Qlogic Fibre Channel HBA and VM Spécifications télécharger pdf (Page 31)

FC0054605-00 A 8-1

8 Migrating Virtual Machines

and Virtual Ports

Microsoft System Center VMM2008 allows you to quickly migrate Virtual

Machines from one host to another. Migration allows administrators to perform

maintenance on physical servers and easily move Virtual Machines to other

servers with minimal downtime.

VMM2008 allows for two types of migrations:

 LAN Transfer/Migration of Virtual Machines. In LAN transfers, all the files

(VHDs) related to the Virtual Machine are moved from the source machine

to the destination machine via the LAN. While very flexible, LAN transfers

are slower compared to SAN transfers due to the time it takes to physically

move the files over the LAN. The time taken for a LAN transfer can vary

greatly depending on the size of the Virtual Machine’s VHD.

 SAN Transfer/Migration of Virtual Machines. In SAN transfers, the LUN

containing the Virtual Machine is remapped from the source server to the

destination server (instead of transferring the files over the network).

Therefore, SAN transfers are much faster than standard network transfers,

and are independent of the size of the files being transferred.

This section defines the requirements for SAN transfers, describes how to start a

SAN transfer, and discusses how NPIV plays a role in SAN transfers.

Requirements for a SAN Transfer

The requirements for a SAN transfer are:

 Both the source and destination hosts involved in a transfer of a Virtual

Machine need to have physical access to the storage array presenting the

LUNs.

 Both the source and destination hosts must have NPIV-capable adapters

connected to an NPIV-capable switch.

 The Virtual Machine and all its associated files (VHDs) must reside on the

SAN as seen through an NPIV virtual adapter port (not on a local disk).

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Qlogic Fibre Channel HBA and VM Spécifications Page 31