Chapter 1 Library Description
Tape Drives
Quantum PX500 Series User’s Guide
11
Tape Drives
PX500 Series tape libraries are equipped with either SCSI or native Fibre
Channel tape drives. One SCSI or Fibre bus is provided for the library
robotics (gripper) and for each tape drive installed. SCSI buses are SCSI-2
fast/wide (8/16 bit), Ultra 3 SCSI, Ultra 160, or Ultra 320 SCSI, depending
on the drives installed.
LVD SCSI configurations have a maximum allowable bus length of 12
meters. To determine the cable length of the bus, measure the lengths of
the SCSI cables connecting each device to that bus and add those lengths
together. To that total length, add 12.25 inches (31.10 cm) for the internal
SCSI cable length of each SCSI tape drive.
Tape Drive Types
1
PX500 Series libraries support the following tape drives:
• Quantum SDLT320 (SCSI only)
• Quantum SDLT600 (SCSI and Native Fibre Channel)
• Quantum DLT-S4 (SCSI and Native Fibre Channel)
• HP LTO-2 (SCSI only)
• HP LTO-3 (SCSI and Native Fibre Channel)
Refer to the following tables for tape drive performance characteristics.
Both SDLT and LTO tape drive can exist in the same library as long as the
appropriate magazines are installed in the library.
Table 1 SDLT 320
Performance Characteristics
* Compressed capacity assumes a 2:1 compression ratio.
Quantum PX502 SDLT Model (drives/slots)
2/32
Capacity in Terabytes (TB) (160 GB per cartridge)
5.12
*Compressed Capacity in TB (320 GB per cartridge)
10.24
Throughput (GB/hr) based on 16 MB/sec transfer rate
115.2
*Compressed Throughput (GB/hr) based on 32 MB/
sec transfer rate
230.4
