分类: 虚拟化
2011-09-21 13:14:17
Windows Version | Recommended Time Sync Utility |
Windows 2008 | w32time or NTP |
Windows Vista | w32time or NTP |
Windows 2003 | w32time or NTP |
Windows XP | NTP |
Windows 2000 | NTP |
When using w32time, there are a number of configuration parameters that can be changed. The table below describes the relevant parameters and gives a recommended value. All of the parameters are stored in the registry. Some of them can also be modified via the w32tm utility instead of directly editing the registry. This best practices guide covers running w32time in NTP mode. w32time can also use the windows domain hierarchy as time servers, which is not covered in this best practices guide.
Key | Details |
HKEY_LOCAL_MACHINE\
SYSTEM\CurrentControlSet\
Services\W32Time\
TimeProviders\NtpClient\
SpecialPollInterval |
Recommended Value: 900
Type: REG_DWORD
Description:
This parameter controls how often w32time will poll the time server to
check whether time on the client needs to be corrected. The parameter is
specified as number of seconds to wait between polling. The recommended
value of 900 specifies that the time server should be polled once every
15 minutes. |
HKEY_LOCAL_MACHINE\
SYSTEM\CurrentControlSet\
Services\W32Time\Parameters\
NtpServer |
Recommended Value:
1.pool.ntp.org,0x1
2.pool.ntp.org,0x1
3.pool.ntp.org,0x1
Type: REG_SZ
Description: This parameter specifies the time servers to use. It is specified as a string of space separated servers. Specifying ",0x1" after the server name indicates that the server should be contacted at the frequency specified by the SpecialPollInterval setting. Note: Modify the recommended value to point to the ntp servers available in your environment. w32tm Command:
w32tm /config"/manualpeerlist:
1.pool.ntp.org,0x1
2.pool.ntp.org,0x1
3.pool.ntp.org,0x1" Note: Modify the command to use the ntp servers available in your environment. |
HKEY_LOCAL_MACHINE\
SYSTEM\CurrentControlSet\
Services\W32Time\Parameters\
Type |
Recommended Value: NTP
Type: REG_SZ
Description:
This parameter specifies the mode that w32time should use. A value of
NT5DS indicates that w32time should use the Windows domain hierarchy as
its time servers rather than the NTP servers specified in the NtpServer
key.
w32tm Command:
w32tm /config /syncfromflags:
MANUAL |
When using w32time or NTP in the guest, disable VMware Tools periodic time synchronization.
To disable VMware Tools periodic time sync, use one of these options:
These options do not disable one-time synchronizations done by VMware Tools for events such as tools startup, taking a snapshot, resuming from a snapshot, resuming from suspend, or VMotion. These events synchronize time in the guest operating system with time in the host operating system even if VMware Tools periodic time sync is disabled, so it is important to make sure that the host operating system's time is correct. For more information, see .
Product |
Action |
ESX 3.5 and later |
No action required |
ESX 3.0.3 |
Ensure patch is applied |
ESX 3.0.2 |
Ensure patch is applied |
ESX 3.0.1 |
Ensure patch is applied |
ESX 3.0.0 |
Ensure patch is applied |
ESX 2.5.x and earlier |
Upgrade to ESX 3.0.0 or later |
Fusion 2.0 and later |
No action required |
Fusion 1.x |
Upgrade to Fusion 2.0 or later |
Player 2.0 and later |
No action required |
Player 1.x |
Upgrade to Player 2.0 or later |
Workstation 6.0 and later |
No action required |
Workstation 5.x |
Upgrade to Workstation 6.0 or later |