Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

7Contents
Taking a disk offline ...............................................................................................117
Renaming a disk ......................................................................................................118
Reserving disks .......................................................................................................119
Displaying disk information ...................................................................................119
Displaying disk information with vxdiskadm .................................................120
Chapter 3 Administering dynamic multipathing (DMP)
How DMP works ....................................................................................................121
How DMP monitors I/O on paths ...................................................................124
Load balancing ................................................................................................125
DMP in a clustered environment ....................................................................126
Disabling and enabling multipathing for specific devices ......................................127
Disabling multipathing and making devices invisible to VxVM ...................127
Enabling multipathing and making devices visible to VxVM ........................128
Enabling and disabling I/O for controllers and storage processors ........................130
Displaying DMP database information ...................................................................131
Displaying the paths to a disk .................................................................................131
Administering DMP using vxdmpadm ...................................................................133
Retrieving information about a DMP node ....................................................133
Displaying the members of a LUN group .......................................................134
Displaying paths controlled by a DMP node, controller or array port ...........134
Displaying information about controllers .......................................................135
Displaying information about enclosures .......................................................136
Displaying information about array ports .......................................................136
Displaying information about TPD-controlled devices ..................................137
Gathering and displaying I/O statistics ...........................................................138
Setting the attributes of the paths to an enclosure ..........................................140
Displaying the I/O policy ................................................................................141
Specifying the I/O policy ................................................................................141
Disabling I/O for paths, controllers or array ports ..........................................147
Enabling I/O for paths, controllers or array ports ...........................................148
Upgrading disk controller firmware ...............................................................148
Renaming an enclosure ...................................................................................149
Configuring the response to I/O failures ........................................................149
Configuring the I/O throttling mechanism .....................................................151
Displaying recoveryoption values ..................................................................152
Configuring DMP path restoration policies ....................................................153
Stopping the DMP path restoration thread .....................................................155
Displaying the status of the DMP path restoration thread ..............................155
Displaying information about the DMP error-handling thread ......................155
Configuring array policy modules ..................................................................155
Chapter 4 Creating and administering disk groups