Question

Look up and define "chipkill" as an error control/correction approach. In your reasoned opinion (a yes or no answer is not sufficient), what are the merits of chipkill?

Answer 1

Answer:-

"chipkill":-

Chipkill is IBM's trademark for a form of advanced error checking and correcting (ECC) computer memory technology that protects computer memory systems from any single memory chip failure as well as multi-bit errors from any portion of a single memory chip.One simple scheme to perform this function scatters the bits of a Hamming code ECC word across multiple memory chips, such that the failure of any single memory chip will affect only one ECC bit per word. This allows memory contents to be reconstructed despite the complete failure of one chip. Typical implementations use more advanced codes, such as a BCH code, that can correct multiple bits with less overhead.

A memory module technology from IBM that, similar to RAID 3 for hard disks, spreads the bits across multiple memory chips. It can take bad memory chips offline when too many bit errors are encountered and also correct errors of several bits per module. Chipkill typically exceeds the error correction in ECC memory. Although often referred to as Chipkill, similar technologies from other vendors are Single Device Disable Code (SDDC) from Intel, Extended ECC from Sun and Chipspare from HP.

Chipkill is frequently combined with dynamic bit-steering, so that if a chip fails (or has exceeded a threshold of bit errors), another, spare, memory chip is used to replace the failed chip. The concept is similar to that of RAID, which protects against disk failure, except that now the concept is applied to individual memory chips. The technology was developed by the IBM Corporation in the early and middle 1990s. An important RAS feature, Chipkill technology is deployed primarily on SSDs, mainframes and midrange servers.

merits oof chipkill:-

Increased Performance

Network Centric

The Memory Subsystem

Proliferation of Parts

ECC Performance

The Dark Side of Memory Reliability

Chipkill Schemes The possibility of a DRAM failure to cause either a system crash (uncorrectable error or UE) or a data integrity problem (undetected uncorrectable error or the “Million Dollar Check”) has been absolute anathema to the designers of main