Also, when there are ghost devices, tape device drivers may "disappear" or roll back to the previous drivers after a tape device driver update. This information is being pulled from the operating system and can incorrectly associate tape device information with the NetBackup hardware configuration. Running the device discovery wizard in NetBackup, for example, may list 20 tape drives when only 10 tape drives physically exist. Under these circumstances, hardware instability can result. These "ghost" devices can retain Port, SCSI, Target, and logical unit number (LUN) information that conflict with the active devices being used by Windows. These sort of things allow changes to the SCSI device path presentation of a device to the operating system. Some of these include adding or removing hardware, changes to tape drives or tape libraries, failure to use persistent binding, static indexing, or hard ALPAs on storage area network (SAN) equipment. Several things can contribute to the addition of ghost devices in the Windows Device Manager. ![]() ![]() ![]() N/A: Symptoms such as drives going down, backups to tape not running, and more may be experienced. There are "ghost" or "phantom" devices from the Windows Device Manager when using NetBackup Error Message
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