Performance and Sizing Considerations
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1 Performance and Sizing Considerations TRW Automotives Chin, Kar Wai Global DC Services Delivery Manager karwai.chin@trw.com
2 Performance and Sizing Considerations Understanding what s a Virtual Machine Candidate Selections Building your application on VM e.g. Exchange, SAP Sizing/Performance consideration for your VM Support from major ISV Building a solid foundation with VMware Plan & Design
3 Anatomy of a Virtual Machine Each Virtual Machine is a complete system encapsulated in a set of software files Unmodified Application Virtual Machines Unmodified OS ESX Server Virtual Hardware (X86) Physical Server
4 Candidate Selections Non-Candidates Poor-Candidates Candidates requires additional resources Virtualizable Candidates
5 Candidate Selections Non-Candidates Application requires more resources than can be made available to a single Virtual Machine more than 4 active NIC ports, more than 64GB RAM, more than 4 physical CPUs df OS supportability
6 Candidate Selections Application which uses specialized peripherals not supported in Virtual Machines such as fax server cards, modems, encryption cards, other specialized PCI/expansion cards, some dongles; Application which uses specialized peripherals for licensing which are not supported in VM s such as fax server cards, modems, encryption cards, video capture cards, other specialized PCI/expansion cards, some dongles;
7 Candidate Selections Poor-Candidates Applications that require a serial connector, or parallel port connector for the licensing Can mount port to VM, but locked to specific host, No Vmotion Tape Backup Server SCSI attached Only Adaptec SCSI adapters Generally highly utilized - CPU, Memory, Network and Disk True Real-time application one clock cycle to one event Applications that use hard-core 3D graphics
8 Candidate Selections Candidates requires additional resources Applications that require a USB key for licensing USB over IP e.g. AnywhereUSB (Digi) Applications that use licensing to a specific MAC address can set a static MAC address in the VM s configuration file (.vmx)
9 What about the rest?
10 >95% Applications Are good candidates for running on VMware Infrastructure
11 Building your Application on VM
12 >95% of Applications Match or Exceed Native Performance on VMware Infrastructure 100% Proportion of Apps Performing Well Overhead VM CPU VM Memory IO ESX 2 ESX 3 ESX 3.5 Future 30% - 60% 20% - 30% <10% - 20% <2% - 10% 1 vcpu 2 vcpu 4 vcpu 8 vcpu 3.6 GB 16 GB 64 GB 256 GB <10,000 IOPS 100,000 IOPS >200,000 IOPS 380 MBits 800 MBits 9 GBits 40 GBits ESX Versions
13 Support Large Oracle Databases Disk IO per Second Database Requirements vs. VI Capacity 100K 80K 60K 40K 100,000 VI supports 80X IO throughput requirement of average 4-CPU Oracle Database 20K 1,200 DB requirements (4-CPU Oracle DB) VI Capacity Source: VMware Capacity Planner analysis of > 700,000 servers in customer production environments
14 # SD Users Run SAP with <10% Overhead % overhead 270 SAP SD Benchmark 480 7% overhead % overhead 732 Native VMware Native VMware Native VMware CentraI Instance & DB 1 vcpu 4 Gb CentraI Instance & DB 2 vcpu 8 Gb CentraI Instance & DB 4 vcpu 16 Gb
15 12-Dec-2007: SAP Support for VMware Production Support for Windows and Linux VMware now a SAP Global Technology Partner [.]
