Dell UPS 4200R - Manual (Page 115)

Applying Extended Functionality 116
Configuring Maintenance Mode and Live Migration with SCVMM
Maintenance Mode
In Virtual Machine Manager (VMM) 2008 R2, you can start maintenance mode for a virtual machine
host anytime that you need to perform maintenance tasks on the physical host, such as applying security
updates or replacing hardware on the physical host computer.
When you start maintenance mode on a Windows-based host, VMM automatically does the following:
• On a stand-alone host, places all running virtual machines into a saved state.
• On a Windows-based host cluster that is capable of live migration, gives you the option to do one of
the following:
–
Live migrate all running highly available virtual machines to other hosts in the cluster, and place
any running virtual machines that are not highly available in a saved state.
– Place all running virtual machines into a saved state.
NOTE: Refer to Microsoft ® Hyper-V ™ reference on page 117.
Understanding Live Migration
Live migration is a Hyper-V feature in Windows Server 2008 R2, which requires the failover clustering
feature to be added and configured on the servers running Hyper-V. Live migration allows you to
transparently move running virtual machines from one node of the failover cluster to another node in the
same cluster without a dropped network connection or perceived downtime.
In addition, failover clustering requires shared storage for the cluster nodes. This can include an iSCSI or
Fiber-Channel Storage Area Network (SAN). All virtual machines are stored in the shared storage area,
and the running virtual machine state is managed by one of the nodes.
NOTE:
Refer to the Hyper-V reference links on page 117.
Configuration Test
To test the installation, please perform a power failure on the UPS and check on Microsoft System
Center Virtual Machine Manager (SCVMM) console that the corresponding Hyper-V host enters in
Maintenance mode after the “Maintenance mode timer.”
Hyper-V machines have to be started before the machine that is hosting the SCVMM. The SCVMM
service needs some time to refresh its status. If the starting sequence is not correct, the Hyper-V will stay
in Maintenance mode
0119_2-Dell MUMC UG.book Page 116 Saturday, November 2, 2013 4:59 PM