Computer Associates ARB6002700WF0. ..... Administration Guide - Page 43

Defining Data-transfer Requirements Tape Drives Version Bus Width Approximate Maximum Data-transfer Rate Wide Ultra2 SCSI 16 bits 80 MB/seconds=288 GB/hour Ultra 160 SCSI 16 bits 160 MB/seconds=576 GB/hour Fibre Channel 1 GB 100 MB/seconds=360 GB/hour Fibre Channel 2 GB 200 MB/seconds=720 GB/hour You can see that many of the SCSI interfaces and fibre interfaces will be able to handle your requirement of 200 GB per hour. For example, if you are using a Wide Ultra2 SCSI you can achieve 200 GB in less than an hour. Even if you are using a slower SCSI controller you can use multiple SCSI controllers to achieve the aggregate data transfer rate of 200 GB per hour. Obviously, the SCSI bus or fibre interface should seldom limit your ability to achieve your required data transfer rate. Any of these SCSI varieties could easily meet the 40 GB per hour requirement in our example. Indeed, most could handle the whole 200-GB job in under two hours. A Wide Ultra 160 SCSI could do it in about 30 minutes. There are many kinds of devices. A few of the most common are listed in the following table. Device type DDS-4 AIT-2 AIT-3 DLT 7000 DLT 8000 Super DLT Approximate Transfer rate 2:1 (compressed data) 6.0 MB/seconds=21.0 GB/hour 12.0 MB/seconds=43.2 GB/hour 31.2 MB/seconds=112.3 GB/hour 10.0 MB/seconds=36.0 GB/hour 12.0 MB/seconds=43.2 GB/hour 24.0 MB/seconds=86.4 GB/hour Maximum Capacity (compressed data) 40 GB 100 GB 260 GB 70 GB 80 GB 220 GB Planning 2-5