VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Chapter 3, Administering Dynamic Multipathing (DMP)
Displaying DMP Database Information
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Displaying DMP Database Information
You can use the vxdmpadm command to list DMP database information and perform
other administrative tasks. This command allows you to list all controllers that are
connected to disks, and other related information that is stored in the DMP database. You
can use this information to locate system hardware, and to help you decide which
controllers need to be enabled or disabled.
The vxdmpadm command also provides useful information such as disk array serial
numbers, whichDMP devices (disks) areconnected to the disk array, andwhich paths are
connected to a particular controller.
For more information, see “Administering DMP Using vxdmpadm” on page 100.
Displaying Multipaths to a VM Disk
The vxdisk command is used to display the multipathing information for a particular
metadevice.The metadeviceisa device representationofa particular physicaldiskhaving
multiple physical paths from the I/O controller of the system. In VxVM, all the physical
disks in the system are represented as metadevices with one or more physical paths.
To view multipathing information for a particular metadevice, use the following
command:
# vxdisk list devicename
For example, to view multipathing information for c1t0d3, use the following command:
# vxdisk list c1t0d3
Typical output is as follows:
Device: c1t0d3
devicetag: c1t0d3
type: simple
hostid: zort
disk: name=disk04 id=962923652.362193.zort
timeout: 30
group: name=rootdg id=962212937.1025.zort
info: privoffset=128
flags: online ready private autoconfig autoimport imported
pubpaths: block=/dev/vx/dmp/
c1t0d3 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
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