16 Server Sprawl Typical Development SAP Deployment Training Dev QA / Test Production
17 The Dynamic SAP Datacenter SAP ERP Resource Pool SAP BI Resource Pool Test & Dev Resource Pool SAP HR SAP ERP SAP ERP SAP CRM SAP BI Test & Dev Test & Dev Application Servers Application Servers Application Servers Application Servers Application Servers Application Servers Application Servers Windows 64 Bit SuSE Linux Red Hat Linux Windows 2003 Server Red Hat Linux 64 Bit Windows 64 Bit Windows 2000 Server Virtual Machine Virtual Machine Virtual Machine Virtual Machine Virtual Machine Virtual Machine Virtual Machine SAP HR System SAP ERP Cluster SAP Business Intelligence SAP Test & Development Systems VMware VMotion Technology VMware ESX Server VMware ESX Server VMware Infrastructure Storage Network Servers
18 SAP Sizing - Guidelines Start with small units. Smaller units are better manageable and load balancing is easier. Scale-out instead of scale-up. e.g. deploy additional Application Servers if necessary Virtualization may not fit every customer, but often leaving a highly utilized Database on a native host and virtualising the remaining components is a viable option. SD Benchmark results are around 400 SD users for 2 vcpu with 8GB and around 700 SD users for 4 vcpu with16gb.
19 Sizing and Performance Considerations
20 Sizing Considerations Basic Concepts - CPU CPU Performance Virtual CPUs map to physical CPU cores Multi-vCPUs from a single VM must be scheduled simultaneously Configure only as many vcpus as needed Impose unnecessary scheduling constraints on ESX Server Waste system resources (idle looping, etc.) Idle vcpus will compete for system resources Unavailable pcpus can result in VM ready time. # of total vcpus + 1 <= # of total cores per ESX hosts (High-Performance) Ensure application is support for multithread if assign multiple Vcpu to single VM
21 Sizing Considerations A - 0 A - 1 CPU-0 CPU-1 CPU-2 CPU-3 B - 0 E - 0 Schedule - 1 C- 0 C- 1 D- 0 D- 1 Schedule - 2 A - 0 A - 1 B - 0 E - 0 Schedule - 3 Contending for CPU resources!
22 Sizing Considerations A - 0 A - 1 B - 0 E - 0 CPU-4 C- 0 CPU-5 C- 1 CPU-6 D- 0 CPU-7 D- 1 Schedule - 1 CPU-0 CPU-1 CPU-2 CPU-3 Optimized VM ratio to pcpu on host!
23 Sizing Considerations Basic Concepts - Memory Memory Performance Service Console: 272 MB VA VMkernel: 100 MB+ Per-VM memory space overhead increases with: Number of VCPUs Size of guest memory PA Do not over allocate for intensive workloads MA
24 Sizing Considerations Basic Concepts - Networking Networking Performance NIC teaming Use separate NICs to avoid contention Use same virtual switch to connect communicating VMs Use vmxnet virtual device in guest Requires CPU cycles Virtual Machines Virtual NICs VSwitch VM3 Physical NICs Mbps Mbps Mbps ESX Server VSwitch Physical Switches
25 Performance Considerations - VM Network Virtual Switch Separate multiple subnet into different virtual switch Reduce network hoop from each virtual switches to improve network efficiency Proper planning on network infrastructure and VM guest IP address and subnet Standardize Virtual Switch name for HA, DRS and VMotion purposes
26 Performance Considerations - VM Network Ensure Physical Network Cards is slotted at PCI-X to improve network performance Separate the VM network traffic from Service Console and VMkernel Reside the VMs which require connectivity to each others into same virtual switches to improve efficiency Multiple mode of the physical NIC must match with the switch configuration
27 Virtualization Storage Best Practices Standardize the VMFS datastore size with storage best practices recommended by different storage vendors Avoid high intensive I/O workload VM guests access to the same datastore at the same time Assign separate Virtual Disks and Virtual Controller if require for better management capability and performance purpose Select RDM for huge storage requirement in single volume Avoid extra multi path if do not require as it will impact the total numbers of LUNs to be presented to each ESX hosts Create separate VMkernal for Software ISCSI adaptor or select the right ISCSI HBA cards for ISCSI storage protocol Sufficient Swap Space require in each datastore to ensure the allow the memory over commit on ESX servers
28 Round Robin Round Robin Load Balance across all available paths Improve I/Os throughput Avoid Bottleneck on dedicated path for performance perspective Experimental at current ESX 3.5
29 Performance Considerations - Memory Reservation Memory Reservation Increase physical memory respond time Improve data processing efficiency Share value impact the resources priority to VM Only reserve if needed
