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Full Discussion: Info on /dev/dm files
Operating Systems Linux Red Hat Info on /dev/dm files Post 302664571 by Peasant on Friday 29th of June 2012 11:45:51 PM
Old 06-30-2012
Folks, according to DM Multipath - DM Multipath Configuration and Administration https://docs.google.com/viewer?url=h...path-en-US.pdf, page 17

"Any devices of form /dev/dm-n are for internal use only and should never be used"

The manual suggest using /dev/mapper devices in LVM/Multipath setup on RHEL6

Regards
Peasant.
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MP_EnablePath(3MPAPI)				   Common Multipath Management Library Functions			     MP_EnablePath(3MPAPI)

NAME
MP_EnablePath - enable a path SYNOPSIS
cc [ flag... ] file... -lMPAPI [ library... ] #include <mpapi.h> MP_STATUS MP_EnablePath(MP_OID oid); PARAMETERS
oid The object ID of the path. DESCRIPTION
The MP_EnablePath() function enables a path. This API might cause failover in a logical unit with asymmetric access. This API sets the field disabled of structure MP_PATH_LOGICAL_UNIT_PROPERTIES to false. RETURN VALUES
MP_STATUS_INVALID_OBJECT_TYPE The oid does not specify any valid object type. This is most likely to happen if an uninitialized object ID is passed to the API. MP_STATUS_INVALID_PARAMETER The oid has a type subfield other than MP_OBJECT_TYPE_PATH_LU. MP_STATUS_OBJECT_NOT_FOUND The oid owner ID or object sequence number is invalid. MP_STATUS_UNSUPPORTED The API is not supported. MP_STATUS_TRY_AGAIN The path cannot be enabled at this time. MP_STATUS_SUCCESS The operation is successful. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard: ANSI INCITS 412 | | |Multipath Management API | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
libMPAPI(3LIB), MP_DisablePath(3MPAPI), attributes(5) Multipath Management API Version 1.0 SunOS 5.11 15 Feb 2006 MP_EnablePath(3MPAPI)
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