1. yum -y install device-mapper device-mapper-multipath
    3. modprobe dm-multipath
    5. systemctl enable multipathd

    查看已经存在的磁盘wwid

    1. yum -y install iscsi*
    2. [ root@cache.node05.zjcdn.com ~ ]$lsscsi -i
    3. [0:2:0:0]    disk    DELL     PERC H330 Mini   4.25  /dev/sda   361866da04ce656001fb374d903e57dd3
    4. [0:2:1:0]    disk    DELL     PERC H330 Mini   4.25  /dev/sdb   361866da04ce65600247e69bd088a00ed
    5. [0:2:2:0]    disk    DELL     PERC H330 Mini   4.25  /dev/sdc   361866da04ce65600247e69c70927d8f8
    6. [0:2:3:0]    disk    DELL     PERC H330 Mini   4.25  /dev/sdd   361866da04ce65600247e69cf09a0e817
    7. [0:2:4:0]    disk    DELL     PERC H330 Mini   4.25  /dev/sde   361866da04ce65600247e69d70a17ca53
    8. [10:0:0:0]   cd/dvd  PLDS     DVD+-RW DU-8A5LH DD51  /dev/sr0   -
    9. [11:0:0:0]   disk    DellEMC  ME4              G280  /dev/sdf   -
    10. [11:0:0:1]   disk    DellEMC  ME4              G280  /dev/sdg   3600c0ff0005341c819631a6001000000
    11. [11:0:0:2]   disk    DellEMC  ME4              G280  /dev/sdh   3600c0ff0005341c816631a6001000000
    12. [11:0:0:3]   disk    DellEMC  ME4              G280  /dev/sdi   3600c0ff0005341c813631a6001000000
    13. [11:0:0:4]   disk    DellEMC  ME4              G280  /dev/sdj   3600c0ff0005341c811631a6001000000
    14. [11:0:0:5]   disk    DellEMC  ME4              G280  /dev/sdk   -
    15. [12:0:0:0]   disk    DellEMC  ME4              G280  /dev/sdl   3600c0ff0005341c8bca9406001000000
    16. [12:0:0:1]   disk    DellEMC  ME4              G280  /dev/sdm   3600c0ff0005341c819631a6001000000
    17. [12:0:0:2]   disk    DellEMC  ME4              G280  /dev/sdn   3600c0ff0005341c816631a6001000000
    18. [12:0:0:3]   disk    DellEMC  ME4              G280  /dev/sdo   3600c0ff0005341c813631a6001000000
    19. [12:0:0:4]   disk    DellEMC  ME4              G280  /dev/sdp   3600c0ff0005341c811631a6001000000
    20. [12:0:0:5]   disk    DellEMC  ME4              G280  /dev/sdq   3600c0ff0005341c8d9b1406001000000

    在存储上创建卷并映射，映射完成后重启服务器，重启完成后再查看磁盘的wwid，此时多出来的wwid就是新建卷的wwid，将wwid添加到/etc/multipath.conf，然后重启服务即可

    1. [ root@cache.node05.zjcdn.com ~ ]$cat /etc/multipath.conf
    2. blacklist {
    3.     wwid "*"
    4. }
    5. blacklist_exceptions{
    6.   wwid "3600c0ff0005341c811631a6001000000"
    7.   wwid "3600c0ff0005341c813631a6001000000"
    8.   wwid "3600c0ff0005341c816631a6001000000"
    9.   wwid "3600c0ff0005341c819631a6001000000"
    10.   wwid "3600c0ff0005341c8bca9406001000000"
    11.   wwid "3600c0ff0005341c8d9b1406001000000"
    12. }
    13. defaults {
    14.     user_friendly_names yesa
    15.     find_multipaths yes
    16.     path_grouping_policy multibus
    17.     failback immediate
    18.     no_path_retry fail
    19. }
    21. multipaths{
    22.  multipath{
    23.     wwid 3600c0ff0005341c811631a6001000000
    24.     alias dm01
    25. }
    26.  multipath{
    27.     wwid 3600c0ff0005341c813631a6001000000
    28.     alias dm02
    29. }
    30. multipath{
    31.     wwid 3600c0ff0005341c816631a6001000000
    32.     alias dm03
    33. }
    34. multipath{
    35.     wwid 3600c0ff0005341c819631a6001000000
    36.     alias dm04
    37. }
    39. multipath{
    40.     wwid 3600c0ff0005341c8bca9406001000000
    41.     alias dm05
    42. }
    44. multipath{
    45.     wwid 3600c0ff0005341c8d9b1406001000000
    46.     alias dm06
    47. }

    Centos7.2 HBA卡驱动链接：http://filedownloads.cavium.com/Files/TempDownlods/97850/kmod-qlgc-qla2xxx-8.08.00.08.07.5_k19-1.rhel7u5.x86_64.rpm

    1. modprobe bridge
    2. modprobe -v qla2xxx
    3. /bin/sleep 30
    4. systemctl start multipathd.service
    7. /bin/sleep 10
    8. mount UUID=429716fe-c2ae-4c6a-9d8d-1d8a10f3126f /mnt
    10. /bin/sleep 2
    11. mount UUID=86815f1d-a6e3-4bc2-bf05-2d95a325add0 /mnt/dongao_cloud/2b4f
    1. modprobe dm-multipath 
    2. systemctl restart multipathd
    1. /bin/sleep 3
    2. mount UUID=6f547694-11ac-4d02-85a8-b1879dbc1a42 /shanghai_cloud
    4. /bin/sleep 2
    5. mount UUID=8dbe8469-9911-448e-b2a2-963f7e2177a7 /beijing_cloud
    8. /bin/sleep 2
    9. mount UUID=894dae77-879e-455b-9846-a506a7c9436c /beijing_cloud/beijing1
    11. /bin/sleep 2
    12. mount UUID=667bfeac-9930-4ad6-9308-48236f72b649 /beijing_cloud/beijing2

    自动生成multipathd配置文件

    1. 使用 mpathconf 命令创建配置文件并启用多路径。若无需编辑该配置文件,可使用此命令启动多路径守护程序
    2.     mpathconf --enable
    3.     mpathconf --with_module y
    4.     mpathconf --with_multipathd y