VMworld 2015: Advanced SQL Server on vSphere

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Information about VMworld 2015: Advanced SQL Server on vSphere

Published on July 8, 2016

Author: VMworld

Source: slideshare.net

1. Advanced SQL Server on vSphere Scott Salyer, VMware, Inc Wanda He, EMC VAPP5598 #VAPP5598

2. • This presentation may contain product features that are currently under development. • This overview of new technology represents no commitment from VMware to deliver these features in any generally available product. • Features are subject to change, and must not be included in contracts, purchase orders, or sales agreements of any kind. • Technical feasibility and market demand will affect final delivery. • Pricing and packaging for any new technologies or features discussed or presented have not been determined. Disclaimer CONFIDENTIAL 2

3. The Percentage of Applications in Virtualized Infrastructure Has Increased Dramatically over the Last Few Years (VMware Core Metrics Survey July 2015) CONFIDENTIAL 3 Microsoft SQL is the most common application running in on-premise virtual infrastructure NA EU dAP BRIC SMB COMM ENT 57% 73% 70% 74% 68% 71% 64% 47% 51% 39% 56% 43% 51% 54% 41% 43% 46% 61% 36% 46% 57% 45% 54% 37% 41% 43% 49% 46% 34% 38% 59% 51% 37% 39% 48% 26% 27% 32% 37% 24% 34% 33% 25% 30% 23% 35% 16% 30% 39% 29% 16% 31% 27% 22% 22% 30% 15% 23% 30% 28% 19% 24% 25% 15% 22% 22% 30% 17% 21% 25% 71% 62% 62% 64% 65% 64% 68% 48% 54% 49% 55% 50% 51% 53% 51% 45% 49% 49% 44% 49% 53% 36% 35% 39% 46% 37% 40% 37% 20% 15% 20% 26% 15% 17% 25% 600 450 230 323 653 346 604 Region Company Size 67% 49% 46% 45% 42% 29% 28% 25% 22% 21% 66% 51% 49% 38% 19% Microsoft SQL Microsoft SharePoint SAP Microsoft Exchange Oracle Databases Oracle Applications High Performance Computing Custom BCA/ industry-specific Oracle Middleware IBM Middleware Business critical Important Development Test Staging  Applications in Virtualized Infrastructure > Total < Total N = 1603  Level of Criticality of Applications in Virtualized Infrastructure (Select all that apply) (Select all that apply)

4. Virtualizing Applications Sessions and Offerings • 30 Breakout Sessions with 5 Panels & 4 Quick Talks • 10 Group Discussions • One-on-One Meet the Experts Sessions • Checkout the Hands on Labs Sign up for the Independent Oracle User Group (IOUG) VMware Special Interest Group (SIG) www.ioug.org/vmware

5. RDBMS Books from VMware Press CONFIDENTIAL 5 Book signing @ 1PM Tuesday Sept 1 vmwarepress.com http://www.pearsonitcertification.com/store/virtualizing-oracle-databases-on-vsphere-9780133570182 http://www.pearsonitcertification.com/store/virtualizing-sql-server-with-vmware-doing-it-right-9780321927750

6. Agenda CONFIDENTIAL 6 1 Introduction – Why Virtualize SQL Server? 2 Designing for Performance • Storage Design • Memory Optimization • NUMA Considerations • ExtremeIO Enhancements • Monitoring and Troubleshooting 3 Consolidating Multiple SQL Server Workloads 4 SQL Server Availability

7. Introduction Why virtualize SQL Server?

8. Quick Facts • SQL Server database servers account for ~10% of all x86 workloads and are typically underutilized (6-20% CPU utilization) • Many Database Administrators (DBAs) are hesitant to virtualize database servers due to perceived issues with performance, availability, and licensing • Running SQL Server workloads on vSphere can help to reduce physical server and licensing costs while increasing availability without sacrificing performance • The VMware SDDC platform offers management benefits that extend to both the infrastructure administrator and the DBA – In-depth application monitoring and trend analysis – Automation and provisioning of database components for developers (self-service) – Application and site-resiliency CONFIDENTIAL 8

9. Reduce hardware costs by > 50% • Consolidate servers by 4X – 20X Provision databases on demand • Minutes to provision in production and in the lab Reduce licensing costs • Potentially increase utilization of SQL Server licenses (depending on degree of consolidation) Increase application Quality of Service • Scale dynamically • Built-in high availability and simple disaster recovery DB On Demand Quality of Service DB Consolidation Why Deploy SQL Server on VMware SDDC? CONFIDENTIAL 9 Licensing Complete isolation between systems on the same host • Protects databases and applications against network-based threatsSecurity

