共享存储导航：利用 SSD 服务质量缓解性能挑战.pdf

1、Navigating Shared Storage:Mitigating Performance Challenges with SSD Quality of ServiceYuliya Tarnikova Google Dan Helmick Samsung STORAGESystem and Problem set-up Yuliya Host system Goals for QoS in different use-casesExample scenarios of concernQuality of Service(QoS)Dan TP4176(in Phase 2)Quality

2、of Service for PCIe Bandwidth and IOPS for a controller Example weighting expectations for some parametersAgendaHyperscaler PerspectiveAs shared at FMS 2025Challenge:Consistent,Predictable,&Performant VM Guest ExperienceLive migration should not be observable by the guest VMLive migration should be

3、efficient and performance isolatedHardware iteration should not be observable by the guest VMIncludes SSD upgrade,platform change,etcHistorical Approach to Achieve these GoalsHyperscaler-specific logic to make changes invisible to the guest VMFor lower latency,vendor specific changes to SSDs were in

4、troducedStandards Solve this Challenge in a Durable Manner Samsung,Google,Microsoft,and others have led standards activities in NVMe and OCP since 2023 to solve this challengeFeatures are delivered piece by piece to advance the ecosystem Hardware&software are tested at scale in a robust mannerRobust

5、 standards needed to broadly deliver the consistent,predictable,performant VM storage experience Challenge:Consistent,Predictable,&Performant VM Guest Experience in a Multi-Tenant EnvironmentA“slice”of the drive that feels like a performance isolated smaller drive for each tenantFundamental Requirem

6、entsAbility to advertise and deliver consistent performance.Performance isolation:Guarantee customer SLAs with noisy neighborsFair resource sharing:Fair allocation of shared resources like NAND and PCIe bandwidth under contentionFungibility:Ability to introduce new drives into existing VM families w