ubuntu – 当RAID处于降级模式时如何重新添加驱动器?

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我正在运行一个非托管的ubuntu服务器,由于最近的性能问题,并向提供程序发送了一个请求,只是为了收到以下响应:

“亲爱的客户,

根据要求,我们检查了您的驱动器.两个驱动器都没有任何错误地通过测试,并且在此处不显示任何临界值.我们注意到RAID处于降级状态,因此您需要在此处将驱动器重新添加到阵列:

-----------------%<-----------------
Personalities : [raid1]
md3 : active raid1 sda4[0]
      1839089920 blocks super 1.2 [2/1] [U_]

md2 : active raid1 sda3[0]
      1073610560 blocks super 1.2 [2/1] [U_]

md1 : active raid1 sda2[0]
      523968 blocks super 1.2 [2/1] [U_]

md0 : active raid1 sda1[0]
      16768896 blocks super 1.2 [2/1] [U_]

unused devices: <none>
-----------------%<-----------------"

谷歌表示U_表示驱动器出现故障,这似乎与支持部门的说法相矛盾.我该怎么从这里开始?

就像是

mdadm /dev/mdX -r /dev/sdaY  
mdadm /dev/mdX -a /dev/sdaY

如果是这样,我的情况下X和Y是什么?如果需要有关我的配置的更多信息,请告诉我.

编辑,更多信息如下:

root@Ubuntu-1204-precise-64-minimal /home # df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/md2       1008G   26G  931G   3% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
udev             16G  4.0K   16G   1% /dev
tmpfs           3.2G  504K  3.2G   1% /run
none            5.0M     0  5.0M   0% /run/lock
none             16G     0   16G   0% /run/shm
none            100M     0  100M   0% /run/user
/dev/md1        488M   66M  397M  15% /boot
/dev/md3        1.7T   31G  1.6T   2% /home

root@Ubuntu-1204-precise-64-minimal /home # mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Wed Nov  6 08:02:41 2013
     Raid Level : raid1
     Array Size : 16768896 (15.99 GiB 17.17 GB)
  Used Dev Size : 16768896 (15.99 GiB 17.17 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Wed Dec 21 03:50:13 2016
          State : clean,degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : rescue:0
           UUID : 872ad258:c42ccb36:e9e19c96:98b55ee9
         Events : 816844

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       0        0        1      removed

root@Ubuntu-1204-precise-64-minimal /home # mdadm -D /dev/md1
/dev/md1:
        Version : 1.2
  Creation Time : Wed Nov  6 08:02:41 2013
     Raid Level : raid1
     Array Size : 523968 (511.77 MiB 536.54 MB)
  Used Dev Size : 523968 (511.77 MiB 536.54 MB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Wed Dec 21 07:30:55 2016
          State : clean,degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : rescue:1
           UUID : 18cb39fc:9eaea61c:0074a6c2:661b5862
         Events : 387

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       0        0        1      removed

root@Ubuntu-1204-precise-64-minimal /home # mdadm -D /dev/md2
/dev/md2:
        Version : 1.2
  Creation Time : Wed Nov  6 08:02:42 2013
     Raid Level : raid1
     Array Size : 1073610560 (1023.87 GiB 1099.38 GB)
  Used Dev Size : 1073610560 (1023.87 GiB 1099.38 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Wed Dec 21 07:58:52 2016
          State : active,degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : rescue:2
           UUID : eb9be750:7ff778b4:31fd7ce9:9d86d191
         Events : 38799724

    Number   Major   Minor   RaidDevice State
       0       8        3        0      active sync   /dev/sda3
       1       0        0        1      removed

root@Ubuntu-1204-precise-64-minimal /home # mdadm -D /dev/md3
/dev/md3:
        Version : 1.2
  Creation Time : Wed Nov  6 08:02:42 2013
     Raid Level : raid1
     Array Size : 1839089920 (1753.89 GiB 1883.23 GB)
  Used Dev Size : 1839089920 (1753.89 GiB 1883.23 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Wed Dec 21 07:57:41 2016
          State : clean,degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : rescue:3
           UUID : c9b748ef:332d3bf9:5fa8fef1:5b433b0a
         Events : 7429895

    Number   Major   Minor   RaidDevice State
       0       8        4        0      active sync   /dev/sda4
       1       0        0        1      removed
添加回RAID 1成员

要将RAID成员添加回阵列,请使用:

mdadm <RAID Device> -a <Device to add into the array>

例如:

$mdadm /dev/md0 -a /dev/sdc1
mdadm: re-added /dev/sdc1

如果使用mdadm –detail再次检查,您将看到/ dev / sdc1显示为“rebuilding”:

Number   Major   Minor   RaidDevice State
   0       8       17        0      active sync   /dev/sdb1
   2       8       33        1      spare rebuilding   /dev/sdc1

这意味着新添加的成员正在与另一个成员上的数据同步;如果你现在检查proc / mdstat,你可以看到同步进度 – 百分比和条形图:

$cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md0 : active raid1 sdc1[2] sdb1[0]
      976759936 blocks [2/1] [U_]
      [>....................]  recovery =  1.2% (12409024/976759936) finish=195.2min speed=82312K/sec

unused devices: <none>

确认在添加新RAID成员后仍可以在RAID驱动器上看到您的文件

$ls /mnt/raid1
Music  lost+found  Images Films Misc

资料来源:http://www.linuceum.com/Server/srvRAIDTest.php

原文链接:https://www.f2er.com/ubuntu/347810.html

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