Bosch Appliances DVA-08K Host Connection Topology, Default Channel Settings, Model, Host Channels

RAID Subsystem DVA-08K Installation ManualSubsystem Connection and Operation en 37

5.3 Host Connection Topology

Fig. 5.2 Cascaded Subsystems Connected to Two Host Computers

In the example shown in Figure 5.2, the SCSI ports are connected to different host computers. This provides both path and host computer redundancy. If one of the host channels becomes disconnected, or if the cable connecting one of the host ports to the host computer is dam- aged, the second path can transmit data from the subsystem to one of the host computers. Similarly, in the clustered hosts configuration, the same array can be accessed through differ- ent data paths and downtime will be minimized.

To obtain more disk capacity, the “Out” ports are used to cascade another subsystem. The host-side connection can be made as the following:

1.Directly to servers or workstations equipped with SCSI HBAs.

2.Connect two subsystems on the same host buses for a larger combined capacity.

3.Cross-link the host ports on subsystem(s) to clustered servers.

High availability configurations, such as clustering or redundant paths settings, can be applied with adequate software control. The same logical array can be associated with two or more different host IDs to facilitate access down through different HBAs.

Default Channel Settings

Model	Host Channels	Drive Channels
DVA-08K	Channel 0 and Channel 1	Channels 1 to 8, each dedicated to
		one connected drive
Table 5.1 Default Channel Settings

Bosch Security Systems F.01U.027.797 V2 2008.08