30 Performance Considerations - CPU Reservation CPU Reservation CPU reserve for High CPU contending VM Improve performance Reduce available CPU processing power to the rest of VM on same ESX Host Only reserve the amount which needed Shares value will impact the prioritization of VM in the ESX host
31 Performance Considerations - Advance CPU CPU Reservation Keep the setting to default for hyper threaded core sharing Scheduling Affinity allow specify Vcpu to be assigned to specify physical Core in ESX servers Distribute workload to underutilize physical cores if needed Recommended to keep as default setting
32 Performance Considerations - DRS Best Practices Reside VMs which require communication in same host will reduce communication latency Separate VMs with same functionality to different hosts to maintain maximum availability Right aggressive mode for migration threshold and fully automate Enable EVC to improve VMotion Capability
33 Time Synchronization Why is it so important? MS Kerberos implementation allows a 5 minute tolerance Active Directory operations are critically time dependent File Replication Services (FRS) synchronizes scripts, database changes/updates, policies based, in part, on time-stamping
34 Time Synchronization No CPU cycles needed none given! Clock drifts can be significant in a relatively short period Idle cycles in a virtual machine is an Active Directory domain s worst enemy How do you combat time synchronization issues? More than a 28 minute drift!
35 Time Synchronization Option A Using W32Time Use Windows Time Service NOT VMware Tools Microsoft KB article # provides instructions for this process 1. Modify registry settings on the PDC emulator for the forest root domain: HKLM\System\CurrentControlSet\Services\W32Time\Parameters Change Type REG_SZ value from NT5DS to NTP Change NtpServer value from time.windows.com,0x1 to an external stratum 1 time source, i.e. tock.usno.navy.mil,0x1 HKLM\System\CurrentControlSet\Services\W32Time\Config Change AnnounceFlags REG_DWORD from 10 to 5 2. Stop and restart time service net stop w32time net start w32time 3. Manually force update w32tm /resync /rediscover
36 Time Synchronization Option B VMware Tools Modify Windows Time Service Use VMware Tools Implement Domain Controllers Group Policy to modify registry: Modify Enable ESX server NTP daemon to sync with external stratum NTP source VMware Knowledge Base ID# 1339 Enable ESX server NTP daemon to sync with external. Use VMware Tools time synchronization within the virtual machine NOTE: VMware Tools time sync is designed to play catch-up, not slow down!
37 Time Synchronization - Summary Use one method or the other Do NOT use both!!! Decisions should be based on current time management infrastructure or organization s policies Ensure Multiple NTP servers synchronize option is been Ensure Multiple NTP servers synchronize option is been configured on each ESX Host
38 Exchange and MS SVVP Ong, Kok Leong Senior Consultant, VMware ASEAN e klong@vmware.com m w
39 Double Capacity of Exchange 2007 Hosts Native VMware Infrastructure 8 VM 16 core 128 GB 16 core 128 GB 8K mailboxes 16K mailboxes
40 Proving to be Better Than Native The experiment: 2,000 user Exchange multi-role VMs The hardware: IBM x3850 M2 4 x quad-core Intel Xeon G RAM The criteria: LoadGen test pass
41 Scaling Exchange (Natively) On a Single Server 8 Cores Max
42 Single-Server Native Exchange Scaling 16K 14K 12K Mailboxes 10K 8K 6K 8 core max 5M/mailbox perf. threshold Outside of Microsoft recommendations 4K 2K Highest Performance CPUs (or cores)
43 Multi-VM Scaling of Exchange on VI3 16K 14K 12K Building blocks stay within Microsoft recommendations: 1,000 mailboxes/core 5MB/mailbox Three building blocks breaks through previrtual memory boundaries Mailboxes 10K 8K 6K 4K 2K Maximum performance! 5 MB/mailbox perf. threshold Eight core limit recommended by Microsoft CPUs (or cores) Five building blocks shatters pre-virtual CPU limitations Eight building blocks enables 16,000 users VI3 provides native-matching performance and complete resource utilization
44 Exchange Sizing Considerations Considerations Do not over-commit pcpus when running Exchange VMs. Do not over-allocate vcpus; try to match the exact workload. If the exact workload is unknown, start with fewer vcpus initially and increase later if necessary. Memory pages can be shared across VMs that have similar data (e.g. same guest OS) Memory can be over-committed, (i.e. allocating more memory to VMs than is physically available on the ESX Server) Ensure heavily-used VMs not all accessing same LUN concurrently.
