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SentinelRAID 170 Installation and Hardware Reference Manual
4-2 SR 170 Topologies
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
4-2 below:
Model Host Channels Drive Channels Maximum Number of Drives
SR 170
13 45
SR 170 + IFT-
9284U4
17 105
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 4-1 the 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