SQL Server & la virtualisation : « 45 minutes inside » !
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Consolidation, cloud privé, cloud public, SQL As A Service etc. sont autant de scénarios de virtualisation possibles avec SQL Server. Cette session reposera les règles de bon usage de ce type de déploiement et les scénarios clés. Nous reviendrons sur quelques-unes des « Lessons learned from Azure ».
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SQL Server & la virtualisation : « 45 minutes inside » !
- 1. AMBIENT INTELLIGENCE tech days• 2015 #mstechdays techdays.microsoft.fr
- 2. select * from techdays2015.speaker_principals Christophe LAPORTE Consultant Formateur Indépendant Blog http://conseilit.wordpress.com/ Twitter @Conseilit Email christophe_laporte@hotmail.fr Nadia BEN EL KADI SQL Server Team Microsoft France Blog : http://blogs.technet.com/b/dataplatforminsider/
- 3. tech.days 2015#mstechdaysSESSION Agenda – SQL Server & la virtualisation Introduction Why virtualizing Advantages of virtualization Demo / Deployement Virtualization Support rules & Best Practices Virtualization HA scenarios Troubleshooting & Monitoring & Good to know Case Study Virtualization & cloud : A sample usage scenario Conclusion
- 4. tech.days 2015#mstechdaysSESSION Introduction DatabasesInstancesVirtual Machines Sales_1 Marketing_1 Online_Sales ERP_10 ERP_10 DB_1 DB_2 DB_3 Consolidate_1 Consolidation Standardize to fewer hardware Reduce space, power Improve Hardware Utilization Improve Management Efficiency Lowered cost and complexity
- 5. tech.days 2015#mstechdaysSESSION Pourquoi virtualiser ? • Historiquement • Consolidation • Maintenance de matériel obsolète • Peu adapté à de lourdes charges de travail (OLTP / DWH) • Actuellement • Le matériel à évolué • CPU / RAM / Réseau (10Gb, RDMA) • Disques (SAN Full Flash / SSD, Cartes Flash) • Les hyperviseurs ont aussi évolué • Gestion des ressources • Performance • Les serveurs bases de données peuvent être candidat à la virtualisation
- 6. tech.days 2015#mstechdaysSESSION Avantages de la virtualisation • Faible adhérence au matériel • Migrations facilitées • Mise à jour hyperviseur • Flexibilité • Modification (à chaud) de la configuration d’une VM • Redimensionnement à chaud des VHDX • Limitation de la bande passant disque si nécessaire • Affectation de ressources à l’instant T et non pas en fonction de la durée de vie du projet • Nombre de CPU • Mémoire • Dépannage • Clonage à chaud (ou export depuis un checkpoint) d’une VM
- 7. tech.days 2015#mstechdaysSESSION SQL Server virtualization
- 8. tech.days 2015#mstechdaysSESSION SQL Server support for virtualization http://support.microsoft.com/kb/956893/en-us
- 11. tech.days 2015#mstechdaysSESSION HOST Better when the host supports SLAT (Second Level Address Translation) and NUMA (Non-Uniform Memory Access) Most modern servers provide these features Take Care of the overcommitting : (VP:LP) ratio Antivirus (extensions VHD/VHDX/AVHD/AVHDX) Let enough Memory for the HOST for the VMs management Monitor Memory usage to prevent performance issues
- 12. tech.days 2015#mstechdaysSESSION Guest VM Maximizing GUEST CPU Identify and categorize virtual machines based on their loads and allocate #Vcpu processors accordingly. Maximizing GUEST Memory Allocate a reasonable amount of memory to the virtual machines running SQL Server workloads so that they can handle the expected loads (at peak and off-peak times) If using Dynamic memory to provide better stability to a virtual machine workload, grant Lock Pages in Memory user rights to the SQL Server service account.
