Not all application packages are capable of using Persistent Reservations, and not all tape subsystem hardware can handle Persistent Reservations, so NetApp also supports using the older style SCSI re...Not all application packages are capable of using Persistent Reservations, and not all tape subsystem hardware can handle Persistent Reservations, so NetApp also supports using the older style SCSI reserve/release commands. More precisely, the option is in force when a tape drive or medium changer is opened and determines the reservation method used on that device until it is closed.