10. Designing for Performance Tier-1 Production Workloads

11. Storage Design

12. Factors Affecting Storage Performance CONFIDENTIAL 12 vSCSI adapter Application VMKernel FC/iSCSI/NAS VMKernel admittance ( Disk.SchedNumReqOutstanding) Per path queue depth Adapter queue depth Storage network (link speed, zoning, subnetting) HBA target queues Array SPs # of disks Disk queue depth Adapter queue depth Adapter type

13. Optimize for Performance – Queue Depth • vSCSI Adapter – Be aware of per device/adapter queue depth maximums (KB 1267) – Use multiple PVSCSI adapters, follow KB 2053145 for large-scale IO intensive SQL deployment (not applicable for typical deployment) • VMKernel Admittance – VMKernel admittance policy affecting shared datastore (KB 1268), use dedicated data store for mission critical SQL Server – VMKernel admittance changes dynamically when SIOC is enabled (recommended for lower-tier SQL Server deployments) • Physical HBAs – Follow vendor recommendation on max queue depth per LUN (http://kb.vmware.com/kb/1267) – Follow vendor recommendation on HBA execution throttle – Be aware settings are global if host is connected to multiple storage arrays – Pick the right multipathing policy based on vendor storage array design CONFIDENTIAL 13

14. Optimize for Performance – Storage Network • Link Type/Speed – FC vs. iSCSI vs. NAS – Latency suffers when bandwidth is saturated • Zoning and Subnetting – Place hosts and storage on the same switch, minimize ISL – Use 1:1 initiator to target zoning or follow vendor recommendation – Enable jumbo frame for IP based storage (MTU needs to be set on all connected physical and virtual devices) – Make sure different iSCSI IP subnets cannot transmit traffics between them CONFIDENTIAL 14

15. VMDK Lazy Zeroing* • Default VMDK allocation policy lazy zeroes 1M VMFS blocks on first write • Write penalty on an untouched VMDK • SQL Server operations could be affected by lazy zeroing – Write operations – Read operations that use tempdb extensively – Bulk load/index maintenance • For best performance, format VMDK as eagerzeroedthick * * Zero offload capability in VAAI improves zeroing in supported arrays CONFIDENTIAL 15 0 20 40 60 80 100 120 140 160 180 200 1 host 2 hosts4 hosts8 hosts 16 hosts Throughput(MBps) Effect of Zeroing on Storage Performance "Post-zeroing" "Zeroing" Choose Storage which supports VMware vStorage APIs for Array Integration (VAAI)

16. SQL Server Data Files • For optimal performance, dedicate data stores / LUNs to Data, TempDB, and Log files – Defaults place data and logs on the same volume…change with ALTER DATABASE -> MODIFY FILE statement – Data and TempDB files can share the same data store / LUN but dedicate a LUN to Log files – Stripe data across as many physical spindles as possible • Use multiple TempDB files – start with 1 TempDB file per CPU core (up to 8) – Files should be of equal size – SQL Server favors allocations in files with more free space (hot spots) • Number of Data files will depend on the size of the database and backup considerations – Or alternately .25 Data files per CPU core • If using storage tiering use the following file placement priority – fastest to slowest drive: – TempDB Data Files > Transaction Log Files > Data Files • Use RAID 10 for log, use RAID 10 or RAID 5 for data, tempdb (not applicable to XtremIO) CONFIDENTIAL 16 Follow Microsoft and Storage Vendor Recommendations!

