Red Hat ENTERPRISE LINUX 4 - DM MULTIPATH Manual

Also see for ENTERPRISE LINUX 4 - DEVELOPER TOOLS GUIDE: Installation guide Installation guide Tuning guide Installation guide Manual

Determining Device Mapper Entries with the dmsetup Command23Option Description-f device Remove the named multipath device.-F Remove all multipath devices.Table 5.1. Useful multipath Command Options5.4. Determining Device Mapper Entries with the dmsetupCommandYou can use the dmsetup command to find out which device mapper entries match the multipatheddevices.The following command displays all the device mapper devices and their major and minor numbers.The minor numbers determine the name of the dm device. For example, a minor number of 3corresponds to the multipathed device /dev/dm-3.# dmsetup lsmpath2 (253, 4)mpath4p1 (253, 12)mpath5p1 (253, 11)mpath1 (253, 3)mpath6p1 (253, 14)mpath7p1 (253, 13)mpath0 (253, 2)mpath7 (253, 9)mpath6 (253, 8)VolGroup00-LogVol01 (253, 1)mpath5 (253, 7)VolGroup00-LogVol00 (253, 0)mpath4 (253, 6)mpath1p1 (253, 10)mpath3 (253, 5)5.5. Troubleshooting with the multipathd InteractiveConsoleThe multipathd -k command is an interactive interface to the multipathd daemon. Enteringthis command brings up an interactive multipath console. After entering this command, you can enterhelp to get a list of available commands, you can enter a interactive command, or you can enterCTRL-D to quit.The multipathd interactive console can be used to troubleshoot problems you may be having withyour system. For example, the following command sequence displays the multipath configuration,including the defaults, before exiting the console.# multipathd -k> > show config