HigHly AvAilAble virtuAlizAtion WitH Microsoft Hyper-v And ...


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HigHly AvAilAble virtuAlizAtion WitH Microsoft Hyper-v And ...

  1. 1. feature section: Virtualization and flexible computing HigHly AvAilAble virtuAlizAtion WitH Microsoft Hyper-v And scvMM 2008 By Ray Weinstein In virtualized environments, high availability can be critical Burk Buechler to avoiding lost revenue, maintaining productivity, and protecting data from system failure. Combining Microsoft® Hyper-V™ technology with Microsoft System Center Virtual Machine Manager (SCVMM) 2008 on Dell™ platforms can help organizations create highly available virtualized systems while offering simplified management, dynamic performance, workload optimization, and reduced costs. V irtualization solutions can offer significant implementing holistic virtualized solutions. A com- benefits, helping boost IT efficiency and prehensive virtualized environment, however, goes capacity and providing a robust, simplified beyond consolidation to take advantage of the environment while also helping significantly reduce encapsulation and portability of VMs as well as flex- costs. However, virtualization can also create single ible, powerful management tools. These features points of failure in critical environments: for example, enable administrators to use virtualization to help if an enterprise is running 10 production workloads increase availability, manage workloads effectively on 10 separate physical servers, the failure of a single without overprovisioning hardware, and implement Related Categories: server would likely be inconvenient but not disas- disaster recovery plans. High availability (HA) trous. However, in a virtualized environment with 10 Microsoft Hyper-V technology and Microsoft Hypervisor software production workloads running in 10 virtual machines System Center Virtual Machine Manager (SCVMM) Microsoft (VMs) on a single physical server, the failure of that 2008 provide the core foundational components of Virtualization server could be catastrophic. a comprehensive solution, helping organizations sim- Visit DELL.COM/PowerSolutions In addition, computing systems have become plify virtualized IT infrastructures, reduce costs, and for the complete category index. such an integral part of enterprise environments that increase availability. With integrated administration, severe consequences can occur when the systems administrators can use a single console to help cen- become unavailable. When critical functions such as tralize management of a heterogeneous VM infra- the Microsoft Active Directory® directory service, the structure, increase physical server utilization, quickly Microsoft Exchange messaging platform, or Microsoft provision new VMs, and provide dynamic perfor- Office SharePoint® Server services are not accessible, mance and resource optimization of hardware, oper- enterprises may face lost revenue, lost productivity, ating systems, and applications. Dell can help reduced customer satisfaction, data loss, or even enterprises implement these features to extend their diminished decision-making capabilities. As a result, use of virtualization and help provide enhanced ser- these computing systems must be available 24/7. vice levels, responsiveness, and enterprise agility (see Introductory virtualization projects often focus the “Microsoft Hyper-V in the real world” sidebar in on reducing capital expenses rather than on this article). 22 DELL POWER SOLUTIONS | November 2008 Reprinted from Dell Power Solutions, November 2008. Copyright © 2008 Dell Inc. All rights reserved.
