Overview Of Time Synchronization - Novell OPEN ENTERPRISE SERVER - PLANNING AND IMPLEMENTATION GUIDE 12-2010 Implementation Manual


Section 12.3.5, "Configuring and Administering Time Synchronization," on page 109

Section 12.3.6, "Daylight Saving Time," on page 110

12.3.1 Overview of Time Synchronization

All servers in an eDirectory tree must have their times synchronized to ensure that updates and
changes to eDirectory objects occur in the proper order.
eDirectory gets its time from the server operating system of the OES 2 server where it is installed. It
is, therefore, critical that every server in the tree has the same time.

"Understanding Time Synchronization Modules" on page 100

"OES 2 Servers as Time Providers" on page 102

"OES 2 Servers as Time Consumers" on page 103
Understanding Time Synchronization Modules
During the upgrade to OES 2, your eDirectory tree might contain servers running OES 2, NetWare
6.5 SP8, or previous versions of NetWare. Therefore, you must understand the differences in the
time synchronization modules that each operating system uses and how these modules can interact
with each other.

"OES 2 vs. NetWare 6.5" on page 100

"OES 2 Servers Use the Network Time Protocol (NTP) to Communicate" on page 100

"Compatibility with Earlier Versions of NetWare" on page 101
OES 2 vs. NetWare 6.5
As illustrated in
Timesync modules for time synchronization. Both modules can communicate with OES 2 by using
NTP. However, when installing virtualized NetWare, Timesync should always be used (see
Section 6.18.2, "Always Use Timesync Rather Than NTP," on page
OES 2 must use the NTP daemon (xntpd).
Figure 12-1
xntpd daemon
OES 2 Servers Use the Network Time Protocol (NTP) to Communicate
Because OES 2 and NetWare servers must communicate with each other for time synchronization,
and because Linux uses only NTP for time synchronization, it follows that both Linux and NetWare
must communicate time synchronization information by using NTP time packets.
However, this doesn't limit your options on NetWare.
100 OES 2 SP3: Planning and Implementation Guide
Figure 12-1, NetWare 6.5 can use either the Network Time Protocol (NTP) or
Time Synchronization for Linux and NetWare
only
XNTPD NLM
OES Linux NetWare 6.5
or
TIMESYNC NLM
69).