17. Strict Best Practices SQL Server VM Disk Layout Example Characteristics: • OS on shared DataStore/LUN • 1 database; 4 equally-sized data files across 4 LUNs • 1 TempDB; 4 (1/vCPU) equally-sized tempdb files across 4 LUNs • Data, TempDB, and Log files spread across 3 PVSCSI adapters – Data and TempDB files share PVSCSI adapters • VMDK/DataStores could be RDMs Advantages: • Optimal performance; each Data, TempDB, and Log file has a dedicated VMDK/Data Store/LUN • I/O spread evenly across PVSCSI adapters • Log traffic does not contend with random Data/TempDB traffic CONFIDENTIAL 17 NTFS Partition: 64K cluster size C: D: H: E: I: L: T: DataFile1 .mdf DataFile5 .ndf LogFile1. ldf TmpLog1 .ldf OS ESX Host LUN1 Data Store 1 VMDK1 LUN2 VMDK2 LUN3 VMDK3 LUN4 VMDK4 SQL ServerOS Can be placed on a DataStore/LUN with other OS VMDKs Can be Mount Points under a drive as well. OS VMDK Can also be a shared LUN since TempDB is usually in Simple Recovery Mode PVSCSI1LSI1 F: J: G: K: TmpFile1 .mdf TmpFile2 .ndf TmpFile3 .ndf TmpFile4 .ndf Data Store 2 Data Store 3 Data Store 4 LUN5 VMDK5 LUN6 VMDK6 Data Store 5 Data Store 6 LUN5 VMDK5 LUN6 VMDK6 PVSCSI2 Data Store 5 Data Store 6 LUN5 VMDK5 LUN6 VMDK6 PVSCSI3 Data Store 5 Data Store 6 DataFile3 .ndf DataFile7 .ndf Disadvantages: • You can quickly hit the ESX LUN Limit! • More complicated storage management

18. Realistic SQL Server VM Disk Layout Example Characteristics: • OS on shared DataStore/LUN • 1 database; 8 Equally-sized data files across 4 LUNs • 1 TempDB; 4 files (1/vCPU) evenly distributed and mixed with data files to avoid “hot spots” • Data, TempDB, and Log files spread across 3 PVSCSI adapters • VMDK/DataStores could be RDMs Advantages: • Fewer LUNs used • I/O spread evenly/TempDB hot spots avoided • Log traffic does not contend with random Data/TempDB traffic CONFIDENTIAL 18 NTFS Partition: 64K cluster size C: D: E: F: G: L: T: DataFile1.mdf DataFile2.ndf TmpFile1.mdf DataFile4.ndf DataFile3.ndf TmpFile2.ndf DataFile5.ndf DataFile6.ndf TmpFile3.ndf DataFile7.ndf DataFile8.ndf TmpFile4.ndf LogFile.ldf TmpLog.ldfOS ESX Host LUN1 Data Store 1 VMDK1 LUN2 Data Store 2 VMDK2 LUN3 Data Store 3 VMDK3 LUN4 Data Store 4 VMDK4 LUN5 Data Store 5 VMDK5 LUN6 Data Store 6 VMDK6 SQL ServerOS Can be placed on a DataStore/LUN with other OS VMDKs Can be Mount Points under a drive as well. OS VMDK Can also be a shared LUN since TempDB is usually in Simple Recovery Mode PVSCSI1LSI1 PVSCSI2 PVSCSI3

19. Block Alignment • Configure storage presented to vSphere hosts using vCenter to ensure VMFS block alignment • Misalignment can result in up to 50% performance hit • Windows 2008+ should align sectors by default…double-check! – http://msdn.microsoft.com/en-us/library/dd758814.aspx – http://blogs.msdn.com/b/jimmymay/archive/2014/03/14/disk-partition- alignment-for-windows-server-2012-sql-server-2012-and-sql-server- 2014.aspx (Jimmy May - MSDN Blogs) • For example, OEM setups with recovery partitions could result undesirable starting offsets for the Windows partition CONFIDENTIAL 19 Unaligned partitions result in additional I/O Aligned partitions reduce I/O stripe unit size value should be an integer

20. Memory Optimization

21. Large Pages in SQL Server Configuration Manager (Guest) • Use Large Pages in the guest – ON by default in 2012/2014 if Lock Pages in Memory User Right is granted to SQL Server Service Account (sqlservr.exe) and if the VM has 8+ GB of memory - http://msdn.microsoft.com/en-us/library/ms178067.aspx – For older versions, start SQL Server with trace flag -T834 CONFIDENTIAL 21

22. NUMA Considerations

23. Non-Uniform Memory Access (NUMA) • Designed to avoid the performance hit when several processors attempt to address the same memory by providing separate memory for each NUMA Node. • Speeds up Processing • NUMA Nodes Specific to Each Processor Model • Enable Non-Uniform Memory Access (NUMA) in BIOS – ESXi is NUMA-aware and will schedule vCPUs onto a single NUMA node (if it fits) – SQL Server is NUMA-aware CONFIDENTIAL 23

