============================== 生产环境 分区做raid
[root@192_168_11_203 tmp]# cat /proc/mdstat 查看做raid情况
Personalities : [raid1]
md0 : active raid1 sdc[1] sdb[0]
998891520 blocks super 1.2 [2/2] [UU]
bitmap: 2/8 pages [8KB], 65536KB chunk
unused devices: <none>
[root@192_168_11_203 ~]# fdisk -l
Disk /dev/sdb: 1023.0 GB, 1022999134208 bytes
Disk /dev/sdc: 1023.0 GB, 1022999134208 bytes
Disk /dev/sdd: 899.0 GB, 898999779328 bytes
Disk /dev/sde: 899.0 GB, 898999779328 bytes
Disk /dev/sda: 299.0 GB, 298999349248 bytes
Disk /dev/md0: 1022.9 GB, 1022864916480 bytes
[root@192_168_11_203 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 30G 4.8G 24G 17% /
tmpfs 64G 4.0K 64G 1% /dev/shm
/dev/sda1 190M 47M 133M 27% /boot
/dev/md0p1 938G 132G 759G 15% /data <--- /dev/md0: 1022.9 GB
/dev/sdd1 824G 73M 783G 1% /backup <--- /dev/sdd: 899.0 GB
/dev/sde1 824G 11G 773G 2% /logs <--- /dev/sde: 899.0 GB
[root@192_168_11_203 ~]# cat /etc/fstab
/dev/md0p1 /data ext4 defaults 0 0
/dev/sdd1 /backup ext4 defaults 0 0
/dev/sde1 /logs ext4 defaults 0 0
###################创建软RAID0
###分区
fdisk /dev/sdb
n/p/1/+50M/w
fdisk /dev/sdc
n/p/1/+50M/w
###安装软raid工具
下载mdadm
http://download.chinaunix.net/down.php?id=28095&ResourceID=6641&site=1
tar jxf mdadm-3.0.tar.bz2
make
make install
###做软raid
mdadm -C --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb2 /dev/sdc2
y
###查看是否有:/dev/md0
fdisk -l
###格式化
mkfs.ext4 /dev/md0
###查看raid信息
mdadm -D /dev/md0
cat /proc/mdstat
###挂载
mkdir /mdata
mount /dev/md0 /mdata
### df -h 查看
/dev/md0 80M 1.6M 74M 3% /mdata
===================== 生成案例
[root@oth-bj-110-110-119-119 /]# fdisk -l
Disk /dev/sda: 300.0 GB, 300000000000 bytes
255 heads, 63 sectors/track, 36472 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: 0xe2b2e2b2
Device Boot Start End Blocks Id System
/dev/sda1 * 1 26 204800 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 26 3942 31457280 83 Linux
/dev/sda3 3942 4465 4194304 82 Linux swap / Solaris
Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 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: 0x00000000
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 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: 0x00000000
Disk /dev/md0: 1000.1 GB, 1000070447104 bytes
2 heads, 4 sectors/track, 244157824 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 524288 bytes
Disk identifier: 0xfa2f1e15
[root@oth-bj-110-110-119-1193 /]# mdadm -C /dev/md0 -c512 -l1 -n2 /dev/sd[b-c] --auto=yes
[root@oth-bj-110-110-119-1193 /]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdc[2] sdb[0]
976631296 blocks super 1.2 level 5, 512k chunk, algorithm 2 [2/1] [U_]
[==============>......] recovery = 74.4% (727073492/976631296) finish=46.4min speed=89539K/sec
bitmap: 0/8 pages [0KB], 65536KB chunk
unused devices: <none>
[root@oth-bj-110-110-119-1193 /]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Fri May 20 16:41:57 2016
Raid Level : raid5
Array Size : 976631296 (931.39 GiB 1000.07 GB)
Used Dev Size : 976631296 (931.39 GiB 1000.07 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Fri May 20 18:49:25 2016
State : clean, degraded, recovering
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Rebuild Status : 81% complete
Name : oth-bj-119-090-062-013:0 (local to host oth-bj-119-090-062-013)
UUID : 5e3e97cc:441c6a7e:5adc8f88:f21ec830
Events : 1553
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
