linux软raid下线后恢复

浏览数：33 / 时间：2015年06月20日

机器中有数据的话，操作起来必须要非常小心。内部samba服务器访问不了，到了/share（共享目录）下，什么也没有。数据全部都没看到。后来，仔细查看，发现机器有5块硬盘，好像是做了软raid

1.使用fdisk -l命令查看，发现

/dev/sde1 1 60801 488384001 fd Linux raid autodete

2.cat /proc/mdstat,md0,md1全部都是inactive

3.全部下线，考虑了很久，因为有数据，所以不敢做太多的操作，想重新建立应该是没关系的吧

先关闭raid：mdadm -Ss，然后启动raid：mdadm -As

cat /etc/mdadm.conf

DEVICE /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/md0 /dev/md1
ARRAY /dev/md0 metadata=1.2 name=file:0 UUID=4bd3bbbb:57305692:6d264713:10028518
ARRAY /dev/md1 metadata=1.2 name=file:1 UUID=190d94c6:7d7754a0:f91a4e70:acfdc372
ARRAY /dev/md2 metadata=1.2 name=file:2 UUID=6662ae21:aa253ded:46ea5e25:9a4559a4

4.启动后，fdisk -l

Disk /dev/sdb: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xd87fd87f

Device Boot Start End Blocks Id System
/dev/sdb1 1 38913 312568641 fd Linux raid autodetect

Disk /dev/sdc: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x3a563a56

Device Boot Start End Blocks Id System
/dev/sdc1 1 38913 312568641 fd Linux raid autodetect

Disk /dev/sdd: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x9fd1c6eb

Device Boot Start End Blocks Id System
/dev/sdd1 1 60801 488384001 fd Linux raid autodetect
Partition 1 does not start on physical sector boundary.

Disk /dev/sde: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xe0150a6e

Device Boot Start End Blocks Id System
/dev/sde1 1 60801 488384001 fd Linux raid autodetect
Partition 1 does not start on physical sector boundary.

Disk /dev/md0: 319.9 GB, 319935873024 bytes
2 heads, 4 sectors/track, 78109344 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xddd48bce

Disk /dev/md0 doesn‘t contain a valid partition table

Disk /dev/md1: 500.0 GB, 499970801664 bytes
2 heads, 4 sectors/track, 122063184 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Alignment offset: 512 bytes
Disk identifier: 0x00000000

Disk /dev/md1 doesn‘t contain a valid partition table

Disk /dev/md2: 819.9 GB, 819906215936 bytes
2 heads, 4 sectors/track, 200172416 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Alignment offset: 512 bytes
Disk identifier: 0xe6aa9a8f

Device Boot Start End Blocks Id System
/dev/md2p1 129 200172416 800689152 8e Linux LVM
Partition 1 does not start on physical sector boundary.

5.mdadm --detail /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Tue Mar 26 00:10:39 2013
     Raid Level : raid1
     Array Size : 312437376 (297.96 GiB 319.94 GB)
  Used Dev Size : 312437376 (297.96 GiB 319.94 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Thu Apr  3 22:43:39 2014
          State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
  Spare Devices : 0

           Name : file:0  (local to host file)
           UUID : 4bd3bbbb:57305692:6d264713:10028518
         Events : 16408

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

就是两个磁盘做raid1，然后md0和md1做raid0

6.看了上面的输出，有使用率，说明数据还在，稍微放了一下心

直接mount /dev/md2p1 /share，提示mount: unknown filesystem type ‘LVM2_member‘

解决方法：http://tonychiu.blog.51cto.com/656605/769934

--- Logical volume ---
  LV Name                /dev/vgmd2/lvshare
  VG Name                vgmd2
  LV UUID                hN0kGI-5yBU-3ABH-rkU2-fPGi-JfX8-D1C0DQ
  LV Write Access        read/write
  LV Status              NOT available
  LV Size                256.00 GiB
  Current LE             16384
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto

  --- Logical volume ---
  LV Name                /dev/vgmd2/lvnfs
  VG Name                vgmd2
  LV UUID                PRKkOr-zzJd-O0di-GT8W-0lsf-wtN3-1bFShN
  LV Write Access        read/write
  LV Status              NOT available
  LV Size                10.00 GiB
  Current LE             640
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto

vgchange -ay后，lvdisplay

--- Logical volume ---
  LV Name                /dev/vgmd2/lvshare
  VG Name                vgmd2
  LV UUID                hN0kGI-5yBU-3ABH-rkU2-fPGi-JfX8-D1C0DQ
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                256.00 GiB
  Current LE             16384
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     4096
  Block device           254:4

  --- Logical volume ---
  LV Name                /dev/vgmd2/lvnfs
  VG Name                vgmd2
  LV UUID                PRKkOr-zzJd-O0di-GT8W-0lsf-wtN3-1bFShN
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                10.00 GiB
  Current LE             640
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     4096
  Block device           254:5