Appendix 3: Configuring Maintenance Mode And Livemigration With Scvmm; Maintenance Mode; What Is Live Migration; Configuration Test - Dell PowerEdge UPS 500T User Manual

14. APPENDIX 3: CONFIGURING MAINTENANCE MODE AND LIVEMIGRATION WITH
SCVMM
14.1.

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:
x
On a stand alone host, places all running virtual machines into a saved state.
x
On a Windows based host cluster that is capable of live migration, gives you the option to do
one of the following:
o 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.
o Place all running virtual machines into a saved state.
(Please refer to Microsoft user documentation listed in
14.2.

WHAT IS 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. (Please refer to Microsoft user
documentation listed in
14.3.

CONFIGURATION TEST

To test the installation, please perform a power failure on the UPS and check on 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.
SCVMM service needs some time to refresh its status. If the starting sequence is not correct, the
Hyper V will stay in Maintenance mode
Dell MUMC – User Guide
P 164000119 Rev 0.03
Appendix 5 VMware references)
Dell Multi UPS Management Console
Appendix 5 VMware
USER GUIDE
Dell.com
references)
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