24. NUMA Best Practices • http://www.vmware.com/files/pdf/techpaper/VMware-vSphere-CPU-Sched-Perf.pdf • Avoid Remote NUMA access – Size # of vCPUs to be <= the # of cores on a NUMA node (processor socket) • Where possible, align VMs with physical NUMA boundaries – For wide VMs use a multiple along with virtual NUMA • Hyperthreading – Initial conservative sizing: set vCPUs equal to # of cores – HT benefit around 20-25%, < for CPU intensive batch jobs (based on OLTP workload tests ) • # of virtual sockets and # of cores / virtual socket: where possible keep default 1 core / socket • ESXTOP to monitor NUMA performance in vSphere – Coreinfo.exe to see NUMA topology in Windows Guest • If vMotioning, move between hosts with the same NUMA architecture to avoid performance hit (until reboot) CONFIDENTIAL 24

25. Non-Wide VM Sizing Example (VM fits within NUMA Node) • 1 vCPU per core with hyperthreading OFF – Must license each core for SQL Server • 1 vCPU per thread with hyperthreading ON – 10%-25% gain in processing power – Must license each thread for SQL Server CONFIDENTIAL 25 “numa.vcpu.preferHT” to true to force 24-way VM to be scheduled within NUMA node SQL Server VM: 24 vCPUs NUMA Node 0: 128 GB Memory 0 1 2 3 4 5 6 7 8 9 10 11 SQL Server VM: 12 vCPUs NUMA Node 0: 128 GB Memory 0 1 2 3 4 5 6 7 8 9 10 11 Hyperthreading OFF Hyperthreading ON

26. SQL Server VM: 24 vCPUs NUMA Node 0: 128 GB Memory 0 1 2 3 4 5 6 7 8 9 10 11 NUMA Node 1: 128 GB Memory 0 1 2 3 4 5 6 7 8 9 10 11 Virtual NUMA Node 1Virtual NUMA Node 0 Hyperthreading OFF Wide VM Sizing Example (VM crosses NUMA Node) • Extends NUMA awareness to the guest OS • Enabled through multicore UI – On by default for 8+ vCPU multicore VM – Existing VMs are not affected through upgrade – For smaller VMs, enable by setting numa.vcpu.min=4 • Do NOT turn on CPU Hot-Add • For wide virtual machines, confirm feature is on for best performance CONFIDENTIAL 26

27. XtremIO Enhancements

28. Common Challenges • Consolidation creates random performance issues • Copying data is common – VMs, databases, analytics • Workflow complexity – downstream data services, lifecycle management CONFIDENTIAL 28 MASSIVE OPPORTUNITY FOR IMPROVEMENT

29. XtremIO All-Flash Storage Array with Rich Data Services CONFIDENTIAL 29 Advantages for SQL Server:  Scaling: Linear, Dynamic for Capacity & IOPs  Performance: Consistent & Predictable at Scale  Workflow: Zero Impact Copy Services  Data-Reduction: In-line and Unstoppable  Enterprise-Ready: Data Protection & Availability  Simplicity: Zero Capacity Planning & Tuning SCALE-OUT CONSISTENT & PREDICTABLE SUB-MS LATENCIES DATA SERVICES INLINE ALL THE TIME MANAGEMENT SIMPLICITY & AUTOMATION

30. Performance – Consistent Low Latency • Consolidate 1, 2, 4, and 8 SQL Server VMs • DB size: ~1TB each • XtremIO dual X-Brick • OLTP like workload, 90% read, 10% write, majority 8K random • Near linear scalability of IOPS • Consistent sub-millisecond avg. disk latency CONFIDENTIAL 30

31. Performance – Increase Consolidation Efficiency • Zero tuning performance enhancement • Reduce of batch run time from 7hrs to 1hr • Opportunity to increase consolidation density with more efficient resource utilization • Maximize return of investment on SQL Server licenses 0 1 2 3 4 5 6 7 8 Traditional Storage XtremIO BatchJobRunTime(hrs) Before and After Customer Study CONFIDENTIAL 31

32. Storage Efficiency • “Zero” optimized – Instant eagerzeroedthick – Zero space for pre-allocated space • Space efficient VM clones, database copies • Automatic compression, full compatibility w/ SQL native compression PHYSICAL CONFIDENTIAL 32 Database Size on VM = 1TB Logical Volume = 610GB Provisioned VMDK = 2TB PHYSICALPhysical = 383GB Thin Provision Zero Optimized Dedupe, Compressed 5.3:1 Overall Efficiency

33. Simplicity – Capacity Planning and Operational Management CONFIDENTIAL 33 DONE! XTREMIO Volume Size RAID group/Number of spindles Storage pool/tiering Number of LUNs Separate data vs. log Tempdb placement Separate OLTP vs. analytics workloads HISTORIC COMPLEXITIES Right sizing: hot vs. active vs. cold

