4.10 Changing the NTP Servers

The configuration settings for the Network Time Protocol (NTP) servers can be changed after initial setup.

All servers and switches in Oracle Exadata should reference the same NTP servers so that the components are synchronized to the same time.

The following topics contain the tasks and procedures for setting the Oracle Exadata servers and switches to the same NTP server addresses. When required, Oracle recommends changing the servers one at a time.

Note:

• These procedures assume that there is not a large time difference between NTP servers. Use the command ntpq -p to see if the system is healthy first before performing the NTP server update.

• An Oracle Exadata deployment can specify up to three NTP servers. Oracle Exadata database servers and storage servers can use all configured NTP servers. Where applicable, additional limits are specified in the following component-specific topics.

• Set the NTP Server Address on the Database Servers
  You can set or change the Network Time Protocol (NTP) server address on the database server of Oracle Exadata.
• Change the NTP Server on Oracle Exadata Storage Server
  You can set or change the Network Time Protocol (NTP) server on each Oracle Exadata Storage Server.
• Set the NTP Server Address on the Cisco RoCE Network Fabric Switches
  This procedure describes how to change the Network Time Protocol (NTP) server address on the Cisco RoCE Network Fabric switches.
• Set the NTP Server Address on an InfiniBand Network Fabric Switch
  You can set or change the Network Time Protocol (NTP) server settings on an InfiniBand Network Fabric switch.
• Set the NTP Server Address on the Cisco 9300 Series Management Network Switch
  This procedure describes how to change the Network Time Protocol (NTP) server address on the Cisco 9300 Series Management Network Switch.
• Set the NTP Server Address on the Cisco 4948 Ethernet Switch
  You can set or change the Network Time Protocol (NTP) server on the Cisco 4948 Ethernet switch.