Network compression Snapmirror Volume and Snapmirror qtree with Oncommand Protection Manager?

[hondasuschi]

As network compression is only configurable manually in snapmirror.conf we are not shure, if in case this is written manually in snapmirror.conf, if these values are been read by Oncommand Protcection Manager?   In both cases: Is qtree snapmirrr network compression supported as well?  Thanks for any help.

[smoot]

OnCommand won't be aware you've enabled network compression, either at the volume or qtree level. If ONTAP supports qtree level compression, OC won't do anything to stop it.

That's not entirely true. There are cases when OnCommand will re-write the snapmirror.conf entry and can in the process, disable compression. The case I know of is if you set the hostPreferredAddr1 or hostPreferredAddr2 attributes on a storage system. When you do that, OC needs to add a connection entry for the affected SnapMirror relationships and that can disable compression as a side effect.