Nearline storage is a third-party solution that migrates least-used data from faster storage disks to a less-expensive storage disk. For NSS volumes, the third-party software uses the Migration attribute to identify which volumes participate in nearline storage.
If the Migration attribute is set for the NSS volume that you want to move or split, some of the volume’s data might reside on nearline storage. The Move Volume and Split Volume tasks demigrate the files from the secondary storage, then copy the files to the new location. Make sure the original volume and new volume have enough space to incorporate both inline and nearline files to allow the data demigration.