MVS guarantees that a dataonly volume being unavailable does not cause a metadataok volume to be unavailable. This allows you to mount a multi-volume file system even if one or more component dataonly volumes are missing.
The volumes are separated by whether metadata is allowed on the volume. An I/O error on a dataonly volume does not affect access to any other volumes. All VxFS operations that do not access the missing dataonly volume function normally.
Some VxFS operations that do not access the missing dataonly volume and function normally include the following:
Volume availability is supported only on a file system with disk layout Version 7 or later.