Installation guide

The multipath Mapping Target
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pathgroup
The next path group to try.
pathgroupsargs
Each path group consists of the following arguments:
pathselector #selectorargs #paths #pathargs device1 ioreqs1 ... deviceN ioreqsN
There is one set of path arguments for each path in the path group.
pathselector
Specifies the algorithm in use to determine what path in this path group to use for the next I/O
operation.
#selectorargs
The number of path selector arguments which follow this argument in the multipath mapping.
Currently, the value of this argument is always 0.
#paths
The number of paths in this path group.
#pathargs
The number of path arguments specified for each path in this group. Currently this number is
always 1, the ioreqs argument.
device
The block device number of the path, referenced by the major and minor numbers in the
format major:minor
ioreqs
The number of I/O requests to route to this path before switching to the next path in the
current group.
Figure A.1, “Multipath Mapping Target” shows the format of a multipath target with two path groups.
Figure A.1. Multipath Mapping Target