Archive

Archive for May, 2011

Hyper-V : Best Practices and Supported scenarios regarding Exchange Server 2010

 The following are the supported scenarios for Exchange 2010 SP1 :

  • The Unified Messaging server role is supported in a virtualized environment.
  • Combined Exchange 2010 high availability solutions (database availability groups (DAGs)) with hypervisor-based clustering, high availability, or migration solutions that will move or automatically failover mailbox servers that are members of a DAG between clustered root servers

HyperV Guest Configuration

Keep in mind that because there are no routines within Exchange Server that test for a virtualized platform, Exchange Server behaves no differently programmatically on a virtualized platform than it does on a physical platform.

Determining Exchange Server Role Virtual Machine Locations

When determining Exchange Server Role virtual machine locations, consider the following general best practices:

  • Deploy the same Exchange roles across multiple physical server roots (to allow for load balancing and high availability).
  • Never deploy Mailbox servers that are members of the same Database Availability Groups (DAGs) on the same root.
  • Never deploy all the Client Access Servers on the same root.
  • Never deploy all the Hub Transport servers on the same root.
  • Determine the workload requirements for each server and balance the workload across the HyperV guest virtual machines.

Guest Storage

Each Exchange guest virtual machine must be allocated sufficient storage space on the root virtual machine for the fixed disk that contains the guest’s operating system, any temporary memory storage files in use, and related virtual machine files that are hosted on the root machine.Consider the following best practices when configuring Hyper-V guests:

  • Fixed VHDs are recommended for the virtual operating system.
  • Allow for a minimum of a 15-GB disk for the operating system, allow additional space for the paging file, management software, and crash recovery (dump) files. Then add Exchange server role space requirements.
  • Storage used by Exchange should be hosted in disk spindles that are separate from the storage that hosts the guest virtual machine’s operating system.
  • For Hub Transport servers, correctly provision the necessary disk space needed for the message queue database, and logging operations.
  • For Mailbox servers, correctly provision the necessary disk space for databases, transaction logs, the content index, and other logging operations. .

Guest Memory : Dynamic Memory should be disabled
Memory must be sized for guest virtual machines using the same methods as physical computer deployments. Exchange—like many server applications that have optimizations for performance that involve caching of data in memory—is susceptible to poor system performance and an unacceptable client experience if it doesn’t have full control over the memory allocated to the physical computer or virtual machine on which it is running.
Many of the performance gains in recent versions of Exchange, especially those related to reduction in input/output (I/O) are based on highly efficient usage of large amounts of memory. When that memory is no longer available, the expected performance of the system can’t be achieved. For this reason, memory oversubscription or dynamic adjustment of virtual machine memory must be disabled for production Exchange servers.

Deployment Recommendations

When designing an Exchange Server 2010 virtualized environment, the core Exchange design principles apply. The environment must be designed for the correct performance, reliability, and capacity requirements. Design considerations such as examining usage profiles, message profiles, and so on must still be taken into account.

See this article (Mailbox Storage Design Process) as a starting point when considering a high availability solution that uses DAGs.

Because virtualization provides the flexibility to make changes to the design of the environment later, some organizations might be tempted to spend less time on their design at the outset. As a best practice, spend adequate time designing the environment to avoid pitfalls later.

Group the Exchange Server roles in such a way that balances workloads on the root servers. Mixing both roles on the same HyperV root server can balance the workloads and prevent one physical resource from being unduly stressed, rather than if the same roles were put on the same hosts

The updated support guidance applies to any hardware virtualization vendor participating in the Windows Server Virtualization Validation Program (SVVP).

Best Practices for Virtualizing Exchange Server 2010 with Windows Server 2008 R2 Hyper-Vwhitepaper. This whitepaper is designed to provide technical guidance on Exchange server roles, capacity planning, sizing and performance, as well as high availability best practices.

Complete system requirements for Exchange Server 2010 running under hardware virtualization software can be found in Exchange 2010 System Requirements. Also, the support policy for Microsoft software running in non-Microsoft hardware virtualization software can be found here.

CentOS now have official support as guest VM in Hyper-V

Effective immediately, Microsoft will support Windows Server2008 R2 Hyper-V to run CentOS.  

CentOS is a popular Linux distribution for Hosters, and this was the number one requirement for interoperability that we heard from that community.

This development will enable MS Hosting partners to consolidate their mixed Windows + Linux infrastructure on Windows Server Hyper-V; reducing cost and complexity, while betting on an enterprise class virtualization platform. .

How will support work?
Call Microsoft CSS. Support will cover installation issues as well as configuration issues.

