Bosch DVA-12T Installation Manual download pdf (Page 35)

RAID Subsystem DVA-16K | Installation Manual Subsystem Connection and Operation | en 35

Bosch Security System F.01U.027.799 | V2 | 2008.08

5.2 Host Connection Topology

There is no direct association between host ports and drive channels. Drives are associated

with host port IDs as the logical configuration of drives, e.g., a logical drive. A logical drive can

be composed of drives on different drive channels, and a logical drive can be associated with

target IDs on different host ports.

Drive access contention (that may happen when two (2) host computers can access the same

array) and data-path failover activities should be handled by a third-party software running on

host computer(s).

RAID subsystem host channel SCSI connectors are connected to the servers via host bus

adapters (HBAs) that have been installed on the host computer(s).

• Single server connection: If a single logical drive is mapped to a single server, a RAID

management software should be installed in the server to execute RAID functionality.

• Multiple server connection: If a single logical drive is mapped to two (2) separate servers

through dual-redundant data paths, separately purchased, third-party multipathing and

clustering software must be installed on both servers. The clustering software will ensure

that if one (1) server or the data path to a single server fails, the second server will con-

tinue to provide access to the data.

5.2.1 Single Host

In the example shown in Figure 5.2, one of the SCSI ports on the controller rear panel is con-

nected to a single host computer.

Fig. 5.2 Single Host Connection

Single Server

Servers One (1)

Subsystem One (1) subsystem

RAID Controllers One (1)

RAID Level RAID 5

Disk Configuration One (1) or more logical drives

Drives Sixteen (16) drive channels

Host Bus Adapters One (1) single-port SCSI

Data Path Connection Dual-redundant data paths

Table 5.1 Configuration Overview for Single Server Connection

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 71 72

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Bosch DVA-12T Installation Manual Page 35