x86 하드웨어 대한 윤초현상( Leap Second)

x86하드웨어 관련에는 큰 문제가 없는것으로 확인이 됩니다

OS나 소프트웨어쪽이 가장 영향이 큰가 봅니다.

 

수동이나 NTP로 동기화 하면 됩니다

대상 장비는 아래에 있으며 왠만한 장비는 다 되는걸로 확인됩니다.

 

 

 

 

https://support.lenovo.com/kr/ko/documents/ht116137

 

 

Leap second for Lenovo hardware, servers, software and tools - Lenovo x86 servers

Symptom

A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time

Leap seconds can be introduced in UTC at the end of the months of December or June, depending on the evolution of UT1-TAI.

Since this system of correction was implemented in 1972, 26 leap seconds have been inserted, the most recent on June 30, 2015 at 23:59:60 UTC, and the next leap second will be inserted on December 31, 2016, at 23:59:60 UTC.

For more information please refer to:                           
                                                                
     https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat        
     https://en.wikipedia.org/wiki/Leap_second                                                                                 

If, for example, users do not have Lenovo hardware, servers, software and tools configured for Network Time Protocol (NTP) synchronization, the clock will have to be adjusted manually due to leap second clock drift.                                 

For industry provided Operating Systems and Applications, contact the supplier for information regarding compliance with Leap Seconds.

Affected configurations

The system may be any of the following Lenovo servers:

• Lenovo Storwize V3500 Controller Enclosure, Type 6096, any model
• Lenovo Storwize V3700 Controller Enclosure, Type 6099, any model
• Lenovo Converged HX3310 Nutanix Appliance, Type 8693, any model
• Lenovo Converged HX3500 Nutanix Appliance, Type 5462, any model
• Lenovo Converged HX5500 Nutanix Appliance, Type 5462, any model
• Lenovo Converged HX5510 Nutanix Appliance, Type 8695, any model
• Lenovo Converged HX7500 Nutanix Appliance, Type 5462, any model
• Lenovo Converged HX7510 Nutanix Appliance, Type 8695, any model
• Lenovo D1024, any model                                   
• Lenovo DX8200C, any model, any 5120                        
• Lenovo DX8200N, any model, any 5128                        
• Lenovo E1012, any model                                    
• Lenovo E1024, any model
  
• Lenovo Flex System Carrier-Grade Chassis, type 7385, any model, any xxx
• Lenovo Flex System Enterprise Chassis, Type 8721, any model
• Lenovo Flex System Enterprise Chassis, Type 8724, any model
• Lenovo Flex System x240 Compute Node, Type 2588, any model
• Lenovo Flex System x240 Compute Node, Type 7162, any model, any model
• Lenovo Flex System x240 M5 Compute Node, Type 2591, any model
• Lenovo Flex System x240 M5 Compute Node, Type 9532, any model
• Lenovo Flex System x280 X6 Compute Node, Type 4258, any model
• Lenovo Flex System x280 X6 Compute Node, Type 7196, any model
• Lenovo Flex System x440 Compute Node, 2590 (4-Year Warranty), any model
• Lenovo Flex System x440 Compute Node, Type 7167 (3-Year Warranty), any model
• Lenovo Flex System x480 X6 Compute Node, Type 4258, any model
• Lenovo Flex System x480 X6 Compute Node, Type 7196, any model
• Lenovo Flex System x880 X6 Compute Node, Type 4258, any model
• Lenovo Flex System x880 X6 Compute Node, Type 7196, any model
• Lenovo N3310, any model                                    
• Lenovo N4610, any model
• Lenovo NeXtScale n1200 DWC Enclosure, Type 5468, any model, any any model
• Lenovo NeXtScale n1200 DWC Manifold, Type 5469, any model, any nx360 M5
• Lenovo NeXtScale nx360 M5 AC, Type 5465, any model
• Lenovo NeXtScale nx360 M5 WC, Type 5467, any model
• Lenovo S2200, any model                                 
• Lenovo S3200, any model                                    
• Lenovo SA120, any model
  
