6.0.2

Table Of Contents
3 Click Properties, and click Options.
4 Select NTP .
5 Click Add.
6 In the Add NTP Server dialog box, enter the IP address or fully qualied domain name of the NTP
server to synchronize with.
7 Click OK.
The host time synchronizes with the NTP server.
Downtime During the vCenter Server Upgrade
When you upgrade vCenter Server, downtime is required for vCenter Server.
Expect downtime for vCenter Server as follows:
n
The upgrade requires vCenter Server to be out of production for a minimum of 40 to 50 minutes, and
can take much longer depending on the size of the database. The database schema upgrade takes
approximately 10 to 15 minutes of this time. This estimate does not include host reconnection time after
the upgrade.
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For vCenter Server deployments with an embedded database, the upgrade can require extra time to
migrate the data from the legacy vCenter Server database to the new database instance.
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If Microsoft .NET Framework is not installed on the machine, a restart is required before starting the
vCenter Server installation.
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vSphere Distributed Resource Scheduler (DRS) does not work while the upgrade is in progress.
vSphere HA does work during the upgrade.
Downtime is not required for the ESXi hosts that vCenter Server is managing, or for virtual machines that
are running on the hosts.
Using a User Account for Running vCenter Server
You can use the Microsoft Windows built-in system account or a user account to run vCenter Server. With a
user account, you can enable Windows authentication for SQL Server, and it provides more security.
The user account must be an administrator on the local machine. In the installation wizard, you specify the
account name as DomainName\Username. You must congure the SQL Server database to allow the domain
account access to SQL Server.
The Microsoft Windows built-in system account has more permissions and rights on the server than the
vCenter Server system needs, which can contribute to security problems.
I If the vCenter Server service is running under the Microsoft Windows built-in system account,
when using Microsoft SQL Server, vCenter Server 6.0 supports only DSNs with SQL Server authentication.
For SQL Server DSNs congured with Windows authentication, use the same user account for the VMware
VirtualCenter Management Webservices service and the DSN user.
If you do not plan to use Microsoft Windows authentication for SQL Server or you are using an Oracle
database, you might still want to set up a local user account for the vCenter Server system. The only
requirement is that the user account is an administrator on the local machine and the account must be
granted the Log on as a service privilege.
vSphere Upgrade
68 VMware, Inc.