Veritas™ Volume Manager Administrator's Guide

To display the multi-pathing information on a system

• Use the vxdisk path command to display the relationships between the device paths, disk access names, disk media names and disk groups on a system as shown here:

  # vxdisk path

  SUBPATH      DANAME     DMNAME     GROUP    STATE
  c1t0d0       c1t0d0     mydg01     mydg     ENABLED
  c4t0d0       c1t0d0     mydg01     mydg     ENABLED
  c1t1d0       c1t1d0     mydg02     mydg     ENABLED
  c4t1d0       c1t1d0     mydg02     mydg     ENABLED
    .
    .
    .

  This shows that two paths exist to each of the two disks, mydg01 and mydg02, and also indicates that each disk is in the ENABLED state.

To view multi-pathing information for a particular metadevice

1. Use the following command:

   # vxdisk list devicename

   For example, to view multi-pathing information for c1t0d3, use the following command:

   # vxdisk list c1t0d3

   The output from the vxdisk list command displays the multi-pathing information, as shown in the following example:

   Device:    c1t0d3
   devicetag: c1t0d3
   type:      simple
   hostid:    system01
   .
   .
   .
   Multipathing information:
   numpaths:   2
   c1t0d3 state=enabled   type=secondary
   c4t1d3 state=disabled  type=primary

   The numpaths line shows that there are 2 paths to the device. The next two lines in the "Multipathing information" section show that one path is active (state=enabled) and that the other path has failed (state=disabled).

   The type field is shown for disks on Active/Passive type disk arrays such as the EMC CLARiiON, Hitachi HDS 9200 and 9500, Sun StorEdge 6xxx, and Sun StorEdge T3 array. This field indicates the primary and secondary paths to the disk.

   The type field is not displayed for disks on Active/Active type disk arrays such as the EMC Symmetrix, Hitachi HDS 99xx and Sun StorEdge 99xx Series, and IBM ESS Series. Such arrays have no concept of primary and secondary paths.

2. Alternately, you can use the following command to view multi-pathing information:

   # vxdmpadm getsubpaths dmpnodename=devicename

   For example, to view multi-pathing information for emc_clariion0_17, use the following command:

   # vxdmpadm getsubpaths dmpnodename=emc_clariion0_17

   Typical output from the vxdmpadm getsubpaths command is as follows:

   NAME   STATE[A]   PATH-TYPE[M] CTLR-NAME ENCLR-TYPE    ENCLR-NAME        ATTRS
   ===============================================================================
   c0t5d7 ENABLED(A) PRIMARY      c0        EMC_CLARiiON  emc_clariion0     -    
   c0t5d7 ENABLED(A) PRIMARY      c0        EMC_CLARiiON  emc_clariion0     -
   c0t5d7 ENABLED    SECONDARY    c0        EMC_CLARiiON  emc_clariion0     --
   c0t5d7 ENABLED    SECONDARY    c0        EMC_CLARiiON  emc_clariion0     -