Typically missing volumes can result from a hardware failure. If the failure does not affect the disk or disks where the snapshot set resides, you can recover from the failure by restoring the missing volumes from the snapshot set.
Before performing the recovery, you complete several steps to prepare for it.
You can then recover the missing volumes using the VSS Restore Wizard or the vxsnap utility.
If the original volume is not present, the snapshot volume is changed from a read-only volume to a read-write volume. No additional transaction logs are applied.