如何在Ubuntu上卸载SAN设备-多路径

Question

我不得不通过FibreChannel断开SAN与Ubuntu的连接。我该怎么做？

root@fs2:/# umount /srv/media
umount: /srv/media: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
root@fs2:/# fuser /srv/media
root@fs2:/# fuser /dev/mapper/media

多路径输出：

root@fs2:/# multipath -v2 -l
media (360060160c8101f00d25370be50a6df11) dm-0 DGC     ,RAID 5        
[size=2.8T][features=1 queue_if_no_path][hwhandler=1 emc]
\_ round-robin 0 [prio=0][active]
 \_ 3:0:0:0 sda 8:0   [active][undef]
\_ round-robin 0 [prio=0][enabled]
 \_ 2:0:0:0 sdb 8:16  [active][undef]

多路径配置：

root@fs2:/# cat /etc/multipath.conf 
multipaths {
  multipath {
    wwid                    360060160c8101f00c0f618c25c9edf11
    alias                   web
    path_grouping_policy    multibus
    path_checker            directio
    path_selector           "round-robin 0"
    failback                manual
    rr_weight               priorities
    no_path_retry           5
    rr_min_io               100
  }

  multipath {
    wwid                    360060160c8101f00d25370be50a6df11
    alias                   media
    path_grouping_policy    multibus
    path_checker            directio
    path_selector           "round-robin 0"
    failback                manual
    rr_weight               priorities
    no_path_retry           5
    rr_min_io               100
  }
}

如何禁用此设备并将其永久从系统卸载？

Answer 1

我发现设备正在/etc/exports中用于与nfs客户端共享。运行exportfs -rv之后，从smbd.conf (重新启动桑巴)中移除设备，从/etc/fstab中移除设备，我就能够卸载设备umount /srv/media。

我也做过：

root@fs2:/# multipath -ll
media (360060160c8101f00d25370be50a6df11) dm-0 DGC     ,RAID 5        
[size=2.8T][features=1 queue_if_no_path][hwhandler=1 emc]
\_ round-robin 0 [prio=1][active]
 \_ 3:0:0:0 sda 8:0   [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 2:0:0:0 sdb 8:16  [active][ready]
root@fs2:/# multipath -F
root@fs2:/# multipath -ll

最后(其中sda和sdb是从多路径获取的)：

root@fs2:/# echo 1 > /sys/block/sda/device/delete
root@fs2:/# echo 1 > /sys/block/sdb/device/delete

它在dmesg中带来了这些消息：

[9847487.812391] sd 3:0:0:0: emc: Detached
[9847491.460307] sd 2:0:0:0: emc: Detached

似乎终于卸下了装置。希望有人发现这个有用：)