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Why is the scsi bus type important, Internal drives, External drives – HP StoreEver Ultrium Tape Drives User Manual

Page 14: Removable drives

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You will need a properly installed and configured SCSI host bus adapter (HBA) or a built-in

SCSI controller on your server and a suitably-rated SCSI cable. See also

Why is the SCSI bus

type important?

.

For optimum performance the drive should be the only device on the SCSI bus.

Always terminate the SCSI bus. Ultrium internal and removable tape drives require terminators;

external drives are auto terminating, as long as they are on a dedicated SCSI bus or the last

device on a chain.

Do not attach the drive to the same SCSI bus as your disk drive or to a RAID controller (unless you

are connecting to a ProLiant server with a Smart Array 6i RAID controller).

NOTE:

Always refer to

http://www.hp.com/go/connect/

to ensure that you are connecting to a supported

HBA running the recommended firmware version.

Internal drives

The tape drive is installed into a spare, industry-standard, 5¼-inch, full-height drive bay in your server

(or into an HP Rack-Mount Option Kit) and is attached to the SCSI bus of the host server. Use an

LVDS-compatible ribbon cable to connect the tape drive to a spare 68-pin, high density (HD), wide

SCSI connector on the host server. For most servers we recommend that you use the terminated SCSI

ribbon cable supplied with the drive.
See also

Installing an internal Ultrium tape drive

.

External drives

Your tape drive is supplied with a 68-pin, wide, VHD-to-HD SCSI cable to attach to the host server.

See also

Installing an external Ultrium tape drive

.

Check the usage models on

Usage models

. This shows how the HP StorageWorks Ultrium tape drive can

be used in different system architectures.

Removable drives

The individual tape drives are connected to their host server via the high-density LVD/SE SCSI connectors

on the back of the tape array. They do not require any SCSI cables to plug into the tape array. However,

cabling and terminators are required to connect the tape array with the SCSI host. See also

Installing a

removable Ultrium tape drive

.

Why is the SCSI bus type important?

The SCSI bus type determines the speed at which data can be transferred between devices on the bus

and the maximum length of cable that can be used. HP Ultrium 1840 and 960 drives support a burst

transfer rate of 320 MB/sec. HP Ultrium 460 drives support a burst transfer rate of 160 MB/sec. To

benefit from this level of performance, it is important to ensure that the drives are connected to a SCSI

bus of a similar or higher specification. This means that you need:

An Ultra320 bus for HP Ultrium 1840 and 960 drives. An Ultra160 or Ultra320 SCSI bus for

HP ultrium 460 drives. If you attach the drive to a lower specification SCSI bus, it may still

work but data will not be transferred as quickly.

LVD-rated SCSI cabling and terminators. The LVD interface enables the data to be transferred at

the drive’s maximum rate.

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