Volume availability

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:

Some operations that could fail if a dataonly volume is missing include:

Volume availability is supported only on a file system with disk layout Version 7 or later.

Note:

Do not mount a multi-volume system with the ioerror=disable or ioerror=wdisable mount options if the volumes have different availability properties. Symantec recommends the ioerror=mdisable mount option both for cluster mounts and for local mounts.