【Answer】1. AB 2. B 3. A 4. C 5. D
【Winner】viettel，dangthi，chibread，IndianKid，Kba
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Hello, everyone!
Join the Community Learning week IT Storage class!
IT class learning time of this phase: April 12th – April 17th.
Answer time of this class: April 13th, 2 AM - April 14th, 10 AM (UTC+0).
Class topic
Post 1. What is storage?
Storage is to save data to certain storage media in a proper, secure, and effective manner to meet the requirements of different application environments and ensure effective access to the data. Specifically:
1. Storage is physical media for temporary or long-term data storage.
2. Storage is a method or behavior for ensuring data integrity and security. Storage combines the two aspects to provide customers with a data storage solution. ...(more)
Post 2. Smart disk enclosure of Dorado V6
The smart disk enclosure receives the reconstruction request and reads data locally to calculate the parity data. Then, it only needs to transmit the parity data to the controller. In the figure on the right, only four blocks of parity data need to be transmitted between the controller and the smart disk enclosure, saving network bandwidth by 5.25 folds....(more)
Post 3. SmartMatrixFully Interconnected Disk Enclosures
Smart SAS and smart NVMe disk enclosures use the same networking mode. In this networking, a controller enclosure uses the shared 2-port 100 Gbit/s RDMA interface modules to connect to a disk enclosure. Each interface module connects to the four controllers in the controller enclosure through PCIe 3.0 x16. In this way, each disk enclosure can be simultaneously accessed by all four controllers, achieving full interconnection between the disk enclosure and the four controllers....(more)
Post 4. Basic Concepts of Storage Protocols
The term RAID was invented by David Patterson, Garth A. Gibson, and Randy Katz at the University of California, Berkeley in 1987. It combines multiple independent physical disks into a virtual logical disk using related algorithms to provide larger capacity, higher performance, and better error tolerance capabilities....(more)
Post 5. SSD Technologies:SSD Architecture
Solid state drives, or SSDs, were considered a revolutionary advance in data storage when they were introduced to the market, and they continue to be the preferred drive for the vast majority of consumer and industrial-grade Flash storage products....(more)
Class Questions
After attending this class, please answer the following questions and comment with the answers below this post.
1. (Multiple-Answer Question) Which are the major storage performance indicators?
A． IOPS
B． Bandwidth
C． Capacity
D． Compatibility
2. (True or False) Data reconstruction of a traditional disk enclosure has no different from that of the smart disk enclosure of Dorado V6.
A. True
B. False
3. (True or False) On OceanStor Dorado 3000, 5000, and 6000 V6, a disk enclosure can connect to only one controller enclosure and be accessed only by the controllers in that controller enclosure.
A. True
B. False
4. (Single-Answer Question) One or multiple logical volumes can be created for RAID based on the specified capacity. A logical volume is identified by what?
A. LUN group
B. Host
C. LUN
D. Partition
5. (Single-Answer Question)T What are the core features of an SSD?
A. RAM
B. Flash
C. DDR
D. NAND components
Hope you get good grades, come on! 
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