topic PS Script for reverse ReSync cDot in Microsoft Virtualization Discussions

PS Script for reverse ReSync cDot

Cardif — Wed, 04 Jun 2025 22:56:04 GMT

Hi all,

need help by creation a additional DR szenario Powershell script.

Situation

cDot 8.3

Cluster Main - CL1

Cluster DR - CL2

CL1

Volume : SOURCE_VOLUME

vServer: vNFS

CL2

Volume : SOURCE_VOLUME_mirror

vServer: vNFS_repli

Snappmirror Volume (" SOURCE_VOLUME_mirror") between CL1 (source) to CL2 was done

Mirror is broken on CL2

After END of DR szenario i need a reverse Resync form CL2 to CL1 of the mirror volume overwrite the "old" source volume on CL1.

Any idea how to realize this in a powershell script.

Thanks for Help.

Regards

Andreas

Re: PS Script for reverse ReSync cDot

JGPSHNTAP — Fri, 06 Nov 2015 20:36:45 GMT

Is this for a DR test or a real DR

You are looking to flip over and run in alternative site and them flip back?

Also, you have to make sure that unless you are using some form of SVM-DR in 8.3.1, all resources will have to get recreated in DR, either via manual or script (shares,exports, junctions, etc)

Re: PS Script for reverse ReSync cDot

asulliva — Thu, 17 Dec 2015 18:13:10 GMT

Reversing and resyncing a SnapMirror relationship takes a number of steps...roughly, those are:

Check for common snapshots between source and destination.
Remove the existing SnapMirror relationship (use the Remove-NcSnapmirror cmdlet)
Remove snapshots from the original source volume (on CL1 in your example) which are newer than snapshots on the original destination (CL2).
Recreate the SnapMirror relationship (use the New-NcSnapmirror cmdlet) in reverse, where CL2 is the source and CL1 is the destination. It should automatically use the newest common snapshot as the baseline.
Resync the the SnapMirror (use the Invoke-NcSnapmirrorResync cmdlet).

Hope that helps.

Andrew