45 Microsoft Support and Licensing for VMware MS Licensing Allows VMotion > Reassign licenses between servers as frequently as needed > Covers 41 server apps including > Exchange 2007 > SQL Server 2008 > SharePoint 2007 > Dynamics CRM 4.0 MS Support for Apps on ESX > ESX validated as part of Microsoft SVVP program > Microsoft ensures same technical support on ESX as on physical servers for Windows and the 33 apps > Exchange 2007 > SQL Server 2008 > SharePoint 2007 > Dynamics CRM 4.0
46 MS SVVP What does validation mean? Customers will now get corporate support from MS when running Windows Server on ESX 3.5 U2/U3 Windows Server 2008, Windows 2000 Server Service Pack 4, Windows Server 2003 Service Pack 2 and subsequent service packs are supported Any version of Windows back to Windows Server 2000 SP4 is also supported, including all OS roles such as Active Directory, File Services, etc VMware has a premier support contract with MS and can escalate issues to MS Support on a customer s behalf. VMware Confidential
47 MS VSSP What about the MS Applications? As part of VSSP, Microsoft has published a list of MS Applications that are supported. Article ID: Microsoft Application Virtualization (App-V) Microsoft Operations Manager (MOM) 2005 Microsoft BizTalk Server Microsoft Search Server Microsoft Commerce Server Windows Essential Business Server 2008 Microsoft Dynamics AX Windows Small Business Server 2008 Microsoft Dynamics CRM Microsoft SQL Server 2005 and SQL Server 2008 Microsoft Dynamics NAV Microsoft Exchange Server Microsoft Forefront Client Security Microsoft Intelligent Application Gateway (IAG) Microsoft Forefront Security for Exchange (FSE) Microsoft Forefront Security for SharePoint (FSP) Microsoft Host Integration Server Microsoft System Center Configuration Manager Microsoft System Center Data Protection Manager Microsoft System Center Essentials Microsoft System Center Operations Manager Microsoft System Center Virtual Machine Manager Microsoft Systems Management Server (SMS) Microsoft Visual Studio Team System Microsoft Internet Security and Acceleration (ISA) Server Microsoft Windows HPC Server 2008 Microsoft Office Groove Server Microsoft Office Performance Point Server Windows Server 2003 Web Edition Microsoft Windows Server Update Services (WSUS) Microsoft Office Project Server Windows Web Server 2008 Microsoft Office SharePoint Server and Windows SharePoint Services
48 Expanding ISV Ecosystem McKesson
49 Additional Resources Visit us on the web to learn more on specific apps Best Practices, Reference Architectures, and Case Studies Microsoft Apps (Exchange, SQL, SharePoint) Oracle SAP Microsoft server software and supported virtualization environments
50 VMware - Plan and Design Service Comprehensive VI architecture design for implementation Avoid implementation pitfalls that can stall or slow deployment Accelerate the achievement of virtual infrastructure benefits Project Kickoff Data Collection Capacity and Financial Analysis Assessment Deliverable Week 1 Week 2 Week 3 Week 4 Week 5 Design Sessions Creation of Deliverables Architectural Design Assembly & Configuration Guide Standard Procedures Test Plan & Rollout Plan Final Recommendations Week 6 Week 7 Week 8 Week 9 Week 10
51 Start with Capacity Planner VMware Capacity Planner is Business and decision support tool To perform faster, more accurate and benchmarked consolidation assessments Capacity Planner provides: Complete state of the datacenter (As-Is) Comprehensive future state consolidation recommendation and roadmap (To-Be)
52 Thank You ONG, Kok Leong Senior Systems Consultant e klong@vmware.com m +60 (12) w
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