UCloud is a leading neutral cloud provider in China, developing its own IaaS, PaaS, AI service platform, and big data exchange platform, and delivering comprehensive industry solutions for public, private, hybrid, and dedicated clouds.
This article examines the rapid adoption of 25G SmartNICs for cloud workloads, compares major vendor solutions, explains why an Open vSwitch‑based TC Flower offload design was chosen, and details the practical challenges and performance gains achieved when deploying the solution in a public‑cloud environment.
UCloud’s latest SSD cloud disk redesign dramatically improves performance—raising IOPS by 13‑fold, cutting latency tenfold, and expanding capacity—through a two‑layer IO path, 1 MB metadata shards, multithreaded models, overload protection, online migration, and upcoming RDMA/SPDK‑based ultra‑high‑performance storage solutions.
The article investigates a Go 1.8.3 issue where goroutines block on ForkLock during fork‑exec, analyzes the kernel and Go runtime behavior, presents a hypothesis about memory‑heavy processes, validates it with experiments, and shows that upgrading to Go 1.9 or later eliminates the problem.
UCloud’s first Tech Talk detailed a comprehensive redesign of its cloud disk architecture, introduced ServiceMesh‑based gray‑scale deployment for virtual networking, and unveiled a second‑level snapshot system that delivers second‑level continuous backups with rapid restore capabilities, all backed by NVMe and programmable switch innovations.
The article investigates intermittent CPU usage spikes on Linux servers caused by a kernel cputime bug, explains the root‑cause analysis, describes a cold patch applied to newer kernels, and details a hot‑patch solution that safely resolves the issue across thousands of production machines.
This article explains how to convert three‑layer routing into two‑layer switching (and vice‑versa) using OpenFlow and OVS, covering the differences between routing and switching, flow‑table configuration, ARP handling, TTL management, and practical Linux commands to achieve cross‑subnet communication without a traditional gateway.
This article explains why UCloud introduced a Service Mesh, how Istio was chosen and adapted for the UAEK Kubernetes platform—including IPv6 challenges, performance testing, and future improvements—providing practical insights for building reliable micro‑service infrastructures.
The July 2018 Ceph Developer Monthly report from the UMCloud storage team summarizes the latest community contributions, including enhancements to object and block storage, new OPA integration for fine‑grained access control, crash‑dump management, dashboard user UI, and batch operations for ceph‑volume.
Edge computing distributes compute and storage to network edge nodes, reducing latency and bandwidth usage, while UCloud's dynamic acceleration network leverages optimized routing, private UTP protocol, and seamless integration with edge platforms to enhance data transmission across diverse, often weak, network environments.
This article explores the advantages, architectural layout, network planning, and practical technologies for global server games, emphasizing microservice-based modular design, automated deployment, frame‑synchronization over UDP, centralized versus distributed deployment models, and considerations of latency, data consistency, and blockchain integration.
