9.1 Overview

---

9.1 Overview

The System Logger environment consists of several components, and the data across all the components must be in a time consistent state for it to be used during a disaster recovery situation. These pieces include:

• The System Logger policy (which records the list of offload data sets associated with each log stream along with the highest used RBA in the current data set)

• The catalog structure (which maintains the location of all the System Logger data sets)

• The System Logger coupling facility structures

If you dump the volume with the master catalog (or user catalog) on it and then dump the volume with the System Logger policy on it, then the policy might indicate that certain data sets should exist, but those data sets might not be reflected in the catalog.

If your goal is to preserve the System Logger environment without losing any data, then you cannot rely on volume dumps to transport the data to the recovery site.

---