What version of the Linux Integration Services support CentOS?

 The existing Hyper-V Linux Integration Services for Linux Version 2.1 support CentOS. The following features are included in the Hyper-V Linux Integration Services 2.1 release:

· Symmetric Multi-Processing (SMP) Support: Supported Linux distributions can use up to 4 virtual processors (VP) per virtual machine.

· Driver support for synthetic devices: Linux Integration Services supports the synthetic network controller and the synthetic storage controller that were developed specifically for Hyper-V.

· Fastpath Boot Support for Hyper-V: Boot devices take advantage of the block Virtualization Service Client (VSC) to provide enhanced performance.

· Timesync: The clock inside the virtual machine will remain synchronized with the clock on the host.

· Integrated Shutdown: Virtual machines running Linux can be gracefully shut down from either Hyper-V Manager or System Center Virtual Machine Manager.

· Heartbeat: Allows the host to detect whether the guest is running and responsive.

· Pluggable Time Source: A pluggable clock source module is included to provide a more accurate time source to the guest.

The Linux Integration Services are available via the Microsoft Download Center here: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=eee39325-898b-4522-9b4c-f4b5b9b64551

 From Wikipedia:

CentOS is a community-supported, mainly free software operating system based on Red Hat Enterprise Linux (RHEL). It exists to provide a free enterprise class computing platform and strives to maintain 100% binary compatibility with its upstream distribution. CentOS stands for Community ENTerprise Operating System.

Red Hat Enterprise Linux is available only through a paid subscription service that provides access to software updates and varying levels of technical support. The product is largely composed of software packages distributed under either an open source or a free software license and the source code for these packages is made public by Red Hat.

CentOS developers use Red Hat’s source code to create a final product very similar to Red Hat Enterprise Linux. Red Hat’s branding and logos are changed because Red Hat does not allow them to be redistributed.

CentOS is available free of charge. Technical support is primarily provided by the community via official mailing lists, web forums, and chat rooms. The project is not affiliated with Red Hat and thus receives no financial or logistical support from the company; instead, the CentOS Project relies on donations from users and organizational sponsors.

Hyper-V : Supported Server Guest Operating Systems. Updated May 2011

 

 The following tables list the Server guest operating systems that are supported for use on a virtual machine as a guest operating system.

Server guest operating system Editions Virtual processors
Windows Server 2008 R2 with Service Pack 1 Standard, Enterprise, Datacenter, and Web editions 1, 2, or 4
Windows Server 2008 R2 Standard, Enterprise, Datacenter, and Windows Web Server 2008 R2 1, 2, or 4
Windows Server 2008 Standard, Standard without Hyper-V, Enterprise, Enterprise without Hyper-V, Datacenter, Datacenter without Hyper-V, Windows Web Server 2008, and HPC Edition 1, 2, or 4
Windows Server 2003 R2 with Service Pack 2 Standard, Enterprise, Datacenter, and Web 1 or 2
Windows Home Server 2011 Standard 1
Windows Storage Server 2008 R2 Essentials 1
Windows Small Business Server 2011 Essentials 1 or 2
Windows Small Business Server 2011 Standard 1, 2, or 4
Windows Server 2003 R2 x64 Edition with Service Pack 2 Standard, Enterprise, and Datacenter 1 or 2
Windows Server 2003 with Service Pack 2 Standard, Enterprise, Datacenter, and Web 1 or 2
Windows Server 2003 x64 Edition with Service Pack 2 Standard, Enterprise, and Datacenter 1 or 2
CentOS 5.2 through 5.6 (NEW)  x86 edition and x64 edition 1, 2, or 4
Red Hat Enterprise Linux 5.6 x86 edition and x64 edition 1, 2, or 4
Red Hat Enterprise Linux 5.5 x86 edition and x64 edition 1, 2, or 4
Red Hat Enterprise Linux 5.4 x86 edition and x64 edition 1, 2, or 4
Red Hat Enterprise Linux 5.3 x86 edition and x64 edition 1, 2, or 4
Red Hat Enterprise Linux 5.2 x86 edition and x64 edition 1, 2, or 4
SUSE Linux Enterprise Server 11 with Service Pack 1 x86 edition and x64 edition 1, 2, or 4
SUSE Linux Enterprise Server 10 with Service Pack 4 x86 edition and x64 edition 1, 2, or 4

 Note: Support for Windows 2000 Server and Windows XP with Service Pack 2 (x86) ended on July 13, 2010

Source : http://technet.microsoft.com/en-us/library/cc794868(WS.10).aspx