Intel DAOS Notes

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Recently, I have been exposed to too many professional terms, abbreviations, and I really don’t know what it means without recording them.

DAOS diagram

In this picture, we can actually understand why the performance of DAOS is stronger than that of Ceph, not only because of the use of flash memory, but also because of the new storage architecture to achieve higher performance.

Difference Between Intel Optane Persistent Memory and Intel Optane SSD

Both use the same Intel® Optane™ memory media, but they are completely different products.

Intel Optane persistent memory resides in a DIMM package, runs on the DRAM bus, and can be used as either volatile or persistent memory. Just insert it into the memory slot of the server.

Intel Optane SSDs, on the other hand, are strictly used for fast storage in standard NAND package models (AIC, M.2, U.2, EDSFF, etc.) and reside on the PCIe bus using the NVMe* protocol, serving as storage devices to keep data at all times lasting.

Difference Between Intel Optane Persistent Memory and Standard DRAM

Simply understand, Optane actually has two operating modes.

  • Memory mode, in this mode, Optane memory, like standard memory, loses data after a power failure. In memory mode, it must be used with traditional memory instead of Optane memory alone.
  • In cache mode, in this mode, Optane storage becomes a disk, and data is not lost after power failure.

Under linux, kernel support is required, and different modes need to be enabled on the command line.

Similarities: Packaged in DIMMS, resides on the same bus/channel as DRAM, and can store volatile data in the same way as DRAM;

The difference: Persistent memory capacity is much higher than traditional DRAM. PMem modules are available in 128GB, 256GB and 512GB capacities, much larger than the usual 16GB to 64GB DRAM modules, although larger capacity DRAM modules also exist.

Looking at the documentation, there are requirements for the combination of DRAM and Optane.

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