System information

Using VMotion to Migrate Virtual Machines
VMotion allows administrators to manually migrate virtual machines to different hosts. Administrators can
migrate a running virtual machine to a different physical server connected to the same SAN without service
interruption.
VMotion makes it possible to do the following tasks:
n
Perform zero-downtime maintenance by moving virtual machines around so that the underlying
hardware and storage can be serviced without disrupting user sessions.
n
Continuously balance workloads across the datacenter to most effectively use resources in response to
changing business demands.
Using VMware DRS to Migrate Virtual Machines
VMware DRS helps improve resource allocation across all hosts and resource pools.
DRS collects resource usage information for all hosts and virtual machines in a VMware cluster and gives
recommendations (or migrates virtual machines) in one of two situations:
Initial placement
When you first power on a virtual machine in the cluster, DRS either places the
virtual machine or makes a recommendation.
Load balancing
DRS tries to improve resource use across the cluster by performing automatic
migrations of virtual machines (VMotion) or by providing recommendations
for virtual machine migrations.
Fibre Channel SAN Configuration Guide
28 VMware, Inc.