When a structure rebuild has been initiated, it can be stopped for any one of several reasons.

• An MVS operator can stop a structure rebuild for structure.
• MVS automatically stops a rebuild if the new structure being created fails or becomes inaccessible.
• A VTAM node in a generic resource configuration can stop a structure rebuild if it loses access to the new version of the structure. A VTAM node never stops a structure rebuild when the old version of the structure has failed.
• A VTAM node in a generic resource configuration can stop a structure rebuild when it determines that all of the data in the old version of the structure might not be available for creating the new version of the structure.

When a structure rebuild is stopped, the old version of the structure continues to be used (if possible) and the new version of the structure, if allocated, will be deallocated.