No device is faster than its connection to its data source. Current backup devices connect using standard SCSI or fibre interfaces. The following table lists the common varieties.
|
Version |
Bus Width |
Approximate Maximum Data-transfer Rate |
|---|---|---|
|
Wide Ultra SCSI |
16 bits |
40 MB/seconds=144 GB/hour |
|
Ultra2 SCSI |
8 bits |
40 MB/seconds=144 GB/hour |
|
Wide Ultra2 SCSI |
16 bits |
80 MB/seconds=288 GB/hour |
|
Ultra 160 SCSI |
16 bits |
160 MB/seconds=576 GB/hour |
|
Ultra 320 SCSI |
16 bits |
320 MB/seconds=1152 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.
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