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Displaying the paths to a disk

The vxdisk command is used to display the multipathing information for a particular metadevice. The metadevice is a device representation of a particular physical disk having multiple physical paths from one of the system's HBA controllers. In VxVM, all the physical disks in the system are represented as metadevices with one or more physical paths.

You can 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

sda sda mydg01 mydg ENABLED

sdi sdi mydg01 mydg ENABLED

sdb sdb mydg02 mydg ENABLED

sdj sdj 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 multipathing information for a particular metadevice, use the following command:

# vxdisk list devicename

For example, to view multipathing information for the device sdl, use the following command:

# vxdisk list sdl

Typical output from the vxdisk list command is as follows:

Device:    sdl

devicetag: sdl

type: sliced

hostid: zort

disk: name=mydg04 id=962923652.362193.zort

group: name=mydg id=962212937.1025.zort

flags: online ready private autoconfig autoimport imported

pubpaths: block=/dev/vx/dmp/sdl3 char=/dev/vx/rdmp/sdl3

privpaths: block=/dev/vx/dmp/sdl5 char=/dev/vx/rdmp/sdl5

version: 2.2

iosize: min=512 (bytes) max=16 (blocks)

public: slice=3 offset=0 len=16450497

private: slice=5 offset=1 len=2049

update: time=962923719 seqno=0.7

headers: 0 248

configs: count=1 len=1488

logs: count=1 len=225

Defined regions:

config priv 000017-000247[000231]: copy=01 offset=000000 enabled

config priv 000249-001505[001257]: copy=01 offset=000231 enabled

log priv 000745-000854[000110]: copy=01 offset=000000 enabled

Multipathing information:

numpaths: 2

sdl state=enabled type=secondary

sdp state=disabled type=primary

In the Multipathing information section of this output, the numpaths line shows that there are 2 paths to the device, and the following two lines show that the path to sdl is active (state=enabled) and that the other path sdp 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.