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:
SUBPATH DANAME DMNAME GROUP STATE
c1t0d0s2 c1t0d0s2 mydg01 mydg ENABLED
c4t0d0s2 c1t0d0s2 mydg01 mydg ENABLED
c1t1d0s2 c1t1d0s2 mydg02 mydg ENABLED
c4t1d0s2 c1t1d0s2 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:
For example, to view multipathing information for c2t0d0s2
, use the following command:
Typical output from the vxdisk
list
command is as follows:
disk name=mydg01 id=861086917.1052.aparajita
group name=mydg id=861086912.1025.aparajita
flags online ready autoconfig autoimport imported
pubpaths block=/dev/vx/dmp/c2t0d0s4 char=/dev/vx/rdmp/c2t0d0s4
privpaths block=/dev/vx/dmp/c2t0d0s3 char=/dev/vx/rdmp/c2t0d0s3
iosize min=512 (bytes) max=2048 (blocks)
public slice=4 offset=0 len=1043840
private slice=3 offset=1 len=1119
update time=861801175 seqno=0.48
config priv 000017-000247[000231]:copy=01 offset=000000 enabled
config priv 000249-000812[000564]:copy=01 offset=000231 enabled
log priv 000813-000932[000120]:copy=01 offset=000000 enabled
c2t0d0s2 state=enabled type=primary
c1t0d0s2 state=disabled type=secondary
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 c2t0d0s2
is active (state=enabled
) and that the other path c1t0d0s2 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.