Linux软RAID下线后恢复

126次阅读

没有评论

共计 5115 个字符，预计需要花费 13 分钟才能阅读完成。

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://www.linuxidc.com/Linux/2012-02/53222.htm

— 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

mount -t ext4 /dev/vgmd2/lvshare /share

7. 最后用 samba 用户名和密码登陆，可以进去，没有提示无权限错误，操作要小心。

最后写入 /etc/fstab

正文完

星哥说事-微信公众号