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One or more NICs dedicated to the guest virtual machines (use 10 gpbs

NICS for highest consolidation)

Two or more NICs dedicated to iSCSI with MPIO

Dedicate at least one NIC/Port on each host server for guest virtual machine network I/O. For maximum consolidation ratio, utilize one or more 10-Gigabit Ethernet NICs to virtual machine network I/O.

Host Bus Adapter Architecture The disk storage for all guest virtual machines is one or more VHD files housed

on the storage system being utilized by the host server. Host storage I/O, in addition to the system, processor, memory, and network architectures described earlier, is the final major component of host server sizing. Hyper-V I/O consists of a large number of read and write IOPS to the storage system due to the large number of guests running on each server and their various workloads.

If direct attached storage is being utilized, a SATA II or SAS RAID controller internal to the server is recommended as described earlier. If a storage array and SAN are being utilized, host bus adapters (HBAs) are required in the host server. The HBA provides access to the storage array from the host server. The storage connectivity is a critical component for high availability and performance.

Recommendation Utilize at least one Fibre Channel HBA or one dedicated NIC for iSCSI with the Single Host Server architecture pattern.

If using Fibre Channel, utilize 4 GFC or 8 GFC HBAs.

If using iSCSI, utilize MPIO in a load-balancing configuration for maximum throughput.

Operating System Architecture

Operating System Version The choice of operating system for the Hyper-V hosts is important from a

support and performance perspective, as well as an overall cost perspective. As mentioned earlier, an x64 version of Windows Server is required in all scenarios.

Also, consider virtualization use rights when choosing the operating system version. Certain versions of Windows Server 2008 R2 (namely Standard, Enterprise, and Datacenter editions) include ―virtualization use rights,‖ which is the right and license to run a specified number of Windows-based virtual machines. Windows Server® 2008 R2 Standard edition includes use rights for

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