Dell MD3620I, MD3600I owner manual Important Information About Special Partitions, 192

3Flush the Device Mapper multipath maps list to remove any old or modified mappings:

# multipath –F

NOTE: The boot operating system drive may have an entry with the Device Mapper multipathing table. This is not affected by the multipath –Fcommand. However, using #multipath –llshould not show any multipathing devices with model “MD3600i” or “MD3600i”.

4Log out of all iSCSI sessions from the host server to the storage array:

# iscsiadm –m node --logout

Important Information About Special Partitions

When using Device Mapper with the MD3600i Series array, all physical disks are assigned a disk device node. This includes a special device type used for in-band management of the MD3600i Series array, known as the Access Disk or Universal Xport device.

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 14-1. Useful Device Mapper Commands

Command	Description
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	Flushes out Device Mapper for the specified multipathing
<multipath_dev_node>	device. Used if the underlying physical devices are
	deleted/unmapped.
multipath –F	Flushes out all unused multipathing device maps.

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Configuration: Device Mapper Multipath for Linux