• Lenovo Storwize V5000 Controller Enclosure, Type 6094, any model
• Lenovo Storwize V7000 Controller Enclosure, Type 6195, any model
• Lenovo System x3250 M6, Type 3633, any model
• Lenovo System x3250 M6, Type 3943, any model
• Lenovo System x3500 M5, Type 5464, any model
• Lenovo System x3550 M5, Type 5463, any model
• Lenovo System x3550 M5, Type 8869, any model
• Lenovo System x3650 M5, Type 5462, any model
• Lenovo System x3650 M5, Type 8871, any model
• Lenovo System x3750 M4, Type 8753, any model
• Lenovo System x3850 X6, Type 6241, any model
• Lenovo System x3950 X6, Type 6241, any model
• ThinkServer RD350, any model
• ThinkServer RD450, any model
• ThinkServer RS140, any model
• ThinkServer SD350, any model
• ThinkServer TS140, any model
• ThinkServer TS150, any model
• ThinkServer TS440, any model
• ThinkServer TS450, any model

The system is configured with at least one of the following:

• Flash Update (UEFI, IMM, FPGA, DSA Preboot), any
• Lenovo Dynamic System Analysis (DSA) 10.0, any model
• Lenovo Dynamic System Analysis (DSA) 10.1, any model
• Lenovo Dynamic System Analysis (DSA) 10.2, any model
• Lenovo Dynamic System Analysis (DSA) Preboot 10.0, any model
• Lenovo Dynamic System Analysis (DSA) Preboot 10.1, any model
• Lenovo Dynamic System Analysis (DSA) Preboot 10.2, any any, any model
• Lenovo OneCLI, any Lenovo Utility
• Lenovo ThinkServer Deployment Manager, any
• Lenovo XClarity Administrator, any N/A, any version
• Lenovo XClarity Integrator for vCenter vSphere, any 4.1, any version
• ServerGuide Release 10.0, any release, any Release 10.0
• ServerGuide Release 10.1, any release, any release 10.1
• ServerGuide Release 10.2, any release, any release 10.2
• UpdateXpress Service Pack Installer, any version

The system is configured with one or more of the following Lenovo Options:

• Lenovo Chassis Management Module II, any 00FJ669
• Lenovo Flex System Fabric CN4093 10Gb Converged Scalable Switch, Option 00FM510, any CRU
• Lenovo Flex System Fabric CN4093 10Gb Converged Scalable Switch, Option 00FM512, any model
• Lenovo Flex System Fabric CN4093 10Gb Scalable Switch, Option 00FM510, any AC1
• Lenovo Flex System Fabric EN4093R 10Gb Scalable Switch, Option 00FM514, any CRU, any model
• Lenovo Flex System Fabric EN4093R 10Gb Scalable Switch, Option 00FM516, any model
• Lenovo Flex System Fabric SI4093 System Interconnect Module, Option 00FM518, any 00FJ669 , any CRU
• Lenovo Flex System Fabric SI4093 System Interconnect Module, Option 00FM520, any model
• Lenovo Flex System SI4091 10Gb System Interconnect Module, Option 00CG542, any model
• Lenovo Flex System SI4091 10Gb System Interconnect Module, Option 00FE327, any CRU, any model
• Lenovo Storage Enclosure EXP2500, Type 6100-12X (LFF), any model
• Lenovo Storage Enclosure EXP2500, Type 6100-24X (SFF), any model
• Lenovo Storage Expansion SAS IO Module FRU - 00WC085         
• Lenovo Storage S2200 FC and iSCSI Controller FRU - 00WC081   
• Lenovo Storage S2200 SAS Controller FRU - 00WC082            
• Lenovo Storage S3200 FC and iSCSI Controller FRU - 00WC083    
• Lenovo Storage S3200 SAS Controller FRU - 00WC084
  

The system has the symptom described above.

Note: This does not imply that the network operating system will work under all combinations of hardware and software.
Please see the compatibility page for more information:

http://www.lenovo.com/us/en/serverproven/

Solution

Enable NTP synchronization or manually adjust the clock from time to time if NTP synchronization is not enabled for leap second.

Refer to the following links for more information on leap second:

     https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat
     https://en.wikipedia.org/wiki/Leap_second

Workaround

If Lenovo hardware, servers, software and tools are not configured for NTP synchronization, the time will have to be adjusted manually from time to time for the leap second.

Additional information

The next positive leap second will be introduced at the end of December 2016. The sequence of dates of the UTC second markers will be:

     2016 December 31, 23h 59m 59s
     2016 December 31, 23h 59m 60s
     2017 January   1,  0h  0m  0s

Refer to following links for more information:

     https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat
     https://en.wikipedia.org/wiki/Leap_second

Configure NTP synchronization or the time will have to be adjusted manually for the leap second.

Manual re-adjustments should be done periodically due to forward or backward clock drift when the clock is not NTP synchronized.