Infortrend manual SR 170 Topologies, Drive Connection, Scsi Termination, Unique IDs

SentinelRAID 170 Installation and Hardware Reference Manual

4.1.4 Drive Connection

Each drive channel can be connected to up to fifteen SCSI-320 hard drives. The maximum number of drives that can be connected to each controller is shown in Table

4-2below:

Model	Host Channels	Drive Channels	Maximum Number of Drives
SR 170	1	3	45
SR 170 + IFT-	1	7	105
9284U4

Table 4-2: Maximum Number of Drives

4.1.5 SCSI Termination

It is important that both the host and drive SCSI cables are properly terminated. If these cables are not properly terminated, then signals being transmitted along the SCSI bus may become corrupted. When multiple drives are connected together (as shown in the topologies below) the SCSI terminators on the individual drives must be disabled.

4.1.6 Unique IDs

SCSI devices connected on the same channel have their own unique ID number. This number allows these individual devices to be recognized by the controller when executing I/O commands from the host computer.

4.2. SR 170 Topologies

4.2.1 Single Host Computer

Connection to a single host is shown in Figure 4-1. The single host computer manages all of the logical drives (LDs). In the topology shown in Figure 4-1the channels are configured as shown in Table 4-3.

Channel	Configured as…
CH0	Host Channel
CH1	Drive Channel
CH2	Drive Channel
CH3	Drive Channel

Table 4-3: SR 170 Single Host Channel Configurations

4-2 SR 170 Topologies