SL150/LTO - What is a Ghost Drive in the Library

Asset ID:	1-71-2277700.1
Update Date:	2017-06-23
Keywords:

Solution Type Technical Instruction Sure

Solution 2277700.1 : SL150/LTO - What is a Ghost Drive in the Library

Applies to:

StorageTek SL150 Modular Tape Library - Version All Versions and later
LTO Tape Drive - Version All Versions and later
Information in this document applies to any platform.

Total EWI Count: 3
Warning Reason(s): ghost_drive_at_502 ghost_drive_at_503 ghost_drive_at_504

Goal

Definition of a Ghost Drive in the library.

Solution

If the customer was running the default config of "Addressing All Drive Slots" and they change or replace a drive, then they might have "Ghost" drives show up in the configuration details of the SL150, until they reboot.

The support action states that if the customer changes the setting to "Address Only Installed Drives" then it will clear the "Ghost" drive from the config.

It should be mentioned that if 'Address Only Installed Drives' is used, then any loss of a drive may cause the host to re-address the drives when a new one is added, thus changing SCSI addresses. This means that the customer will need to reconfigure the drives on the host to see them correctly. This means drives can't safely be hot-plugged when this option is set and why 'Address All Drive Slots' is the default. Reference Chapter 4 of the StorageTek SL150 Modular Tape Library User's Guide for more details.

Typically, in the config tab, when you have a Ghost drive, you can see a drive that is valid that has all of the fields populated and then a drive, with the same S/N, that doesn't have any of the fields populated... that one is the "Ghost" drive.

Following is taken from the Config page in Service Bundle:

Drive Information
1 HU1215N28A Ultrium 5-SCSI Y68S 0 10.0.0.1 Fibre 0,1,1,11 false false false false OK <----------------- Only 2 of the 5 drives are being presented.
2 HU1323W1TN Ultrium 5-SCSI Y68S 0 10.0.0.1 Fibre 0,1,2,11 false false false false OK

Drive
Id Port # WWN Node Name WWNPortName PortEnabled SpeedInGb Topology Hard Address
1 1 500104f000d11ab8 500104f000d11ab9 true 4 GB Point to Point false
2 1 500104f000d11abb 500104f000d11abc true 4 GB Point to Point false
3 1 500104f000d11abe 500104f000d11abf true 4 GB Point to Point false
4 1 500104f000d11ac1 500104f000d11ac2 true 4 GB Point to Point false
5 1 500104f000d11ac4 500104f000d11ac5 true 4 GB Point to Point false

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