重新启动AWS后，我已经丢失了RAID（ mdadm ），而磁盘似乎没有问题（单独）。
mdadm不能正常工作 机器重新启动（在Amazon AWS上停止并启动）后，设备/ dev / md0不工作：
[11:52:17 root :) ]$ cat /proc/mdstat Personalities : unused devices: <none> [12:03:09 root :) ]$ mdadm -A /dev/md0 mdadm: no devices found for /dev/md0
但是所有的raid磁盘似乎都是RAID的一部分：
[12:05:24 root :) ]$ mdadm -Q /dev/sdk /dev/sdk: is not an md array /dev/sdk: device 7 in 8 device undetected raid0 /dev/md0. Use mdadm --examine for more detail.
和：
[11:51:40 root :) ]$ mdadm -mdadm --create /dev/md0 --level=0 --raid-devices=8 --chunk=1024 /dev/sd[defghijk] mdadm: /dev/sdd appears to be part of a raid array: level=raid0 devices=8 ctime=Wed Oct 27 10:38:53 2010 mdadm: /dev/sde appears to be part of a raid array: level=raid0 devices=8 ctime=Wed Oct 27 10:38:53 2010 mdadm: /dev/sdf appears to be part of a raid array: level=raid0 devices=8 ctime=Wed Oct 27 10:38:53 2010 mdadm: /dev/sdg appears to be part of a raid array: level=raid0 devices=8 ctime=Wed Oct 27 10:38:53 2010 mdadm: /dev/sdh appears to be part of a raid array: level=raid0 devices=8 ctime=Wed Oct 27 10:38:53 2010 mdadm: /dev/sdi appears to be part of a raid array: level=raid0 devices=8 ctime=Wed Oct 27 10:38:53 2010 mdadm: /dev/sdj appears to be part of a raid array: level=raid0 devices=8 ctime=Wed Oct 27 10:38:53 2010 mdadm: /dev/sdk appears to be part of a raid array: level=raid0 devices=8 ctime=Wed Oct 27 10:38:53 2010
mdadm.conf （供参考） [11:53:10 root ]$ cat /etc/mdadm/mdadm.conf # mdadm.conf # # Please refer to mdadm.conf(5) for information about this file. # # by default, scan all partitions (/proc/partitions) for MD superblocks. # alternatively, specify devices to scan, using wildcards if desired. DEVICE partitions # auto-create devices with Debian standard permissions CREATE owner=root group=disk mode=0660 auto=yes # automatically tag new arrays as belonging to the local system HOMEHOST <system> # instruct the monitoring daemon where to send mail alerts MAILADDR root # definitions of existing MD arrays ARRAY /dev/md0 level=raid0 num-devices=8 UUID=a6c665f4:650c70af:7c32f52b:1d49233e
好的，我办公室里的一些热心者竟然欺骗了我。
开始：
由于configuration错误导致的问题：
文件/etc/mdadm/mdadm.conf指出设备的UUID：
ARRAY /dev/md0 level=raid0 num-devices=8 UUID=a6c665f4:650c70af:7c32f52b:1d49233e
我检查了设备的实际UUID（这是不同的）：
[12:15:30 root :) ]$ vol_id /dev/sde | grep ID_FS_UUID= ID_FS_UUID=575fee91:786ac78e:8ffa4ee6:5eade1eb [12:17:11 root :) ]$ vol_id /dev/sdf | grep ID_FS_UUID= ID_FS_UUID=575fee91:786ac78e:8ffa4ee6:5eade1eb
更改configuration文件后，应该以重新创build模式运行mdadm：
[12:13:01 root :) ]$ mdadm -A /dev/md0 mdadm: /dev/md0 has been started with 8 drives.