EMC

Configuring NTP Services for the VNX / Celerra

I was performing a nas_checkup on the new system I just installed and found this warning:

————Warnings———————

Blades : Check connectivity to NTP servers

Warning HC_DM_18800115743:

* server_2: Only one NTP server is configured. It is recommended to define at least two different NTP servers for a high availability.

If the clock of the Data Mover is not correct, potential errors during Kerberos authentication may happen (timeskew).

Action : Use the server_date command to define another NTP server on the Data Mover. Read the man pages for details and examples.

——————————————

So I must have missed the configuration of the second NTP server, but no problem because there is a procedure for that, right? So this is what happened next:

1. Login into the Unisphere, click on the Home Icon and then of the Domains Tab

home-domains2. On the right column click the Configure NTP link

ntp-config-link

3. Click OK in the Pop-Up Warning Window, and then you can edit you NTP settings, in my case if fact I had only one NTP server defined, so I added the second one

ntp-config-window

4. I executed the nas_checkup again, but I still had the same warning. If you log into the control station with ssh user nasadmin, then you can check the NTP status with this command:

[nasadmin@cs0 tools]$ server_date server_2 timesvc stats ntp
server_2 :
Time synchronization statistics since start:
hits= 45, misses= 0, first poll hit= 2, miss= 0
Last offset: 0 secs, 0 usecs
Current State: Running, connected, interval= 60
Time sync hosts:
10.1.3.10,

See above in bold that only the first NTP server appears in the output, I also tried to stop and start the NTP service, I logged as root and executed the /sbin/service ntpd [stop/start], but the system still reported one NTP server and I still had my warning message.

5. Resolution: I stopped the ntp service and then started it again with both hosts included in the command line.

[nasadmin@cs0 tools]$ server_date server_2 timesvc stop ntp
server_2 : done
[nasadmin@cs0 tools]$ server_date server_2 timesvc start ntp 10.2.3.10 10.1.3.10
server_2 : done
[nasadmin@cs0 tools]$ server_date server_2 timesvc stats ntp
server_2 :
Time synchronization statistics since start:
hits= 1, misses= 0, first poll hit= 1, miss= 0
Last offset: 0 secs, 51 usecs
Current State: Running, connected, interval= 60
Time sync hosts:
10.2.3.10, 10.1.3.10,
[nasadmin@cs0 tools]$

Blades         : Checking connectivity to NTP servers…………………. Pass

And I will be able to sleep tonight.

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