Copy policy override
Use this page to override local copy and I/O policies for a given IBM® TS7700 Cluster.
For the selected cluster, you can tailor copy policies to override
certain copy or I/O operations. Select the check box next to one or
more of the following settings to specify a policy override:
- Prefer local cache for scratch mount requests
- When this setting is selected, a scratch mount
selects the local tape volume cache if:
- The Copy Mode field defined by the management class for the mount has a value other than No Copy defined for the local cluster,
- The Copy Mode field defined for the local cluster is not Deferred when one or more peer clusters are defined as Rewind Unload (RUN), AND
- The local cluster is not in a degraded state. Examples of a degraded
state include:
- Out of cache resources
- Out of physical scratch
Note: The cluster is not required to have a valid copy of the data to enable this override setting. - Prefer local cache for private mount requests
- This override causes the local cluster to satisfy the mount request
if:
- The cluster is available, AND
- The local cluster has a valid copy of the data, even if that data is only resident on physical tape
- Force volumes mounted on this cluster to be copied to the local cache
- When this setting is selected for a non-scratch mount, a copy operation is performed on the local cluster as part of the mount processing.
- Allow fewer RUN consistent copies before reporting RUN command complete
- When this setting is selected, the maximum number of Rewind/Unload (RUN) copies, including the source, is determined by the value entered at Number of required RUN consistent copies including the source copy. This value must be consistent before the RUN operation completes.
- Ignore cache preference groups for copy priority
- If this option is selected, copy operations ignore the cache preference group when determining priority of volumes copied to other clusters.
Note: These settings override default TS7700 behavior
and can be different for every cluster in a grid.
To change
any of the settings on this page:- Check or clear the box next to the setting you want to change.
- If you enable Allow fewer RUN consistent copies before reporting RUN command complete, you can alter the value for Number of required RUN consistent copies including the source copy.
- Click the Submit Changes button.