ULLtraDIMM
SanDisk solid state storage on the DDR3 memory bus.
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The ULLtraDIMM is a solid state storage device from SanDisk that connects flash storage directly onto the DDR3 memory bus. Unlike traditional PCIe Flash Storage devices, the ULLtraDIMM is plugged directly into an industry standard RDIMM memory bus slot in a server, providing deterministic (consistent) known latency to enable applications to be streamlined for improved performance.
Quick Facts
- Form factor
- JEDEC MO-269 DDR3 RDIMM
- Voltage support
- 1.35 V and 1.5 V
- Ecc usage
- DDR3 ECC bits verify data integrity across memory bus; separate ECC for flash array
Facts from the source article.
Background
The ULLtraDIMM was designed to place flash storage directly on the DDR3 memory bus, using standard RDIMM slots in servers. This placement allows the CPU to treat the device's ECC in the same manner as ECC from a memory DIMM, with single symbol errors corrected. The DDR3 ECC bits are not stored in the flash array; a separate ECC scheme protects data within the flash.
Memory interleaving of standard RAM is not affected by the presence of ULLtraDIMMs. The device supports both 1.35 V and 1.5 V operation across a range of DDR3 transfer rates, and at 1.5 V it can operate at 1600 MHz. UEFI/BIOS updates are required for the system to properly recognize the ULLtraDIMM as a block device and to avoid halting the bootstrap sequence.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: ULLtraDIMM (CC BY-SA 4.0).
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