User's Guide
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The Scalar AIT 220 includes two data cartridge magazines and
either one or two 3.5” form factor Sony
AIT
tape drives. It can
operate as three SCSI devices on up to three SCSI buses. When the
library is is equipped with AIT-1 drives, the library is a differential
SCSI-2 device and the drives are differential Fast/Wide SCSI-2
devices. When equipped with AIT-2 drives, the library can be
configured as a high voltage differential (HVD) Wide Ultra SCSI
device, or as a low voltage differential (LVD) Wide Ultra SCSI
device.
When operating with two AIT-2 tape drives and assuming an
average data compression ratio of 2:1, the Scalar AIT 220 can store
up to 2.0 terabytes of information on 20 Advanced-Metal
Evaporative (AME
) data cartridges (SDX2-50C).
Employing the 3.5” form factor AIT-2 drive, the Scalar AIT 220
provides a maximum sustained data transfer rate of over 720 MB
per minute (assuming 2:1 data compression). The Wide Ultra SCSI
drive does not require periodic head cleaning as often as many
conventioanl tape drives. The drive constantly moinitors head
output to check for possible contamination. If present, the drive
will invoke a built-in Active Head Cleaner. Under extreme
operating conditions, a cleaning cartridge may be required and the
drive indicates this by displaying a Cleaning Request message on
its front panel Status LED.