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Slave Timings  Slave Timings
Domain Time II Server
Version 5.2

Settings on this page control how often Slaves synchronize their time with the Master.

Note: This property page will only appear on the Master Server. Slaves will always use these settings. See Domain Role for more information on the Master, Slave, and Independent Server roles.


 Check Interval when able to get and correct the time 

Variable - check as often as needed to maintain approximately milliseconds sync with server
 Fixed - check once every  

Variable - check as often as needed to maintain approximately milliseconds sync with server

When this option is selected, Domain Time will automatically adjust how often it synchronizes with time sources to attempt to keep the clock within the threshold limit you set.

    The wait period between time checks is called the window size. You can see the window size Domain Time is currently using by examining the Text Log. Domain Time will adjust the window size based on how accurate previous time checks have been. If previous time corrections have been small the window size will be increased, and vice versa. The range of adjustment for the window size is between 15 seconds to 2 hours. On most machines, it will average between 10 - 30 minutes.

    The Variable scheduling method is intended for use on machines with relatively constant clock drift and moderate accuracy requirements (where the acceptable tolerance for clock drift is more than ~25ms). This method strikes a good balance between maintaining the target accuracy while minimizing network traffic.

    Variable is not a good selection if the machine is under heavy and/or variable load that causes the clock to drift by significant amounts on an irregular basis. Since Domain Time may select a large window size if the clock on the machine has been well-behaved, anything that causes sudden clock drift during the Window period between checks can cause the clock to drift outside the specified threshold before the next correction. If this describes your machine, you should use the Fixed schedule instead.

    Since having highly-accurate time at all times is usually more critical on Servers, you will probably want to choose a fixed schedule on your Servers.

 Fixed - check once every  

If this option is selected, Domain Time will synchronize regularly on the schedule you specify.

    This method is a good choice when you want to discipline the clock to stay within very tight synchronization tolerances. It's also the best choice for machines with highly variable load, poor timekeeping hardware, or any other issue that causes significant clock drift.

    You should check the time often enough to keep your Slaves within your desired accuracy.


 Check Interval when getting the time fails 

If Domain Time cannot
obtain the time, it should   
try again every:

If Domain Time cannot obtain the time, it should try again every:  
sets how often Domain Time will retry its time sources if it is unable to successfully obtain the time. You will probably want to check more often than during normal operation (unless you're already using a frequent synchronization schedule) to reacquire the correct time quickly when your time source(s) become available.

The same caution about synchronizing too often against your time sources (discussed above) applies.


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