  2. 2. Quick migration In assessing the cost-effectiveness of a high-availability environment, administra- tors must balance the cost of downtime against the cost of a proposed solution. The first consideration to help minimize failures should be the quality and reliability of serv- ers and storage. To this end, Dell servers and storage incorporate a broad array of redundant features designed to maximize availability. High-availability clusters can provide the additional level of availability required for critical applications. Hyper-V takes this a step further by introducing an advanced level of integration between the Microsoft Windows Server® 2008 clustering Figure 1. Microsoft Hyper-V quick migration feature and the Hyper-V quick migration feature (see Figure 1). applications to be cluster aware; the a Hyper-V environment. Cluster services The quick migration feature can help Windows Server 2008 clustering feature within the guest OS manage the failover at increase the availability and flexibility of manages the failover at the host level. This the VM level. Guest clustering requires that critical services during planned downtime capability enables applications that tradi- host systems be running Windows Server for maintenance, or quickly restore ser- tionally have been incompatible with clus- 2008 Enterprise x64 Edition or Datacenter vices after unplanned downtime. It enables tering to become highly available with little x64 Edition using a full or Server Core administrators to rapidly fail over a run- or no additional configuration or modifica- installation. VMs can run any cluster- ning VM from one physical host to another tion. Host clustering requires that host sys- enabled Windows server OS (Windows with minimal downtime. tems be running Windows Server 2008 2000 Server, Windows Server 2003, or Enterprise x64 Edition or Datacenter x64 Windows Server 2008). In addition, guest Host clustering Edition using a full or Server Core installa- clustering requires cluster-aware applica- and guest clustering tion. VMs can run any guest OS supported tions such as the Microsoft SQL Server® Hyper-V provides two different clustering by Hyper-V (see the “Microsoft Hyper-V 2008 Enterprise Edition database platform options—host clustering and guest guest OS support” sidebar in this article). or the Microsoft Exchange Server 2007 clustering—which can be used separately Guest clustering is less common than Enterprise Edition messaging platform. or together. Host clustering is the more host clustering, but takes a similar approach Because this approach contains the clus- common of the two. It enables VM host- to the one used to cluster other Microsoft tered applications within a VM, it also to-host failover without requiring the Windows® OS–based applications outside enables ancillary benefits such as increased Microsoft Hyper-v in tHe reAl World Two companies currently benefiting from highly available Microsoft Hyper-V Hyper-V, we’ll essentially eliminate downtime, which is important as we solutions from Dell are Maxol Group, a venerable Irish-owned oil company, move into several e-commerce ventures that require high reliability.” and HotSchedules, which provides a leading software-as-a-service (SaaS) HotSchedules. High availability is a critical requirement for labor scheduling and workforce management system. The Dell Infrastructure HotSchedules. Dell helped the company’s IT group design a virtualized Consulting team helped deploy both solutions as part of the Microsoft Rapid infrastructure based on Hyper-V failover clusters. “We currently have 2,400 Deployment Program for Hyper-V in advance of the product launch. client installations online. We could very well triple that number in the next Maxol Group. Maxol takes advantage of Hyper-V to help increase the year, just by adding a few large chains,” says Ray Pawlikowski, president of reliability of its data centers. “We can keep all our virtual machines avail- HotSchedules. “With the Dell infrastructure running Hyper-V, we could easily able at all times,” says Nicholas Merton, a member of the IT support team at deploy 120 virtual servers on just 12 physical machines to accommodate that Maxol Dublin. “If anything happens to one server, the cluster automatically growth without maxing out our data center. The new infrastructure lets the moves the affected workloads to a new server, transparent to users. With business pursue those large clients with confidence.” Reprinted from Dell Power Solutions, November 2008. Copyright © 2008 Dell Inc. All rights reserved. DELL.COM/PowerSolutions 23
