What is the meaning of "group_by_serial" in multipath configuration?

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Linux (RHEL) 5
  • Red Hat Enterprise Linux (RHEL) 6

Issue

  • What is the meaning of group_by_serial in multipath configuration?

Resolution

group_by_serial is one path group per storage controller(serial). All paths that connect to the LUN through a controller are assigned to a path group what can be suitable for devices that are in Active/Passive mode.In this case group_by_serial ensures that paths are grouped by the SCSI target serial number (controller node WWN).In this article is described how to find out WWN numbers.

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