34. DESIGN / DEVELOPUPGRADE TUNE MAINTAIN REPORTING Backup Test/Dev Copies Offload Query Tuning dbcc checkdb App-Consistent Snapshot Backup Reporting Copies Copy for Failback Agility – Enhanced Lifecycle Management w/ Copy Services

35. Demo: Rapid Deployment of AlwaysOn Secondary Replica

36. Monitoring and Troubleshooting

37. Performance Needs Monitoring at Every Level CONFIDENTIAL 37 Application Guest OS ESXi Stack Physical Server Connectivity Peripherals Application Level App Specific Perf tools/stats Guest OS CPU Utilization, Memory Utilization, I/O Latency Virtualization Level vCenter Performance Metrics /Charts Limits, Shares, Virtualization Contention Physical Server Level CPU and Memory Saturation, Power Saving Connectivity Level Network/FC Switches and data paths Packet loss, Bandwidth Utilization Peripherals Level SAN or NAS Devices Utilization, Latency, Throughput START HERE

38. Virtual Machine Storage LUN Physical Disks Guest OS disk VMware Data store (VMFS Volume) .vmdk file Storage Array Logical Storage Layers: from Physical Disks to vmdks CONFIDENTIAL 38 KAVG • Tracks latency of I/O passing thru the Kernel • Investigation Threshold: 1ms DAVG • Tracks latency at the device driver; includes round-trip time between HBA and storage • Investigation Threshold: 15 - 20ms, lower is better, some spikes okay Aborts (ABRT/s) • # commands aborted / sec • Investigation Threshold: 1 GAVG • Tracks latency of I/O in the guest VM • Investigation Threshold: 15-20ms KB Article Link: http://kb.vmware.com/selfservic e/microsites/search.do?langua ge=en_US&cmd=displayKC&e xternalId=1008205

39. In-guest SQL Server Performance Monitoring • Perfmon – SQL Server specific counters: SQLServer:** – VMware Tools includes a Perfmon DLL that provides visibility into host CPU, memory, and disk usage • SQL Server Extended Events: https://technet.microsoft.com/en-us/library/bb630282(v=sql.105).aspx • SQL Server Profiler – Monitor SQL Server performance at T-SQL statement level • SQL Server Dynamic Management Views (DMVs) – Monitor the internal health of SQL Server – Sys.dm_* • SQL server Replay https://msdn.microsoft.com/en-us/library/ff878183.aspx CONFIDENTIAL 39

40. Consolidating Multiple SQL Server Workloads

41. Consolidation Options CONFIDENTIAL 41 • Scale-up approach – Multiple instances per VM – Fewer virtual machines – More complex workload management • Use Min Server and Max Server memory OR Resource Governor – Potential reduction in SQL Server licensing cost • Scale-out approach – Single instance per VM – Potential increase in mgmt. overhead – Better isolation/performance – Easier security and change mgmt. – DRS more effective with smaller VMs – Faster migration (vMotion) 41

42. Running with Mixed SQL Server Workloads • Consider workload characteristics, and manage pCPU overcommitment as a function of typical utilization – OLTP workloads can be stacked up to a sustained utilization level – OLTP workloads that are high usage during daytime and batch workloads that run during off-peak hours mix well together – Batch/ETL workloads with different peak periods are mixed well together • Consider operational history, such as month-end and quarter-end – CPU and memory Hot Add can be used to scale up VMs – Additional VMs can be added to handle peak periods if scale out is a possibility – Reduce virtual machine density, or add more hosts to the cluster CONFIDENTIAL 42

43. OLTP vs. Batch Workloads What this says: • Average 15% Utilization • Moderate sustained activity (around 28% during working hours 8am-6pm) • Minimum activities during none working hours • Peak utilization of 58% What this says: • Average 15% Utilization • Very quiet during the working day (less than 8% utilization) • Heavy activity during 1am-4am, with avg. 73%, and peak 95% Batch Workload (avg. 15%) OLTP Workload (avg. 15%) CONFIDENTIAL 43

44. SQL Server Availability

45. vSphere Availability Features • vSphere vMotion – Can reduce virtual machine planned downtime – Relocate SQL Server VMs without end-user interruption – Perform host maintenance any time of the day • vSphere DRS – Monitors state of virtual machine resource usage – Can automatically and intelligently locate virtual machine – Can create a dynamically balanced SQL deployment • VMware vSphere High Availability (HA) – Does not require Microsoft Cluster Server – Uses VMware host clusters – Automatically restarts failed SQL virtual machine in minutes – Heartbeat detects hung virtual machines – Application HA can provide availability at the SQL Server service level! CONFIDENTIAL 45

