Time Synchronization User's Guide

HP NonStop Time Synchronization User’s Guide Page 39 of 81
the configuration file, otherwise TimeSync will not be able to synchronize the local system
time.
Value Range: {<IP address> | <host name>}[:<remote port number>], where <IP address>
is a legal dotted-decimal IP address, <host name> is a legal TCP/IP host name, and
<remote port number> is a valid TCP/IP port number. If <remote port number> is not
given, the default NTP/SNTP port number of 123 is used.
Default Value: None (TimeSource definitions must be added to the configuration file)
Example: TimeSource = 192.168.1.200:5000
TimeSource = time.windows.com
UpdateInterval <value>
The frequency, in seconds, at which time synchronization requests are sent to the remote
time source and the local time updated. Note that the actual interval between the
initiation of sync operations will be slightly larger than this value because TimeSync does
not schedule the subsequent update until the current sync initiation is completed. In most
cases, this means the interval between sync attempts will be the UpdateInterval value plus
the MaxReplyWindow value.If one or more synchronization times are specified in the
SyncAt list described above, TimeSync does not utilize the UpdateInterval value. Instead,
sync operations are only initiated at the scheduled SyncAt times.
Important!!! On NonStop systems, HP recommends that you set the UpdateInterval to no
less than 360 seconds (6 minutes) for normal usage. Setting the UpdateInterval to a value
less than this for a long period of time can lead to timekeeping anomalies on the system. In
addition, please note that on NonStop systems the minimum UpdateInterval is 13 seconds.
If you supply an UpdateInterval less than this, TimeSync will still only process updates every
13 seconds. This is necessary because of other auditing and synchronization tasks that
TimeSync performs between updates.
Value Range: 1 through 4294967295
Default Value: 3600 (1 hour)
Example: UpdateInterval = 2000
4.3.4 Logging Options
Logging configuration options are contained in the Logging section of the configuration