Best Practices and Guidelines for Hyper-V with Exchange Server 2007 SP1

Today we will talk about the new Hyper-V technology support for the Messaging virtualization from Microsoft, Microsoft released its hardware virtualization software a while ago and eventually the Exchange Server 2007 SP1 is supported in the production environment, in able to make it supported, certain aspects and conditions must be met otherwise you will put yourself in unsupported situation, in this document we will refer to the Windows Server 2008 that will hold the Hyper-V component and will host the virtual servers as the Root, the Virtual Machine that will be running on the Hyper-V are called the Guest, so let's start..

First let's list some of the supported software to fully function in the production over a virtualized environment, below are the list with the latest updates on 26^th August 2008:

• Microsoft Application Virtualization (App-V)
  
• Microsoft BizTalk Server
  
• Microsoft Commerce Server
  
• Microsoft Dynamics AX
  
• Microsoft Dynamics CRM
  
• Microsoft Dynamics NAV
  
• Microsoft Exchange Server (Except UM role)
  
• 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 Internet Security and Acceleration (ISA) Server
  
• Microsoft Office Groove Server
  
• Microsoft Office PerformancePoint Server
  
• Microsoft Office Project Server
  
• Microsoft Office SharePoint Server and Windows SharePoint Services
  
• Microsoft Operations Manager (MOM) 2005
  
• Microsoft Search Server
  
• Microsoft SQL Server 2008
  
• 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 Windows HPC Server 2008
  
• Windows Server 2003 Web Edition
  
• Microsoft Windows Server Update Services (WSUS)
  
• Windows Web Server 2008
  

Conditions to support Exchange Server 2007:

1. In Microsoft virtualization environment, it must be Windows Server 2008 Hyper-V x64 (Not Virtual Server NOT virtual PC)
   
2. The Virtualization software other than Microsoft Hyper-V must pass the Server Virtualization Validation Program SVVP (at this moment only Hyper-V passed this test)
   
3. Exchange Server 2007 must be with SP1 or later
   
4. Exchange Server 2007 with SP1 must be installed on a guest operating system running Windows Server 2008 x64
   
5. Support high availability and Exchange clustering Local Continuous Replication, Cluster Continuous Replication, Single Copy Cluster and Standby Continuous Replication. However when using Quick Migration with Hyper-V the CCR and SCC will not be supported.
   
6. Exchange Server 2007 installed without the Unified Messaging Server role, the UM server role is not yet supported
   
7. If you will use virtual hard disks, Only Fixed Size Disks are supported. Differencing, dynamically expanded or any virtual storage are not supported, ONLY FIXED SIZE HARD DISK is supported as virtual disk type
   
8. The Root Server (the one that run the Hyper-V components) must be dedicated server for that purpose, it's not supported to install any other software on the Root server, it should function only as Hyper-V Server
   
9. Hyper-V include a feature called snapshots that you can revert the system back to this captured state, but it's not supported with Exchange Server 2007 Virtual Guest as the Snapshot is not Exchange-Aware
   
10. The virtual processor-to-logical processor mapping must not exceed 2:1 otherwise it's not supported, that's mean if you have server with two processors with dual core, that's make total of 4 logical processors, the maximum supported is 2:1 which is 8 CPUs in this case, note that these 8 CPUs is the maximum allowed per ALL guests on the same root
    
11. hardware-based VSS solutions is not supported to back up virtualized Exchange Server
    

Guidelines, Recommendations and best practices:

1. Use pass-through SCSI storage disks or internet iSCSI storage for better performance
   
2. Before creating virtual disk, it's recommended to start disk defragment on the root server to reduce disk fragments
   
3. Install the integration services on the guest operating system
   
4. Ensure that an enforced Data Execution Prevention (DEP) must be available and enabled on the hardware level
   
5. Put in mind that if you will use Server 2008 datacenter Edition, you physical memory can support up to 1 TERABYTE of memory, with enterprise edition you limited to 64 GB, and for standard only 32 GB of memory
   
6. Put on mind that Hyper-V is supported on physical computers with up to 16 logical processors.
   
7. Also put in the same mind that you can use TPM chip with Bit Locker ® security feature of Windows Server 2008 to secure your virtual hard disks
   
8. The virtual fixed size hard disk is limited in size to 2040 Gigabyte of disk space, while the pass-through physical disks are not limited to a space
   
9. You can take up to 50 snapshots of per guest, it's supported only to make your backup solution for a recovery of Exchange disasters
   
10. When allocating the number of virtual processors don't forget the root server share of the
    
11. Use Windows System Resource Manager WSRM to control the resources utilization
    
12. When calculating the total number of virtual processors required by the root machine, you must also account for both I/O and operating system requirements. In most cases, the equivalent number of virtual processors required in the root operating system for a system hosting Exchange virtual machines is 2. This value should be used as a baseline for the root operating system virtual processor when calculating the overall ratio of physical cores to virtual processors. If performance monitoring of the root operating system indicates you are consuming more processor utilization than the equivalent of 2 processors, you should reduce the count of virtual processors assigned to guest virtual machines accordingly and verify that the overall virtual processor-to-physical core ratio is no greater than 2:1.
    
13. The Exchange server guest machine's storage and network design requires additional considerations for the root machine, specifically, the impact to the CPUs on the root machine. In some hardware virtualization environments (such as Hyper-V), all I/O requests that are made by guest virtual machines are serviced through the root machine. In these environments, we recommend that no other I/O intensive applications (for example, Microsoft SQL Server) be deployed on guest machines that are hosted on the same root machine as Exchange server guest machines.
    
14. Use multiple network adapters for network-intensive VM workloads, and management
    
15. Ensure your storage hardware has I/O bandwidth and capacity to meet current and future needs of the VMs.
    
16. Consider Placing VMs with highly disk-intensive workloads on different physical disks will likely improve overall performance
    
17. If using clustering, make one Exchange cluster node on one Root, and the other node on another Root to truly achieve high availability