Using nonvolatile m emory NVDIMMN as block storage in Windows Server 2016 Tobias Klima Program Manager Use Case Example Fast Transactions in SQL Server Problem DB Transactions gated by log commit speed ID: 771205
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Using non-volatile memory (NVDIMM-N) as block storage in Windows Server 2016 Tobias Klima Program Manager
Use Case Example – Fast Transactions in SQL Server Problem DB Transactions gated by log commit speedThe faster the log, the more DB updates possibleOpportunityAccelerate Log CommitsAccelerate DBProvide better customer SLAsApproachLog on SCM – Persistent Medium on Memory BusNVDIMM-N supported in WS 2016NVDIMM-N based on DDR4 RAM + Flash for backupExposes Block Interface (like a Disk) SCM Traditional Storage PCIe CPU SATA SAS NVDIMM-N NVMe AHCI HBA Memory
Storage technology has made significant strides (capacity , latency, throughput).Technology Evolution & Old AssumptionsHDD (SATA/SAS)SSD (SATA/SAS)PCIe SSD (AHCI/NVMe)NVDIMM-N (SCM)Capacity: LargeLatency: HighThroughput: Low Capacity: MediumLatency: MediumThroughput: Medium Capacity: Medium Latency: LowThroughput: High Capacity: SmallLatency: Very LowThroughput: Very High SCM Performance breaks assumptions about “slow storage” in today’s software For the highest performance, use byte-addressability (app changes) For early adoption and easy use, utilize it as a block device (no app changes)
Block Mode Architecture (In Software) The Idea Block Interface on top of the memory ranges of SCM deviceFactsCompatible with existing applications (ReadFile, WriteFile)Extremely fast “disk” – <10us for 4k I/ODisk Filter Drivers may not work (e.g. Disk Accelerometer, low-level “accelerators”)File SystemSCM Disk Driver Load/Store Operations SCM Bus Driver Enumerates SCM Device User Mode Kernel Mode Application Standard File API Application Standard Raw Disk Access SCM
NVDIMM-N Block Mode Performance Tobias Klima Hardware Provided By:
Device Management Like a Disk Exposed in OS as a new disk deviceRe-uses existing PowerShell cmdlets:Get-PhysicalDiskGet-StorageReliabilityCounterEnabled by Microsoft-defined _DSM specification (MSDN) Useable in Storage Spaces for striping, mirroring, write-back caching
How would you change your app, if you could do fast, reliable, synchronous I/O?What data (structures) do your apps use frequently? Which need the lowest possible access latencies? Re-visit Build on Channel 9.Continue your education atMicrosoft Virtual Academy online.Call to Action