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
