How the 2015 UTC leap second affects Cisco UCS Performance Manager

Applies To

  • Zenoss Resource Manager 5.0 appliance
  • Cisco UCS Performance Manager 1.x appliance


Leap seconds are one second adjustments to UTC time to maintain synchronization with mean solar time. The next leap second is scheduled to be inserted to UTC on June 30th, 2015 at 23:59:60 UTC ( Linux systems running Network Time Protocol (NTP) will have the leap second inserted.

The UCS appliance is based on a CENTOS / Red Hat type of operating system. Some of these operating systems have demonstrated stability problems when and if UTC leap seconds are inserted. For additional information about these possible performance problems, see

Zenoss does not enable NTP by default on the UCS appliance. Because NTP is not enabled by default, UCS instances should experience no issues as a result of the leap second insertion.


If NTP has been enabled on a UCS appliance and system instability is encountered, reboot the appliance using the Reboot option (available from the Admin menu of your appliance) to resolve the issue. See the Cisco UCS Performance Manager Installation Guide for instructions about how to access the Admin menu.

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