Dell POWERVAULT MD3600F User Manual

Page 226

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Configuration: Device Mapper Multipath for Linux

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 must be mounted or in any way accessed by the

host system or its users.

Table 14-1. Device Mapper Commands

Command

Descriptions

multipath -h

Prints usage information.

multipath -ll

Displays the current multipath topology using all

available information (sysfs, the device mapper,

path checkers, and so on).

multipath Re-aggregates

multipathing device with

simplified output.

multipath -f

<multipath_dev_node>

Flushes out Device Mapper for the specified

multipathing device. Used if the underlying

physical devices are deleted/unmapped.

multipath -F

Flushes out all unused multipathing device maps.

rescan_dm_devs

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.

book.book Page 226 Tuesday, June 18, 2013 3:03 PM

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