is not the right RAID level for critical systems, where data holds the prime importance.
RAID 1 (MIRRORING)
Provides redundancy by writing all data to two or more drives. The performance of a level 1 array tends to be faster on reads and slower on writes compared to a single drive, but if either drive fails, no data is lost. This is a good entry-level redundant system, since only two drives are required; however, since one drive is used to store a duplicate of the data, the cost per megabyte is high. This level is commonly referred to as mirroring.
This level is known for its mirroring capability. Two hard disks are used, out of which one stores duplicate data. In other words, same data is stored in both the hard disks. Thus, data redundancy is provided very well in this RAID level. However, the cost of implementing this RAID level becomes very high, since one of the hard drives is just used for keeping the duplicate content of the data in the other hard drive.
Advantages of RAID 1
The capacity of data storage in RAID 1 is not that bad. It is 50%.
For large data transfers, this RAID level is also very good.
In RAID 1, reading data is quite fast.
Most importantly, failure of any one of the disks, cannot cause data loss, as a backup is always there in the other hard disk.
This is another easy to implement RAID level.
Disadvantages of RAID 1
It is not very much cost effective, because one of the drives is just storing the duplicate data of the other.
The writing speed is decreased, since data has to be written twice.
The disk overhead is also very high
DUPLEXING: Is the same as mirroring but two drives controllers are being used.
RAID 2 (STRIPING AT THE BIT LEVEL)
In RAID 2, data is not stripped at blocks, but at the level of bits. Hamming code is used for error correction. Hamming code is a linear error correcting code. This is very efficient in recovering accurate data from the single bit corruption in data. Thus, this RAID level provides a very high data transfer rate.
Advantages of RAID 2
High data transfer rates.
Single bit corruption of data can be accurately recovered.
Multiple bit corruption can also be detected with much ease.
Disadvantages of RAID 2
Multiple bit corruption is possible.
Multiple bit corruption can be detected but not corrected.
The error bit correction logic is very complex. RAID 2 has become almost an obsolete method of data storage.
RAID 3 (STRIPING AT THE BYTE LEVEL)
In RAID 3, data is split at byte level. In this method, one additional hard disk is used for holding the parity bits. Since data is stored and stripped at the byte level, hence, accessing a single block of data requires access to more than one hard disks. This is another RAID level, whose use is very much limited to certain applications.
Advantages of RAID 3
For large file transfers, it provides very high read and write speeds.
It is quite cost effective.
The capacity of the hard disks used in this system is also very good, since, only one extra hard disk is used for storing the parity bits.
Disadvantages of RAID 3
RAID 3 is not very good for small data transfers.
Accessing a block of data means, dealing with more than one hard drive in the hard drive array.
Application is limited to certain specific fields.
RAID 4 (STRIPING AT THE BLOCK LEVEL)
RAID 4 is quite similar to that of RAID 3. It also uses a dedicated parity disk, but the difference is that, it strips the data at block level. This is another RAID level, which became obsolete very soon.
Advantages of RAID 4
It can provide multiple reads if the controller allows it to do so.
It is also quite cost effective.
Unlike RAID 3, it does not require synchronized spindles.
RAID 5 (STRIPING AT THE BLOCK LEVEL - MULTIPLE PARITY DRIVES)
This is perhaps the most popular RAID level. It also uses block level stripping, but a single dedicated hard drive is not used for holding the parity data. It also provides high storage capacity too. Provides redundancy by writing data and parity information across three or more drives, thus increasing performance.
Advantages of RAID 5
High read/write speeds are possible. As against RAID 3 and RAID 4, which were quickly replaced by RAID 5, the RAID level 5 allowed multiple writes.
It is very cost effective. With a minimum of just 3 hard drives, this RAID level can be implemented and explained.
The capacity of this RAID level is also very good.
Disadvantages of RAID 5
It is not very efficient with large data transfers.
Though the performance is very good, a disk failure can have a good impact on the system's performance.
RAID 10 (RAID 1 and 0 USED TOGETHER)
RAID 10 is often referred to as RAID 1+0. The reason is that this RAID level uses the combined features of RAID 1 and RAID 0. Here, a mirror of each block of data is created and data is also stripped. This is a very good system for handling multiple drive failures.
RAID 50
RAID 10 is often referred to as RAID 5+0. The reason is that this RAID level uses the combined features of RAID 5 and RAID 0.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the
Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3:
Telecommunications and Network Security (page 67).
and
http://www.buzzle.com/articles/raid-levels-explained.html
and
http://www.sohoconsult.ch/raid/raid.html

NEW QUESTION: 2
Which AWS services can host a Microsoft SQL Server database? (Select TWO.)
A. Amazon EC2
B. Amazon Redshift
C. Amazon Aurora
D. Amazon S3
E. Amazon Relational Database Service (Amazon RDS)
Answer: A,E
Explanation:
Reference: https://aws.amazon.com/sql/

NEW QUESTION: 3
Azure Time Series Insightsのインスタンスと、IoTデバイスからストリーミングテレメトリを受信するAzure IoTハブがあります。
デバイスからテレメトリを受信するには、Time Series Insightsを構成する必要があります。
どの3つのアクションを順番に実行する必要がありますか？回答するには、適切なアクションをアクションのリストから回答領域に移動し、正しい順序に並べます。

Answer:
Explanation:

Explanation:
Step 1: Create a dedicated consumer group..
Add a consumer group to your IoT hub.
Applications use consumer groups to pull data from Azure IoT Hub. To reliably read data from your IoT hub, provide a dedicated consumer group that's used only by this Time Series Insights environment.
Step 2: Add a new Time Series Insights event source.
Add a new event source
Sign in to the Azure portal.
In the left menu, select All resources. Select your Time Series Insights environment.
Under Settings, select Event Sources, and then select Add.
In the New event source pane, for Event source name, enter a name that's unique to this Time Series Insights environment. For example, enter event-stream.
Step 3: Configure the Time Series event source to connect to an existing IOT hub Step 4: For Source, select IoT Hub.
Step 5: Select a value for Import option:
If you already have an IoT hub in one of your subscriptions, select Use IoT Hub from available subscriptions. This option is the easiest approach.

Reference:
https://docs.microsoft.com/en-us/azure/time-series-insights/time-series-insights-how-to-add-an-event-source-iothub

NEW QUESTION: 4
Which of the following is NOT a feature of ClusterXL?
A. Zero downtime for mission-critical environments with State Synchronization
B. Transparent upgrades
C. Enhanced throughput in all ClusterXL modes (2 gateway cluster compared with 1 gateway)
D. Transparent failover in case of device failures
Answer: C

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