1.创建4个硬盘
[root@pc10 ~]# fdisk -l
Disk /dev/vda: 42.9 GB, 42949672960 bytes
16 heads, 63 sectors/track, 83220 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005784f
Device Boot Start End Blocks Id System
/dev/vda1 * 3 1018 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/vda2 1018 83221 41430016 8e Linux LVM
Partition 2 does not end on cylinder boundary.
Disk /dev/vdb: 8589 MB, 8589934592 bytes
16 heads, 63 sectors/track, 16644 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/vdc: 8589 MB, 8589934592 bytes
16 heads, 63 sectors/track, 16644 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/vdd: 8589 MB, 8589934592 bytes
16 heads, 63 sectors/track, 16644 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/vde: 8589 MB, 8589934592 bytes
16 heads, 63 sectors/track, 16644 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/vg_pc6-lv_root: 38.2 GB, 38193332224 bytes
255 heads, 63 sectors/track, 4643 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/mapper/vg_pc6-lv_swap: 4227 MB, 4227858432 bytes
255 heads, 63 sectors/track, 514 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
2。建立raid5卷
[root@pc10 ~]# mdadm --create /dev/md0 --level=5 --raid-devices=4 /dev/vdb /dev/vdc /dev/vdd /dev/vde
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
3.格式化文件系统
[root@pc10 ~]# mkfs.ext4 /dev/md0
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=128 blocks, Stripe width=384 blocks
1572864 inodes, 6288000 blocks
314400 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
192 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information:
done
This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
4.把raid5卷加入启动
[root@pc10 ~]# mdadm --detail --scan >> /etc/mdadm.conf
[root@pc10 ~]# cat /etc/mdadm.conf
ARRAY /dev/md0 metadata=1.2 spares=1 name=pc10:0 UUID=32dfa223:db563b62:8dfbc340:6b7d528d
5.查看raid5信息
[root@pc10 ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 vde[4] vdd[2] vdc[1] vdb[0]
25152000 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [UUU_]
[===========>.........] recovery = 59.0% (4955264/8384000) finish=2.9min speed=19396K/sec
unused devices:
[root@pc10 raid5]# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Fri Jun 13 03:29:55 2014
Raid Level : raid5
Array Size : 25152000 (23.99 GiB 25.76 GB)
Used Dev Size : 8384000 (8.00 GiB 8.59 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Fri Jun 13 03:40:13 2014
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : pc10:0 (local to host pc10)
UUID : 32dfa223:db563b62:8dfbc340:6b7d528d
Events : 22
Number Major Minor RaidDevice State
0 252 16 0 active sync /dev/vdb
1 252 32 1 active sync /dev/vdc
2 252 48 2 active sync /dev/vdd
4 252 64 3 active sync /dev/vde
6.挂载raid5分区
[root@pc10 ~]# mkdir /mnt/raid5
[root@pc10 ~]# mount /dev/md0 /mnt/raid5
[root@pc10 ~]# ll /mnt/raid5/
total 16
drwx------. 2 root root 16384 Jun 13 03:31 lost+found
7.没有做spare
[root@pc10 raid5]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_pc6-lv_root 36G 2.2G 32G 7% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/vda1 485M 32M 428M 7% /boot
/dev/md0 24G 172M 23G 1% /mnt/raid5
8.vim /etc/fstab 加入启动项
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/md0 /mnt/raid5 ext4 defaults 0 0
