error install storage mirror.

[mms_2]

I am installing storage mirror in one cluster windows 2003 exchange, but finised with following error:
error creating double-take group.
I use admin domain. This user start cluster services also. I have tried to install with the administrator local, but the error is the same.

any idea?

Thanks

[Francisco Mata_1]

I think you should be administrator of the domain (if using domain groups). Otherwise, try creating the groups before, and then reinstalling storage mirroring.