  3. 3. feature section: Virtualization and flexible computing Microsoft Storage fabric VM LAN Management network Hyper-v VM VM VM VM VM VM VM VM VM VM VM VM guest os Microsoft Windows Server 2008 Microsoft Windows Server 2008 Microsoft Windows Server 2008 Dell PowerEdge™ R805 server Dell PowerEdge R805 server Dell PowerEdge R805 server Microsoft SCVMM 2008 Dell PowerEdge 1950 III server support Microsoft Hyper-V virtual machines (VMs) can run any supported guest OS that has Network switch Network switch Network switch Network switch been validated and granted integration com- Network switch ponent support. Integration components are Dell PowerVault MD3000i iSCSI SAN array Clients sets of drivers and services designed to pro- Dell PowerVault MD1000 expansion enclosure vide additional device support within VMs, Management station help maintain consistent VM states, and enhance guest OS performance by enabling Figure 2. Example Dell high-availability reference configuration the guest OS to use synthetic devices. Inte- from one or more clustered nodes to one best practices for Hyper-V gration components included with Hyper-V or more other available nodes. These HigH aVailability include a VMBus driver to provide transport failovers are most commonly used during Implementing Hyper-V high-availability for synthetic devices, time synchronization to maintenance windows or to provision a solutions can be challenging even for keep VM clocks synchronized with the root workload across clustered nodes. The experienced IT administrators. Dell helps partition, mouse integration, a video driver, a Hyper-V quick migration feature saves the simplify the adoption of this technology synthetic network driver, and synthetic stor- state of a running VM by writing the VM by introducing tools and services such as age drivers. memory to disk on shared storage, moves support matrices, reference configura- For a list of the latest guest operat- the storage ownership from one node to tions (see Figure 2), the Dell Virtualization ing systems supported by Hyper-V, visit another, and then restores the VM state on Advisor tool, and services from the Dell the second node. The failover speed Infrastructure Consulting team. www.microsoft.com/windowsserver2008/en/ depends on several factors, including Necessary cluster components and us/hyperv-supported-guest-os.aspx. amount of memory, storage and intercon- dependencies include the following: nect performance, and even the guest OS hardware utilization, quick and intelligent version used in the VM. In a typical environ- ■■ Host nodes: Each Hyper-V cluster uses provisioning, and increased availability ment, failover would generally complete in 2–16 compliant physical servers to host options. 15–120 seconds. VM workloads. These servers should SQL Server and Exchange can be made Conversely, an unplanned failover run Windows Server 2008 Enterprise highly available in a number of ways, each occurs without administrative interaction x64 Edition or Datacenter x64 Edition with its own particular considerations. and typically results from a hardware to host the failover clustering feature Administrators should weigh the advan- device failure or power outage. In the case as well as the Hyper-V role. The guest tages and disadvantages of each approach of unplanned downtime, the workload VMs can run any combination of client- carefully before deciding on a specific plan. state cannot be saved; instead, the or server-based operating systems The Dell Infrastructure Consulting team can resources written to the disk would be currently supported with Hyper-V. provide expert guidance to help organiza- failed over from the shared storage auto- ■■ Shared storage: Shared storage should tions design a suitable custom solution. matically based on administrator-defined be provisioned to support the clusters. options. The duration of the service This requirement is delivered on planned failoVer outage is typically longer than that of a Internet SCSI (iSCSI)– or Fibre Channel– and unplanned failoVer planned failover because the VMs must based storage area networks (SANs) In addition to understanding the two types complete the entire boot sequence rather with high-performance hard disks. of clustering options, administrators should than the saved state sequence used in a Direct attach storage (DAS) can also also be sure they understand the two types planned failover. (Both VMware® VMotion ™ be added on Dell PowerVault™ MD3000 of failover events: planned failover and technology and the Hyper-V quick migra- enclosures. Windows Server 2008 unplanned failover. A planned failover is an tion feature must reboot guest VMs fol- provides connectivity natively for iSCSI administrator-invoked migration of VMs lowing an unplanned failover.) through the Microsoft iSCSI Software 24 DELL POWER SOLUTIONS | November 2008 Reprinted from Dell Power Solutions, November 2008. Copyright © 2008 Dell Inc. All rights reserved.
