Multipath.conf configuration max

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Operating Systems Linux Red Hat Multipath.conf configuration max_fds Post 302604832 by Tommyk on Tuesday 6th of March 2012 05:29:05 AM

03-06-2012

Registered User

Multipath.conf configuration max_fds

Hi all,

I am looking at the specific configuration settings for multipath.conf on RHEL5.5.

In particular i was looking at the max_fds setting. Can anyone tell me the max number of open file descriptors that the RHEL5.5 system can have?

It has been set previously to 8192, and i was wondering if this value is correct. should it be higher or lower and what are the implications of setting this value either higher or lower?

my current defaults are as below:

Code:

defaults {
        udev_dir                /dev
        polling_interval        10
        selector                "round-robin 0"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        prio_callout            /bin/true
        path_checker            readsector0
        rr_min_io               100
        max_fds                 8192
        rr_weight               priorities
        failback                0
        features                "fail_if_no_path"
        no_path_retry           5
}

and my devices specific settings are as follows:

Code:

devices {
        device {
        vendor                  "(HITACHI|HP)"
        product                 "OPEN-.*"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        path_checker            hp-sw
        path_selector           "round-robin 0"
        hardware_handler        "0"
        failback                0
        rr_weight               priorities
        no_path_retry           queue
}

If anyone has a good amount of experience on this and can provide any insight into any issues with this i would be grateful to hear it. The SAN disk it is attached to is an HP24000 disk array.

Cheers,
Tom

Tommyk

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LEARN ABOUT OPENSOLARIS

mp_getmplogicalunitproperties

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

NAME

       MP_GetMPLogicalUnitProperties - get logical unit properties

SYNOPSIS

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

       MP_STATUS MP_GetMPLogicalUnitProperties(MP_OID oid,
	    MP_MULTIPATH_LOGICAL_UNIT_PROPERTIES *pProps);

PARAMETERS

       oid	 The object ID of the multipath logical unit.

       pProps	 A pointer to an object ID that has type MP_MULTIPATH_LOGICAL_UNIT_PROPERTIES structure allocated by the caller. With a successful
		 return, this structure contains the properties of the multipath logical unit specified by the object ID.

DESCRIPTION

       The MP_GetMPLogicalUnitProperties() function gets the properties of the specified logical unit.

RETURN VALUES

       MP_STATUS_INVALID_PARAMETER

	   The pProps 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_MULTIPATH_LU.

       MP_STATUS_INVALID_OBJECT_TYPE

	   The oid does not specify any valid object type. This is most likely to happen if an uninitialized oid is passed to the API.

       MP_STATUS_OBJECT_NOT_FOUND

	   The oid owner ID or object sequence number  is invalid.

       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_GetMPLuOidListFromTPG(3MPAPI), MP_GetMultipathLus(3MPAPI), attributes(5)

       Multipath Management API Version 1.0

SunOS 5.11							    15 Feb 2006 			     MP_GetMPLogicalUnitProperties(3MPAPI)