how to assign the policy type is sync or async when create snapmirror

[AllenChang]

I use the new-ncsnapmirror to create a snapmirror,

but when it created and initialized finished,

I found it is an async-mirror policy type,

how to define the policy become sync-mirror in new-ncsnapmirror ?

 or modify the policy become sync-mirror after snapmirror created?

Thanks

[Sergey_Osipov · Accepted solution]

It is not possible to just modify a policy to sync of existing snapmirror relationship

https://kb.netapp.com/onprem/ontap/dp/SnapMirror/How_to_convert_the_SnapMirror_Relationship_between_Asynchronous_and_Synchronous

Regarding the new-ncsnapmirror to create a snapmirror

from the new-ncsnapmirror webhelp

 -Policy <String>
        Specifies the name of the snapmirror policy for the relationship. For 
        SnapMirror relationships of type 'vault', the policy will also have 
        rules to select snapshot copies that must be transferred. If no policy 
        is specified, a default policy will be applied depending on the type of 
        the SnapMirror relationship. This parameter is only available on Data 
        ONTAP 8.2 or later if the relationship control plane is 'v2'.
        
        Required?                    false
        Position?                    named
        Default value                
        Accept pipeline input?       true (ByPropertyName)
        Accept wildcard characters?  false

[AllenChang]

Hi Sergey 

If I want create a synchronous snapmirror

How should I use the new-ncsnapmirror command to finish this task?