 | ||
| Displaying the paths to a disk | ||
|---|---|---|
| Prev | Administering Dynamic Multipathing | Next |
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.
To display the multipathing 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 multipathing information for a particular metadevice
# vxdisk list devicename
For example, to view multipathing information for c1t0d3, use the following command:
# vxdisk list c1t0d3
Typical output from the vxdisk list command is as follows:
Device: c1t0d3 devicetag: c1t0d3 type: simple hostid: zort disk: name=mydg04 id=962923652.362193.zort timeout: 30 group: name=mydg id=962212937.1025.zort info: privoffset=128 flags: online ready private autoconfig autoimport imported pubpaths: block=/dev/vx/dmp/c1t0d3 privpaths: char=/dev/vx/rdmp/c1t0d3 version: 2.1 iosize: min=1024 (bytes) max=64 (blocks) public: slice=0 offset=1152 len=4101723 private: slice=0 offset=128 len=1024 update: time=962923719 seqno=0.7 headers: 0 248 configs: count=1 len=727 logs: count=1 len=110 Defined regions: config priv 000017-000247[000231]:copy=01 offset=000000 disabled config priv 000249-000744[000496]:copy=01 offset=000231 disabled log priv 000745-000854[000110]:copy=01 offset=000000 disabled lockrgn priv 000855-000919[000065]: part=00 offset=000000 Multipathing information: numpaths: 2 c1t0d3 state=enabled type=secondary c4t1d3 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 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.