What does diskless write back and caching do?

You know that diskless clients don't have hard disks, so when the client wants to write data, it writes to the temporary files on the hard disk on the server, which is called write-back.

You know that diskless clients do not have hard disks, and the read and write data are read and written from the server, in order to improve the speed, the server will use memory as a cache to cache the hard disk data. This is called caching.

Let me tell you: If you are careful, it is not difficult to find that the cache hit rate of the server-side write-back disk is often very low, and it is also common to have more than 10% or even a few percent. The reason is that write-back has been blocked by the local cache of the workstation first, and those who can run to the server are the most unpopular fish that have been eliminated.

The larger the memory of the workstation and the more write-back caches are set accordingly, the less write-backs and fewer readbacks will be on the server. Therefore, in principle, the cache hit ratio of the server-side write-back disk is as low as possible, rather than higher as possible. If your writeback disk has not been accessed for half a day, and the cache hit rate is 0%, congratulations, quickly hide in the corner and have fun.

The contents of the system and applications of the diskless client are stored in the read disk, and the personalized information of each client (such as the temporary files of virtual memory) is stored in the write disk

Since the read and write speed of the hard disk is much lower than that of the memory, in order to reduce the insufficient performance of the disk, the performance bottleneck of the whole system is caused. When data is temporarily stored in memory as read-ahead or deferred data writes, this part of the memory is the cache.

Cache (L1 cache) is the first layer of the CPU cache. The capacity and structure of the built-in L1 cache have a great impact on the performance of the CPU, but the cache memory is composed of static RAM, and the structure is complex, and the capacity of the L1 cache cannot be too large when the CPU die area is not too large.

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Write-back is to store the data written by the client, which mainly determines the write-back space capacity based on the number of machines in your client.

Two write-back disks are used against one write-back disk to relieve disk pressure and improve client performance. Try to use SSD for write-back, and generally use 2G as the write-back unit for clients. To add 100 machines, you need 200G of write-back space (of course, this is not absolute, if you set up client memory for write-back caching, and the client memory is large enough, the relative write-back will be much less.) ）。

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Hello. Because the computer does not have a storage device in the diskless system, the Windows system will produce a large number of temporary files during the system startup process, and it needs to be written back to the write-back disk of the diskless system server, and this process is called memory write-back.

Diskless is the use of a computer as a server, this server has a hard disk and a system, other computers do not have a hard disk and no optical drive, so it is called a diskless system. When these diskless computers are to be used, they are connected to the server through a chip on the network card, and the system is shared through the server.

The diskless system does not have the function of writing, that is, your things can only be stored in the memory, and there is no shutdown, because there is no hard disk, so it will not be poisoned, the stability is good, and it saves money. The disadvantage is that you can only run small programs, and if it's big, it will get stuck, and you can't play games.