Everything There Is to Know about Alibaba Cloud’s Sixth-Generation ECS Instances

Overall Upgrades

Latest Generation Customized Processors

Alibaba Cloud’s Proprietary Computing Platform

Figure 5 The X-Dragon computing platform

Alibaba Cloud’s Proprietary Network Platform

Alibaba Cloud’s Proprietary Storage Platform

  • It uses vhost-user as the backend of vhost-blk and offloads the I/O dataplane from QEMU. In this way, the I/O request lifecycle completely bypasses QEMU.
  • It uses the SPDK framework to interact with NVMe SSDs and adopts a user-state driver and multi-queue adaptive polling mode.
  • The user-state driver switches to the coroutine and adds the run to completion mode. User-state drivers can avoid the performance loss that occurs when the system must call the kernel to handle each sent I/O request. Coroutines are implemented in user-state to further reduce the kernel thread scheduling overhead.
  • We have upgraded the storage servers and NVMe SSDs and now use two 25 Gbps NICs.
  • During volume replica chain synchronization, we use the high-performance Remote Direct Memory Access (RDMA) protocol, adopt our in-house switch chips and VSwitches, and have implemented chip-level optimization for the RDMA protocol. This reduces end-to-end communication latency across VSwitches to two microseconds (4 KB + 128B ACK round robin latency).
  • We now append data in the Append Only mode, which records all write operations in sequence and then modifies the pointer. This greatly improves the NVMe SSD throughput.
Figure 7 Apsara Distributed File System — ESSD

Summary

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Follow me to keep abreast with the latest technology news, industry insights, and developer trends. Alibaba Cloud website:https://www.alibabacloud.com

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