Making A Connection Through An Arbitrated-Loop Topology; Switching I/O Operations Between The Primary And Secondary Paths; Configuring Storage; Configuration Considerations - IBM TotalStorage DS6000 Attachment Manual

Figure 74. Example of an edited /etc/failover.conf file
2. Use the IRIX /sbin/scsifo -d command to confirm the failover configuration.

Making a connection through an arbitrated-loop topology

Making a connection through an arbitrated-loop topology
1. Edit the /etc/failover.conf file to add primary and secondary paths to storage unit
Figure 75. Example of an edited /etc/failover.conf file for an arbitrated loop connection
2. Use the IRIX /sbin/scsifo -d to confirm the proper failover configuration.

Switching I/O operations between the primary and secondary paths

Switching I/O operations between the primary and secondary paths
Use the sbin/scsifo -s command to manually switch from the primary path to the
alternate path. With this command, you can also specify the path from where you
want to switch within a failover group. For example, you might want to perform this
action to switch back to the initial primary path after a path failure.

Configuring storage

The following sections describe how to configure storage in either a switched-fabric
or arbitrated-loop topology.

Configuration considerations

This section provides configuration considerations.
Note: The /hw directory is used to build the hardware graph. The hardware graph
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c6lun0 5005076300c09174/lun0/c6p30000 \
5005076300c09174/lun0/c8p70000
c6lun1 5005076300c09174/lun1/c8p70000 \
5005076300c09174/lun1/c6p30000
c6lun2 5005076300c09174/lun2/c6p30000 \
5005076300c09174/lun2/c8p70000
c6lun3 5005076300c09174/lun3/c8p70000 \
5005076300c09174/lun3/c6p30000
LUNs. Figure 75 shows an example of an edited /etc/failover.conf file that adds
paths to the storage unit LUNs.
GroupA sc3d0l11 sc4d0l11
GroupB sc3d0l17 sc4d0l17
represents the collection of all significant hardware that is connected to a
system. Do not specify the /hw entries in commands that pertain to disk
devices. Use the traditional /dev/rdsk entries instead. The following example
shows a naming convention for the disk devices.