2
easyRAID Q12+
Serial ATA II Disk Array Systems
1
Syste
m
Re
quir
em
ents –
Host Interface
The disk array system has either dual SCSI interfaces or dual fibre channel interfaces. Refer to
the following sections to understand host interface system requirements.
Small Computer Systems Interface
The easyRAID Q12+U4R2 has dual Ultra320 SCSI interfaces that are compatible with previous
SCSI standards. Refer to the following table to understand SCSI bus requirements.
Fibre Channel Interface
The easyRAID Q12+F2R2 has dual 2 Gbit fibre channel interfaces with SFP connectors for link-
age to a fibre channel switch or host computer interface card. With the correct SFP transceiver
and optical cable, the following transmission distances can be achieved.
Note
Subtract the internal cable length (30 cm) from the maximum SCSI bus
length to calculate the maximum external SCSI cable length.
SCSI
Standard
Maximum
SCSI Bus Length
in Meters
Data Rate
in Megabytes
per Second
Maximum
Number of Devices
Ultra320
12
320
15
Ultra160
12
160
15
Ultra2
12
80
15
Ultra Wide
1.5
40
7
Fast Wide
3
20
15
Ultra
1.5
20
7
Component
Optical
SFP Transceiver
LC Optical
Cable
Short Wave
Long Wave
Maximum Cable Length
50m
10 Km
