Exadata X7来了

Posted 2020-10-09 missyou_shiyh

1、Exadata Brings In-Memory OLTP to Storage

• Exadata Storage Servers add a memory cache in front of Flash memory
  • Similar to current Flash cache in front of disk
• Cache is additive with cache at Database Server
  • Only possible because of tight integration with Database
• 2.5x Lower latency for OLTP IO – 100 usec
• Up to 21 TB of DRAM for OLTP acceleration with Memory Upgrade Kit
  • Compare to 5TB of flash in V2 Exadata

 

Non-Volatile Memory Cache in Exadata Storage

• Exadata Storage Servers will add Non-Volatile memory cache in front of Flash memory – Intel 3D X-Point
• Add software for RDMA access for much lower latency
  • RDMA direct access to NVRAM gives 20x lower latency than Flash
• NVRAM used as a cache effectively increases its capacity by 10x vs using NVRAM directly as expensive storage
• Expensive NVRAM shared across servers for lower cost
• NVRAM mirrored across storage servers for fault-tolerance