Dot Hill Systems II 200 FC service manual A Sample DAS Loop Configuration

7.Map logical drive 0 to channels 0 and 1 of the primary controller.

Map LUN numbers 0 through 31 to the single ID on each host channel.

8.Map logical drive 1 to channels 4 and 5 of the secondary controller.

Map LUN numbers 0 through 31 to the single ID on each host channel. Since each set of LUNs is assigned to two channels for redundancy, the total working maximum number of LUNs is 64 LUNs.

Note – The LUN ID numbers and the number of LUNs available per logical drive can vary according to the number of logical drives and the ID assignments you want on each channel.

9.Connect the first switch to ports 0 and 4 of the upper controller.

10.Connect the second switch to ports 1 and 5 of the lower controller.

11.Connect each server to each switch.

12.Install and enable multipathing software on each connected server.

The multipathing software prevents path failure but does not alter the controller redundancy through which one controller automatically takes over all functions of a second failed controller.

5.1.3A Sample DAS Loop Configuration

The typical direct attached storage (DAS) configuration shown in Figure 5-3and Figure 5-4includes four servers, a dual-controller array, and two expansion units. Expansion units are optional.

Note – The SATA SE array does not support expansion units.

Servers, as shown in Figure 5-3and Figure 5-4,are connected to the following channels:

Table 5-2Connection for Four Servers in a DAS Configuration

Server
Number	Upper I/O Controller Module	Lower I/O Controller Module
1	0	5
2	4	1
3	5	0
4	1	4

5-10SANnet II 200 FC, SATA, and SATA SE Array Installation, Operation, and Service Manual • March 2005