Premium Controllers Under Scrutiny: Ultra160 RAID Adapters from Adaptec and LSI

RAID 5 And IDE? No, Thank You!

Furthermore, the IDE standard only permits two drives per channel, which, in practice, limits the total number of useable drives to a dozen at the most. Dual-channel SCSI controllers can, by contrast, serve up to 15 drives per bus.

Even in terms of handling, there are shortcomings with IDE: while so-called Hot Plugging (the exchange of a drive without restarting the system) has for years been common practice with SCSI, this is only possible with a few IDE controllers. In addition, the necessary mobile rack systems are still rather scarce.

Last but not least, a further weak point in the IDE segment is the implementation of RAID 5 solutions within acceptable price ranges. If you do not wish to use the system processor to capacity, you will have to use an RISC chip. The more storage space (cache) available, the better this chip will work.

In summary: SCSI is quick, reliable, flexible and compatible. And SCSI is expensive - this factor is, however, quite acceptable in the server segment, provided that the system works quickly and reliably.

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Patrick Schmid
Editor-in-Chief (2005-2006)

Patrick Schmid was the editor-in-chief for Tom's Hardware from 2005 to 2006. He wrote numerous articles on a wide range of hardware topics, including storage, CPUs, and system builds.