For storage controls that support hardware bitmaps, suspension of an XRC session has no application performance impact. For storage controls that do not support hardware bitmaps, a suspended XRC session can affect the system environment. The actual impact depends on the configuration, the activity level of the volume pairs in the suspended session, and the primary storage control's timeout value.
The capability of the storage control largely determines what happens when an XRC session becomes suspended. Storage controls that are able to do so manage record updates with a hardware bitmap. For these types of volumes, the outage (planned or unplanned) can be of any duration. The primary impact is that the resynchronization time can be longer for an extended outage.