MegaRAID Enterprise 1600 Hardware Guide
2
Single Ended and Differential SCSI Buses
The SCSI standard defines two electrical buses:
• a single ended bus
• a differential bus
Maximum Cable Length for SCSI Standards
Standard Single ended LVD Maximum Number
of Drives
SCSI I 6 m 12 m 7
Fast SCSI 6 m 12 m 7
Fast Wide SCSI 6 m 12 m 15
Ultra SCSI 1.5 m 12 m 7
Ultra SCSI 3 m 12 m 3
Wide Ultra SCSI 12 m 15
Wide Ultra SCSI 1.5 m 12 m 7
Wide Ultra SCSI 3 m 12 m 3
Ultra2 SCSI 25 m 1
Ultra2 SCSI 12 m 7
Wide Ultra2 SCSI 25 m 1
Wide Ultra2 SCSI 12 m 15
Maximum cable length for 160M
Standard Single-ended LVD Maximum # of Drives
160M SCSI 25M 1
160M SCSI 12M 7
Wide 160M SCSI 25M 1
Wide 160M SCSI 12M 15
SCSI Bus Widths and Maximum Throughput
SCSI Standard SCSI Bus Width SCSI Throughput
SCSI I 8 bits 5 MB/s
Fast SCSI 8 bits 10 MB/s
Fast Wide SCSI 16 bits 20 MB/s
Ultra SCSI 8 bits 20 MB/s
Wide Ultra SCSI 16 bits 40 MB/s
Ultra2 SCSI 8 bits 40 MB/s
Wide Ultra2 SCSI 16 bits 80 MB/s
160M SCSI 8 bits 80 MB/s
Wide 160M SCSI 16 bits 160 MB/s