46. Microsoft Clustering on VMware vSphere support VMware HA support vMotion DRS support Storage vMotion support MSCS Node Limits Storage Protocols support Shared Disk FC In- Guest OS iSCSI Native iSCSI In- Guest OS SMB FCoE RDM VMFS Shared Disk MSCS with Shared Disk Yes Yes1 Yes No 5 2 (pre-5.1 only) Yes Yes No Yes5 Yes4 Yes2 Yes3 Exchange Single Copy Cluster Yes Yes1 Yes No 2 5 (5.1 only) Yes Yes No Yes5 Yes4 Yes2 Yes3 SQL Clustering Yes Yes1 Yes No 2 5 (5.1 only) Yes Yes No Yes5 Yes4 Yes2 Yes3 SQL AlwaysOn Failover Cluster Instance Yes Yes1 Yes No 2 5 (5.1 only) Yes Yes No Yes5 Yes4 Yes2 Yes3 Non shared Disk Network Load Balance Yes Yes1 Yes Yes Same as OS/app Yes Yes Yes N/A Yes N/A N/A Exchange CCR Yes Yes1 Yes Yes Same as OS/app Yes Yes Yes N/A Yes N/A N/A Exchange DAG Yes Yes1 Yes Yes Same as OS/app Yes Yes Yes N/A Yes N/A N/A SQL AlwaysOn Availability Group Yes Yes1 Yes Yes Same as OS/app Yes Yes Yes N/A Yes N/A N/A vMotion with Shared Disk Configurations: Requires Hardware 11 Compatibility (vSphere 6.0) Physical Mode Required for vSCSI Controller Non-Shared Disk Configurations: No VMware Restrictions * Use affinity/anti-affinity rules when using vSphere HA VMware Knowledge Base Article: http://kb.vmware.com/kb/1037959 Support for Microsoft Clustering on vSphere CONFIDENTIAL 46

47. vSphere HA with Shared Disk Clustering • Supports up to five-node cluster in vSphere 5.1 and above • Host attach (FC) , FCoE* or in-guest (iSCSI) • Supports RDM only – RDMs can be vMotioned in vSphere 6.0!!! – Use DRS affinity/anti-affinity rules to avoid running cluster virtual machines on the same host • vSphere HA + failover clustering – Seamless integration, virtual machines rejoin clustering session after vSphere HA recovery – Can shorten time that database is in unprotected state CONFIDENTIAL 47 Failover clustering supported with vSphere HA since vSphere 4.1 http://kb.vmware.com/kb/1037959 vSphere Cluster 1 – HA-enabled SQL Server Databases Normal Operation Physical disks do not move. vSphere Cluster 1 – HA-enabled SQL Server Databases Cluster Failover DB Failover Physical disks do not move. vSphere Cluster 1 – HA-enabled SQL Server Databases Recovery HA Reboots Physical disks do not move.

48. vSphere HA with AlwaysOn Availability Groups • Seamless integration • Protect against hardware/software failure • DRS anti-affinity rule avoids running virtual machines on the same host • Support multiple secondary and readable secondary • Provide local and remote availability • Full feature compatibility with availability group • vSphere HA + failover clustering – Seamless integration, virtual machines rejoin clustering session after vSphere HA recovery – Can shorten time that database is in unprotected state CONFIDENTIAL 48 Witness Direction of data flow vSphere Cluster 1 – HA-enabled SQL Server Databases Normal Operation Full Quorum vSphere Cluster 1 – HA-enabled SQL Server Databases Cluster Failover DB Failover Witness-to-Partner Quorum vSphere Cluster 1 – HA-enabled SQL Server Databases HA Recovery HA Reboots Full Quorum

49. Resources • Visit us on the web to learn more on specific apps – http://www.vmware.com/solutions/business-critical-apps/ – Specific page for each major app – Includes Best Practices and Design/Sizing information • Visit our Business Critical Application blog – http://blogs.vmware.com/apps/ CONFIDENTIAL 49

50. Questions? CONFIDENTIAL 50

51. Advanced SQL Server on vSphere Scott Salyer, VMware, Inc Wanda He, EMC VAPP5598 #VAPP5598

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