Dell PowerVault MD3200 Owner's Manual - Page 173

CAUTION: Certain commands, such as lsscsi, displays one or more instances of Universal Xport devices. These device nodes must never be accessed, mounted, or used in any way. Doing so could cause loss of communication to the storage array and possibly cause serious damage to the storage array, potential making data stored on the array inaccessible. Only multipathing device nodes and partition nodes created using the directions provided above should be mounted or in any way accessed by the host system or its users. Table 13-1. Device Mapper Commands Command multipath -h multipath -ll multipath multipath -f multipath -F rescan_dm_devs Descriptions Prints usage information Displays the current multipath topology using all available information (sysfs, the device mapper, path checkers, and so on) Re-aggregates multipathing device with simplified output. Flushes out Device Mapper for the specified multipathing device. Used if the underlying physical devices are deleted/unmapped. Flushes out all unused multipathing device maps. Dell provided script. Forces a rescan of the host's SCSI bus and aggregates multipathing devices as needed. For use when: • LUNs are dynamically mapped to the hosts. • New targets are added to the host. • Failback of the storage array is required. Configuration: Device Mapper Multipath for Linux 173