How to make Network Time Protocol (NTP) changes on Compute and Cell nodes without node reboot

Asset ID:	1-71-1963463.1
Update Date:	2015-12-23
Keywords:

Solution Type Technical Instruction Sure

Solution 1963463.1 : How to make Network Time Protocol (NTP) changes on Compute and Cell nodes without node reboot

Applies to:

Exadata X4-2 Full Rack - Version All Versions to All Versions [Release All Releases]
Exadata X3-2 Half Rack - Version All Versions to All Versions [Release All Releases]
Oracle Solaris on x86-64 (64-bit)
Linux x86-64

Goal

Make Network Time Protocol (NTP) changes on Compute and Cell nodes without node reboot

Solution

Compute Node

For the compute node, the configuration file can be changed and the service restarted.

Do this one compute node at a time as it can cause a CRS node eviction and forced reboot.

The following procedure describes how to set the NTP server address on the database server:

a: Stop the NTP services on the database server using one of the following commands:

For the Oracle Linux operating system:

# service ntpd stop

For the Oracle Solaris operating system:

# svcadm stop svd:/network/ntp:default

b: Update the following file with the IP address of the new NTP server.

For the Oracle Linux operating system

/etc/ntp.conf
For the Oracle Solaris operating system

/etc/inet/ntp.conf

c: Start the NTP services on the database server using one of the following commands:

For the Oracle Linux operating system:

# service ntpd start

For the Oracle Solaris operating system:

# svccfg -s svc:/network/ntp:default steprop config/slew_always=true
# svcadm start svc:/network/ntp:default

Repeat steps a through c for each database server.

Storage Cell
For the storage cell node (Linux only)

a: Follow steps 1 through 5 of My Oracle Support note 1188080.1. (failure to do so can cause a database failure)

b: Shut down the cell services and ocrvottargetd service using the following commands:

# cellcli -e alter cell shutdown services all

# service ocrvottargetd stop

c: Use the ipconf utility to change the NTP settings using the following command:

# /usr/local/bin/ipconf

d: Re-start Cell Services:

# service ocrvottargetd start

# service celld start

e: Follow steps 7 through 10 in note 1188080.1, in order to bring the grid disks online before moving to another cell.

Repeat steps a through e for each storage cell node.

You may receive the following warning when running the steps in this note:
------------------------------------------------------------------------
[Warning]: You modified NTP server.
Ensure you also update the Infiniband Switch NTP server
if the same NTP server was also used by the Infiniband switch.
------------------------------------------------------------------------

According to Exadata Owners Guide all the NTP info should be the same across all nodes in a rack.

Below is a link to info on setting NTP info on all Exadata Devices

Oracle Exadata Database Machine Maintenance Guide
       http://wd0338.oracle.com/archive/cd_ns/E50790_01/doc/doc.121/e51951.pdf

Chapter 4
Section: Changing the NTP Servers
Changing the NTP Servers
Pg 4-38 -- 4-42
Database Machine servers and switches to the same servers. Oracle recommends
changing each server one at a time.
■   Task 1, "Set the NTP Server Address on the Database Server"
■   Task 2, "Set the NTP Server Address on the Sun Datacenter InfiniBand Switch 36 Switch"
■   Task 3, "Set the NTP Server Address on the Cisco Ethernet Switch"
■   Task 4, "Set the NTP Server Address on Exadata Storage Server"
■   Task 5, "Restart Oracle Database Machine"

References

<NOTE:1342281.1> - How do I find the Exadata documentation, such as Owner and User Guide?
<NOTE:1188080.1> - Steps to shut down or reboot an Exadata storage cell without affecting ASM
http://wd0338.oracle.com/archive/cd_ns/E50790_01/doc/doc.121/e51951.pdf

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