HP StorageWorks Scalable File Share System Installation and Upgrade Guide Version 2.2

Overview1–14
1.4.2.2 Mirrored dual-connected SFS20 configuration
A mirrored dual-connected configuration consists of two pairs of SFS20 arrays, all of which are connected
to both servers in an Object Storage Server pair. One of the servers accesses one of the SFS20 arrays and
mirrors the data to a second SFS20 array. The second server does the same on a second pair of SFS20
arrays.
Figure 1-10 shows a mirrored dual-connected SFS20 configuration. (For a more detailed view of
connections in SFS20 configurations, see Figure 1-25.)
Figure 1-10 Mirrored dual-connected SFS20 configuration
A mirrored dual-connected configuration consists of the following components:
• Two Object Storage Servers
• Four SFS20 arrays (see Table 1-2)
• Eight SCSI cables
• At least one Smart Array 6404 HBA per server
A variation of this configuration has two more pairs of SFS20 arrays per server pair, using up to two Smart
Array 6404 HBAs on each server. This is the maximum configuration.
A mirrored dual-connected SFS20 configuration tolerates all of the failures that are tolerated by the non-
mirrored dual-connected configuration. In addition, it also tolerates the failure of an individual SFS20
controller, as data written to any one SFS20 array is duplicated on another SFS20 array. Software mirroring
takes care of data integrity, rebuilds, and so on.
SFS20 3
SFS20 4
Server 1 Server 2
6404
SFS20 2
A1 A2 B1 B2
6404
A1 A2 B1 B2
SFS20 1
Failover
Failover
Normal
Access
Normal
Access