## This is the /etc/multipath.conf file recommended for
## EMC storage devices.
##
## OS : RHEL 4 U3
## Arrays : CLARiiON and Symmetrix
##
## The blacklist is the enumeration of all devices that are to be
## excluded from multipath control
devnode_blacklist
{
        ## Replace the wwid with the output of the command
        ## 'scsi_id -g -u -s /block/[internal scsi disk name]'
        ## Enumerate the wwid for all internal scsi disks.
        ## Optionally, the wwid of VCM database may also be listed here.
        ## 3-4 Native Multipath Failover, DM-MPIO for v2.6.x Linux Kernel
        ## and EMC Storage Arrays Configuration Guide
        ## Native Multipath Failover on RHEL 4
        ##wwid 35005076718 d4224d
        ##or just do this:
        devnode "^sda"
        devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
        devnode "^hd[a-z][0-9]*"
        devnode "^cciss!c[0-9]d[0-9]*[p[0-9]*]"
}
## Use user friendly names, instead of using WWIDs as names.
defaults {
        ## Use user friendly names, instead of using WWIDs as names.
        user_friendly_names yes
}
devices {
        ## Device attributes requirements for EMC Symmetrix
        ## are part of the default definitions and do not require separate
        ## definition.
        ## Device attributes for EMC CLARiiON
        device {
                vendor "DGC "
                product "*"
                path_grouping_policy group_by_prio
                getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
                prio_callout "/sbin/mpath_prio_emc /dev/%n"
                path_checker emc_clariion
                path_selector "round-robin 0"
                features "1 queue_if_no_path"
                no_path_retry 300
                hardware_handler "1 emc"
                failback immediate
        }
}