  4. 4. Initiator, while the Microsoft Multipath quorum in previous Windows Server As of August 2008, Microsoft has radi- I/O framework helps make SAN con- versions) model in most single-site cally changed its policies for the most com- nectivity straightforward to configure cluster deployments. Defer to the stor- monly used Microsoft applications—including and helps increase availability. age vendor for the optimal selection. SQL Server, Exchange, and the System ■■ Network interconnects: Hyper-V clus- ■■ Use Server Core deployments as often Center family—to provide support in virtual- ters require network interconnects for as possible for host servers and/or ized environments. These support changes a series of objectives and dependen- VMs. In addition to providing adminis- apply not only to Hyper-V, but to hyper- cies. These dependencies include net- trative benefits, VMs using Server Core visors from other vendors as well. For work interface cards (NICs) for parent, installations can fail over significantly Microsoft to support its applications on guest, or iSCSI interconnects; host bus faster than VMs using comparably con- hypervisors from other vendors, these ven- adapters (HBAs) for Fibre Channel– figured full installations with a graphi- dors must participate in the Microsoft based storage; and Serial Attached cal user interface. In addition, because Server Virtualization Validation Program.2 SCSI (SAS) adapters for DAS arrays. Server Core installations typically ■■ Other dependencies: Administrators require less memory and hard disk simplified HigH aVailability should also know the requirements of resources than full installations, the for Virtualized enVironments their particular environment, which may same host space can support addi- Microsoft Hyper-V technology combined include Active Directory domain services, tional VMs. with SCVMM 2008 can provide organiza- Domain Name System (DNS), TCP/IP ■■ For hard disks, provision one or more tions with flexible, highly available virtu- addressing, and appropriate credentials. discrete logical units (LUNs) to each alization for Dell platforms. By deploying VM to enable individualized VM failover. these tools and taking advantage of Dell best practices for implementing Use tools such as Sanbolic Kayo if clus- expert guidance from the Dell Infrastructure highly available systems based on Hyper-V ter file systems and multiple VMs per Consulting team, enterprises can move include the following: LUN are necessary. In addition, use beyond basic hardware consolidation highly available mount points for toward a holistic virtualized environment ■■ Use servers that carry the “Designed implementing more than 21 drive let- designed for simplified management, for Windows” logo. ters (LUNs) within a cluster, and use dynamic performance and resource opti- ■■ Use SCVMM 2008 to manage complex fixed virtual hard disks for optimal flex- mization, and reduced infrastructure and solutions and help ensure intelligent ibility and enhanced performance. operational costs. workload provisioning. ■■ For scalable solutions, add a single ■■ Use tools such as PlateSpin PowerRecon dedicated Gigabit Ethernet NIC port Ray Weinstein is a global practice lead for to assess and establish baselines for the for every four VMs, depending on indi- the Dell Infrastructure Consulting Microsoft physical environment’s performance vidual VM network I/O requirements. Practice. requirements before proceeding with a These guest network NIC ports are in virtualization implementation. addition to the other required ports Burk Buechler is a senior global product ■■ Install the latest Microsoft Quick Fix recommended for Hyper-V parent par- manager for the Dell Infrastructure Engineering (QFE) updates for Hyper-V tition accessibility, cluster heartbeats, Consulting Microsoft Practice. and clustering through Windows and iSCSI connectivity (if required).1 Server Update Services. ■■ Validate that the shared storage solution microsoft support for is compliant with both Windows Server Virtualized applications 2008 and Hyper-V clustering; some Virtualization in critical enterprise envi- solutions may be Windows Server 2008 ronments has often been hampered by compliant but not support Hyper-V clus- complex and confusing support policies. Quick link tering. Check with the storage vendor to For example, many vendors provide “best learn whether updates to existing firm- effort” virtualization support that requires ware and drivers are necessary. administrators to reproduce the problem Dell and Microsoft Hyper-V: ■■ Use the Node and Disk Majority option on physical hardware before they will DELL.COM/Hyper-V for the cluster witness (called the offer support. 1 For more information on best practices, see “Hyper-V Planning and Deployment Guide,” by Microsoft Corporation, August 2008, www.microsoft.com/downloads/details.aspx?FamilyID=5DA4058E-72CC-4B8D-BBB1-5E16A136EF42; and “Step-by-Step Guide for Testing Hyper-V and Failover Clustering,” by Microsoft Corporation, May 2008, www.microsoft.com/downloads/details.aspx?FamilyID=CD828712-8D1E-45D1-A290-7EDADF1E4E9C. 2 For more information on Microsoft support policies for virtualized environments, visit support.microsoft.com/?kbid=957006. For more information on the Server Virtualization Validation Program, visit www.windowsservercatalog.com/svvp. Reprinted from Dell Power Solutions, November 2008. Copyright © 2008 Dell Inc. All rights reserved. DELL.COM/PowerSolutions 25