hyper v hosts time sync

hi,

 

i have 3 hyper v nodes setup in csv failover cluster.

two of these sync time pdc master dc uses external time source.

the other host gets time normal dc.

after restarts etc doesn't change.

is there reason this?

i have no gp on time it's recommended default settings take effect have configured pdc use external ntp time source should filter down domain hierarchy

ps- pdc dc physical server , not vm.

 

 

hi

according ben armstrong ( microsoft virtualization program manager  )

question #6 – wait minute!  virtual machine should synchronizing domain (or external server) – when run command tells me hyper-v time synchronization provider being used!  how fix this!

i not know why happens – happens.  first thing should check domain have correctly configured authoritative time source.  there have been small number of times when have seen problem being caused lack of authoritative time source.

so, fix this, can “partially disable” hyper-v time synchronization

to need log virtual machine, open administrative command prompt , run following commands:

reg add hklm\system\currentcontrolset\services\w32time\timeproviders\vmictimeprovider /v enabled /t reg_dword /d 0

this command stops w32time using hyper-v time synchronization integration service moment-to-moment synchronization.  remember earlier in post not go through windows time synchronization infrastructure correct time in event of virtual machine boot / restore saved state or snapshot.  operations unaffected.

w32tm /config /syncfromflags:domhier /update

this command tells windows go , best time source in domain hierarchy.  if want use external time server instead can use commands found here: http://technet.microsoft.com/en-us/library/cc784553(ws.10).aspx

net stop w32time & net start w32time

w32tm /resync /force

these 2 commands “kick windows time service” make sure settings changes take effect immediately.

w32tm /query /source

this final command should confirm working expected.

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________________________________________
alessandro cardoso
mvp | microsoft heroes | mct
blog: http://virtualisationandmanagement.wordpress.com
http://virtualizacaoegerenciamento.wordpress.com

Windows Server  >  Hyper-V