多路径multipath配置文件RedHat7

　　环境描述RedHat Enterprise Linux7 multipath配置文件详解：

vi /etc/multipath.conf

devices {
        device {
                vendor "NETAPP"
                product "LUN.*"
                path_grouping_policy "group_by_prio"
                path_checker "tur"
                features "3 queue_if_no_path pg_init_retries 50"
                hardware_handler "1 alua"
                prio "alua"
                failback "immediate"
                rr_weight "uniform"
                rr_min_io 128
                dev_loss_tmo "infinity"
                retain_attached_hw_handler "yes"
                detect_prio "yes"
                path_selector  "round-robin 0"
                no_path_retry  18
                user_friendly_names yes              
        }
}

blacklist {
    device {
        vendor ".*"
    }
}
blacklist_exceptions {
    device {
        vendor "^NETAPP"
    }
}

查看服务状态
systemctl status multipathd.service
systemctl start multipathd.service
systemctl enable multipathd.service
systemctl list-unit-files | grep multipathd

参考链接：https://access.redhat.com/solutions/1337273

DM-Multipath could not set user friendly names for SAN devices

We have enabled user_friendly_names yes option in /etc/multipath.conf file, but still dm-multipath creates the multipath device maps using WWID instead of user friendly names (e.g. mpathn):

$ less /etc/multipath.conf
[...]
defaults {
    user_friendly_names yes
    find_multipaths yes
}

$ multipath -v2
$ multipath -ll
360a98000572d5765636f65646544784e dm-3 NETAPP  ,LUN             
size=10G features='4 queue_if_no_path pg_init_retries 50 retain_attached_hw_handle' hwhandler='0' wp=rw
`-+- policy='service-time 0' prio=0 status=active
  |- 18:0:0:0 sdc 8:32 active undef running
  `- 19:0:0:0 sdb 8:16 active undef running