Do you know how the internet is stored? It is divided into three types , each of which is different . Storage knowledge is the basis of the Internet network. Storage is like the human brain database, where a large amount of information exists for easy reading by computer CPU; block storage, file storage and object storage are all storage, but they are very different.
If there are four hard disks A, B, C, and D in the disk array, each hard disk is 100G, and four logical disks are divided into four logical disks for the host to use in different ways. The same four discs, what’s the difference? The two seem to be the same, but the first disk of the latter may have 25G from hard disk A, 30G from hard disk B, 20G from hard disk C, and 25G from hard disk D. This wave of operations makes the reading and writing speed faster, and the logical disk is no different from the physical hard disk to the host, just like the C disk and D disk on the computer, but it cannot be shared, and file storage was born.
A server/laptop can set up FTP and NFS services as long as the appropriate operating system and software are installed. After such services are set up, the host can directly upload and download files to the file storage. However, this storage also has its shortcomings. File storage is similar to going to the archives to look up information. First, you need to enter the building of the archives, find the room where the archives are stored, find the corresponding cabinets, drawers, and folders, and finally take out the files from the folder. It will make the read and write rate low and the upload and download speed slow. Object storage is a way to share and fast .
In object storage, data is broken down into discrete units called “objects” and stored in a single repository. Object storage separates the metadata. The control node is called the metadata server, which is mainly responsible for storing the attributes of the object, while the other distributed servers responsible for storing data are called OSDs, which are responsible for storing the data part of the file.
When a user accesses an object, it will first access the metadata server. The metadata server is responsible for reporting which OSDs the object is stored in. Assuming that the feedback file A is stored in three OSDs, B, C, and D, the user will directly access the three OSD servers to read. fetch data. Since 3 OSDs transmit data at the same time, the transmission speed is accelerated. When the number of OSD servers is larger, the reading and writing speed will be improved faster. In this way, fast reading and writing can be achieved.
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