[root@192_168_11_203 tmp]# cat /proc/mdstat 查看做raid情况
Personalities : [raid1]
md0 : active raid1 sdc[1] sdb[0]
998891520 blocks super 1.2 [2/2] [UU]
bitmap: 2/8 pages [8KB], 65536KB chunk
unused devices: <none>
[root@192_168_11_203 ~]# fdisk -l
Disk /dev/sdb: 1023.0 GB, 1022999134208 bytes
Disk /dev/sdc: 1023.0 GB, 1022999134208 bytes
Disk /dev/sdd: 899.0 GB, 898999779328 bytes
Disk /dev/sde: 899.0 GB, 898999779328 bytes
Disk /dev/sda: 299.0 GB, 298999349248 bytes
Disk /dev/md0: 1022.9 GB, 1022864916480 bytes
[root@192_168_11_203 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 30G 4.8G 24G 17% /
tmpfs 64G 4.0K 64G 1% /dev/shm
/dev/sda1 190M 47M 133M 27% /boot
/dev/md0p1 938G 132G 759G 15% /data <--- /dev/md0: 1022.9 GB
/dev/sdd1 824G 73M 783G 1% /backup <--- /dev/sdd: 899.0 GB
/dev/sde1 824G 11G 773G 2% /logs <--- /dev/sde: 899.0 GB
[root@192_168_11_203 ~]# cat /etc/fstab
/dev/md0p1 /data ext4 defaults 0 0
/dev/sdd1 /backup ext4 defaults 0 0
/dev/sde1 /logs ext4 defaults 0 0
###################创建软RAID0
###分区
fdisk /dev/sdb
n/p/1/+50M/w
fdisk /dev/sdc
n/p/1/+50M/w
###安装软raid工具
下载mdadm
http://download.chinaunix.net/down.php?id=28095&ResourceID=6641&site=1
tar jxf mdadm-3.0.tar.bz2
make
make install
###做软raid
mdadm -C --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb2 /dev/sdc2
y
###查看是否有:/dev/md0
fdisk -l
###格式化
mkfs.ext4 /dev/md0
###查看raid信息
mdadm -D /dev/md0
cat /proc/mdstat
###挂载
mkdir /mdata
mount /dev/md0 /mdata
### df -h 查看
/dev/md0 80M 1.6M 74M 3% /mdata
===================== 生成案例
[root@oth-bj-110-110-119-119 /]# fdisk -l
Disk /dev/sda: 300.0 GB, 300000000000 bytes
255 heads, 63 sectors/track, 36472 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: 0xe2b2e2b2
Device Boot Start End Blocks Id System
/dev/sda1 * 1 26 204800 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 26 3942 31457280 83 Linux
/dev/sda3 3942 4465 4194304 82 Linux swap / Solaris
Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 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: 0x00000000
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 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: 0x00000000
Disk /dev/md0: 1000.1 GB, 1000070447104 bytes
2 heads, 4 sectors/track, 244157824 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 524288 bytes
Disk identifier: 0xfa2f1e15
[root@oth-bj-110-110-119-1193 /]# mdadm -C /dev/md0 -c512 -l1 -n2 /dev/sd[b-c] --auto=yes
[root@oth-bj-110-110-119-1193 /]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdc[2] sdb[0]
976631296 blocks super 1.2 level 5, 512k chunk, algorithm 2 [2/1] [U_]
[==============>......] recovery = 74.4% (727073492/976631296) finish=46.4min speed=89539K/sec
bitmap: 0/8 pages [0KB], 65536KB chunk
unused devices: <none>
[root@oth-bj-110-110-119-1193 /]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Fri May 20 16:41:57 2016
Raid Level : raid5
Array Size : 976631296 (931.39 GiB 1000.07 GB)
Used Dev Size : 976631296 (931.39 GiB 1000.07 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Fri May 20 18:49:25 2016
State : clean, degraded, recovering
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Rebuild Status : 81% complete
Name : oth-bj-119-090-062-013:0 (local to host oth-bj-119-090-062-013)
UUID : 5e3e97cc:441c6a7e:5adc8f88:f21ec830
Events : 1553
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
2 8 32 1 spare rebuilding /dev/sdc
本文转自cloves 51CTO博客，原文链接:http://blog.51cto.com/yeqing/1775512
