New technologies introduced by server memory

Server as the enterprise information to the core computer, running the Enterprise key business. The unexpected redundancy or failure of the server may cause incalculable loss to the enterprise. The server is also a computer, but it is different from the desktop computer or laptop we use. In addition to the data processing performance than the average desktop computer to meet complex enterprise data processing, while ensuring that the server's normal and reliable operation of the importance of the application of many desktop computers do not have special technology.

For example, server memory, but also belong to a type of memory, but not as we use the computer memory, attention is often the memory bus speed, bandwidth, wait for the cycle parameters. But for the server, we consider the memory vendors, server vendors for server memory introduced by the new technology. Here, I introduce to you the current major memory manufacturers, server manufacturers in the mainstream server memory technology:

1, ECC Memory: This memory we often see on the server, is the most basic server memory technology, ECC English full name is "error Checking and correcting" (Error checking and correction), it is widely used in various fields of computer instruction. ECC and parity (Parity) are similar. However, in places where the parity can only detect errors, ECC can actually correct most of the errors. After the memory error correction, the computer's operation instructions can continue to execute. This in virtually guaranteed the stability and reliability of the server system.

2, Register: Register or directory Register, the role in memory we can take it to understand the catalog of the book, with it, when the memory is read and write instructions, will first retrieve this directory, and then read and write operations, which will greatly improve server memory efficiency. With register memory must be with buffer, and currently can see the Register memory also has ECC function, its main application in high-end server and graphics workstation.

3, Chipkill Memory technology: Chipkill memory was originally developed by IBM mainframe 20 years ago, is based on ECC technology improvements. Using just plain memory SD memory, DDR memory, the Chipkill memory controller provides storage protection that is conceptually similar to a checksum disk array, where data is written to multiple DIMM memory chips. In this way, each DIMM plays the same role as the storage array. If any one of the chips fails, it affects only one bit of the data byte, because the other bits are stored on another chip. After an error occurs, the memory controller can reconstruct the "lost" data from the failed chip, allowing the server to continue working properly. Using this Chipkill memory technology, memory can simultaneously check and repair 4 error data bits, further improve the practicability of the server.

4, Memory image (Memory mirroring) technology: It works with the hard disk of the hot backup similar, in order to ensure that when a DIMM memory chip failure, the technology can automatically use the standby bit bit automatically retrieve data, so as to ensure the smooth operation of the server. This technique corrects errors that occur to up to 4 contiguous bits in memory per pair of DIMMs. When a random soft memory error occurs, it can be resolved by using a bit bit of hot backup, and if a persistent hardware error occurs, the DIMM memory chip will continue to work using the hot backup bit, until it is replaced.

5, Memory protection (Memory protexion) technology: IBM's Another advanced memory technology is memory mirroring technology, memory mirroring technology is like disk mirroring technology, is to write the data to two separate memory performers (each memory card configuration is the same). In normal working conditions, the memory data reads only from the active memory card, only when the active memory fails, the data is read from the mirrored memory. It is more protected than several of the memory protection technologies described earlier.