HP StorageWorks Ultrium Full-Height SCSI Tape Drives User Guide (EH853-90905, August 2007)

The HP Tape Array 5300 has four SCSI ID switches to enable the installation of up to four half-height

drives. When installing two HP Ultrium full-height tape drives, use SCSI ID switches 1 a nd 2 only.

SCSI ID

Bay 4

SCSI ID

Bay 2

SCSI

Bay 3

SCSI ID

Bay 1

Figure 16 SC SI address switch on tape array

3. Make sure that a SCSI terminator is attached to the appropriate SCSI-OUT connector on the back of

the tape a rray.

4. Determine whether you need to change the SCSI ID from the default of 3.

Whydoest

he tape drive need a terminator?

Termina

tors are essential, as they provide the correct voltages on the SCSI bus and prevent unwanted

signal r

eﬂections from interfering with data transfers. The rule is:

There mu

st be termination at bot h physical e nds of t h e bus and only at the ends.

Normally the HBA forms one end of the SCSI bus and provides termination. You, therefore, ne ed to

ensure that the other end of the bus is terminated. Attach the terminator to the appropriate SCSI-OUT

connect

or on the tape array.

Replacing the drive

HP StorageWorks Ultrium removable drives c an be removed and replaced without powering down the

tape array. However you should b e aware of the following:

• If all drives in the tape array are powered up when the system is turned on, the host will be aware

ofthosedrives. Youcanremoveanyofthosedrivesandreplaceitwithanotherdriveaslong

as there is no activity on the bus.

• Do not remove or add drives to a bus that already has drives connected and running, for example

backing up or restoring data. Wait until there is no activity on the bus before removing or

adding drives.

• Ifadriveisnotpowereduporyouplaceadriveinanemptyslotafter the system has been

powered up, the system will have to b e reset before the host will recognize the drive.

• The SCSI I Ds are controlled by the tape array, not by the d rives themselves, so if you remove a

drive and replace it with another the ID will not change.

1. Pull the extraction lever of the drive that you want to replace so that it is in the out position.

Installing a removable Ultrium tape drive