- 13. tech.days 2015#mstechdaysSESSION Pass-through Disk VHD (Virtual Hard Disk) Fixed Size VHD : Best performance Dynamic VHD : Expand on demand Hyper-V 2012 has the new VHDX format Hyper-V 2012 has Virtual Fiber Channel to connect directly to FC storage from within a virtual machine. Storage
- 14. tech.days 2015#mstechdaysSESSION Reduce IO with Instant File Initialization 0 10 20 30 40 50 60 Create 100 GB database Restore 100 GB database Time(minutes) Impact of Instant File Initialization Without Instant File Initialization With Instant File Initialization
- 15. tech.days 2015#mstechdaysSESSION Reduce IO with Data Compression 400000 500000 600000 700000 800000 900000 1000000 100000 150000 200000 250000 NONE PAGE Reads Time(ms) Query Performance with Data Compression CPU Time Elapsed Time Logical Reads Physical Reads (+RA) 0 10 20 30 40 50 60 70 NONE PAGE Throughput(BusinessTransactions/sec) OLTP Throughput Throughput
- 17. tech.days 2015#mstechdaysSESSION Comparison : Physical vs Virtual Enterprise Strategy Group (ESG) Tested the difference in performance between the brokerage application running in a Hyper-V VM & a native physical server Increased Scale & Performance The 2 tests showed just a 6% difference between the brokerage application running on physical vs. virtual Download Full Report The full report is available for public download here. 0 200 400 600 800 1000 1200 1400 1600 Physical Virtual Transactions/Sec Hyper-V OLTP Workload Analysis
- 19. tech.days 2015#mstechdaysSESSION Points d’attention • Diagnostic • Niveau 1 : hyperviseur (CPU, disque, mémoire) • Est-ce que le Host est chargé • Quelle sont les limites du Host • Hyper-V Processor Counters : best way to get true measure of CPU utilization • Hyper-V Logical Processor: Total CPU time across entire server • Hyper-V Virtual Processor: CPU time for each guest virtual processor • Niveau 2 : Guest OS (CPU, disque, mémoire) • Est-ce que le Guest est chargé (OS) • Est-ce que SQL Server est chargé • Compteurs de performance système / SQL Server • DMVs / DMFs • Pensez à ne pas surexploiter le host • Pas de surexploitation de la mémoire • Nombre de vCœurs vs nombre de cœurs • pNUMA vs vNUMA • Stratégie de sauvegarde
- 20. tech.days 2015#mstechdaysSESSION Troubleshooting Common VM Issues Issue KPIs To Monitor Actions to Consider CPU at or near 80% % Processor Time (_Total) SOS_SCHEDULER_YIELD waits Increase instance size Identify top consuming queries and tune Load balance (e.g. move DB to another instance) Near I/O capacity limits or IO Latency Increases Average disk reads per second Average disk writes per second Disk reads per second Disk writes per second io_virtual_file_stats PAGEIOLATCH waits SQL Server: Buffer ManagerPage Life Expectancy Check Page Life Expectancy counter, for mem pressure. Increase instance size Identify which DB and log files have I/O bottleneck Add more data disks and separate data files if near IOPS limits per disk Tune queries to reduce reads and writes Consider enabling row or page compression Memory resource pressure Memory: Available Bytes Memory: Pages per second SQL Server: Buffer ManagerPage Life Expectancy Process: Working Set (for SQL Server) RESOURCE_SEMAPHORE waits Check max server memory setting for SQL Server. Use high memory instance Identify SQL component (such as, CLR, high memory grants for app queries, et.), tune appropriately.
- 21. tech.days 2015#mstechdaysSESSION Characteristics of a cloud Shared Infrastruct ure Scalable and Elastic Usage Based Self Service
- 22. tech.days 2015#mstechdaysSESSION Exemple : Catalogue de services Self Service provisioning
- 23. tech.days 2015#mstechdaysSESSION Conclusion • Read the white papers • Control/discover your DB sprawl • Run MAP toolkit to identify running DBs • Capacity Planning • Understand Isolation/security/HA requirements • Plan and test for IO perf variability • Identify optimal VM size • Use Filegroups and multiple data disks for large DBs • Begin conversion (virtualize) • Use P2V to keep existing settings • Create new VM to combine multiple apps • Identify your KPIs to monitor • Revisit optimization decisions as workload changes
- 24. © 2015 Microsoft Corporation. All rights reserved. tech days• 2015 #mstechdays techdays.microsoft.fr