Dot Hill Systems II 200 FC service manual Host Port Connectivity in a Dual-Controller Array

Two drive ports on channel 3

Two drive ports on channel 2

An upper port and a lower port are on each drive channel.

Figure 4-13Dedicated Drive Channels 2 and 3 (on Both Controllers) in a Dual-Controller SANnet

II200 SATA Array

4.8.2Host Port Connectivity in a Dual-Controller Array

Host channels connect to host computers either directly or through storage switches or other devices. In a default dual-controller RAID configuration, each controller has four host channels, channels 0, 1, 4, and 5. Port bypass circuits connect each pair of host SFP ports on a host channel; as a result, each host channel accesses both controllers.

The main differences between the SANnet II 200 FC, SATA, and SATA SE arrays are the number of host ports and the supported speed for each port (see Table 4-6).

Table 4-6Number of Host Ports and Supported Host Port Speeds

Data Transfer
Speed		SANnet II 200 FC Array	SANnet II 200 SATA and SATA SE Array
1	Gbit or 2-Gbit	Maximum of 4 host ports per	Maximum of 4 host ports (FC 0 and FC 1)
		I/O controller module	per I/O controller module
2	Gbit only	N/A	Maximum of 2 host ports (FC 4 and FC 5)
			per I/O controller module

4.8.2.1SANnet II 200 FC Array

In a default dual-controller RAID configuration, each controller has four host ports. Each port connects to one host channel, channels 0, 1, 4, and 5 (see Figure 4-14). All four host channels support 1-Gbit or 2-Gbit data transfer speeds. Each host channel has un upper port and a lower port.

Chapter 4 Connecting Your Array 4-19