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Full Discussion: Multipath configuration not being detected
Operating Systems Linux Red Hat Multipath configuration not being detected Post 303032172 by anaigini45 on Wednesday 13th of March 2019 05:00:57 AM
Old 03-13-2019
Multipath configuration not being detected
Hi,

In a RHEL 5 box, I have just added new multipath configurations in /etc/multipath.conf :

Code:
blacklist_exceptions {
        wwid "360002ac0000000000000008e0001ee00"
        wwid "360002ac0000000000000008f0001ee00"
        wwid "360002ac000000000000000900001ee00"
        wwid "360002ac000000000000000910001ee00"
        wwid "360002ac000000000000000920001ee00"
        wwid "360002ac000000000000000930001ee00"
}

These were the steps I used prior to adding the entries above :

1) Scan for available hosts in system :

Code:
[root@csixdb1 ~]# ls /sys/class/fc_host
host3  host4
[root@csixdb1 ~]#

2) Run the following commands to scan the LUN

Code:
$ echo "- - -" > /sys/class/scsi_host/host3/scan

$ echo "- - -" > /sys/class/scsi_host/host4/scan

However, even after the service is started, I am not getting any output from the commands multipath, multipath -v2 nor multipath -ll.

Code:
root@csixdb1 ~]# /etc/init.d/multipathd status
multipathd (pid  29995) is running...
[root@csixdb1 ~]#

Code:
[root@csixdb1 ~]# multipath
[root@csixdb1 ~]#

Code:
[root@csixdb1 ~]# multipath -v2
[root@csixdb1 ~]#

Code:
[root@csixdb1 ~]# multipath -ll
[root@csixdb1 ~]#

Why is this? And how do I proceed from here?
 

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LEARN ABOUT OPENSOLARIS

mp_getmpluoidlistfromtpg

MP_GetMPLuOidListFromTPG(3MPAPI)		   Common Multipath Management Library Functions		  MP_GetMPLuOidListFromTPG(3MPAPI)

NAME

       MP_GetMPLuOidListFromTPG - return a list of object IDs

SYNOPSIS

       cc [ flag... ] file... -lMPAPI [ library... ]
       #include <mpapi.h>

       MP_STATUS MP_GetMPLuOidListFromTPG(MP_OID oid,
	    MP_OID_LIST **ppList);

PARAMETERS

       oid	 The object ID of the target port group.

       ppList	 A  pointer to a pointer to an object ID that has type MP_OID_LIST structure. With a successful return, this contains a pointer to
		 an object ID that has type MP_OID_LIST that contains the object IDs of all the (multipath)  logical  units  associated  with  the
		 specified target port group.

DESCRIPTION

       The  MP_GetMPLuOidListFromTPG() function returns the list of object IDs for the multipath logical units associated with the specific target
       port group.

       When the caller is finished using the list, it must free the memory used by the list by calling MP_FreeOidList.

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 pplist is null or specifies a memory area to which data cannot be written,  or  when  the  oid  has  a  type  subfield  other  than
	   MP_OBJECT_TYPE_TARGET_PORT.

       MP_STATUS_OBJECT_NOT_FOUND

	   The oid owner ID or object sequence number is invalid.

       MP_STATUS_SUCCESS

	   The operation is successful.

       MP_STATUS_FAILED

	   The multipath logical unit list for the specified target port group object ID is not found.

       MP_STATUS_INSUFFICIENT_MEMORY

	   A memory allocation failure occurred.

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_GetMPLogicalUnitProperties(3MPAPI), attributes(5)

       Multipath Management API Version 1.0

SunOS 5.11							    15 Feb 2006 				  MP_GetMPLuOidListFromTPG(3MPAPI)
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