Yes - you only need a single channel unless you start getting quite a few drives. Unless you're doing video encoding or something and streaming huge files to/from disk (thereby reaching your disks max transfer rates) you should have no problems putting quite a few drives on a single channel. On all the servers we have at work we don't use a second SCSI channel unless we have to hook up a second SCSI enclosure (eg. 1 channel for drives internal, 1 channel for drives in external box). Besides the SAN (which is 6 channels, currently each with 13 10KRPM 36GB disks) I can't even think of a server we have that really makes use of a second SCSI channel (probably because all the servers that do that much disk IO are plugged into that SAN)
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