CentOS6.5软raid0创建

CentOS6.5


1.yum install -y mdadm parted


[root@mytest1 ~]# yum install mdadm parted


================================================================================
 Package        Arch            Version                  Repository        Size
================================================================================
Installing:
 mdadm          x86_64          3.2.6-7.el6_5.2          updates          337 k
 parted           x86_64           2.1-21.el6              base           606 k


Transaction Summary
================================================================================




2.对sdb，sdc两块磁盘分区，设置


[root@mytest1 ~]# fdisk /dev/sdc 


WARNING: DOS-compatible mode is deprecated. It&＃39;s strongly recommended to
         switch off the mode (command &＃39;c&＃39;) and change display units to
         sectors (command &＃39;u&＃39;).


Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1305, default 1): 
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305): 
Using default value 1305


Command (m for help): t
Selected partition 1
Hex code (type L to list codes): fd
Changed system type of partition 1 to fd (Linux raid autodetect)


Command (m for help): p


Disk /dev/sdc: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 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: 0x000c7662


   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1        1305    10482381   fd  Linux raid autodetect


Command (m for help): w
The partition table has been altered!


Calling ioctl() to re-read partition table.
Syncing disks.


3.分区同步免reboot
[root@mytest1 ~]# partprobe 
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy).  As a result, it may not reflect all of your changes until after reboot.


4.查看两块磁盘状态
[root@mytest1 ~]# fdisk -l /dev/sdb  /dev/sdc


Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 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: 0x0af7aca1


   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        1305    10482381   fd  Linux raid autodetect


Disk /dev/sdc: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 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: 0x000c7662


   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1        1305    10482381   fd  Linux raid autodetect


5.创建raid0
[root@mytest1 ~]# mdadm -C /dev/md0 -ayes -l0 -n2 /dev/sd{b,c}1
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.


6.查看状态
[root@mytest1 ~]# cat /proc/mdstat 
Personalities : [raid0] 
md0 : active raid0 sdc1[1] sdb1[0]
      20964352 blocks super 1.2 512k chunks
      
unused devices:


[root@mytest1 ~]# mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Sun Aug 10 14:15:50 2014
     Raid Level : raid0
     Array Size : 20964352 (19.99 GiB 21.47 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent


    Update Time : Sun Aug 10 14:15:50 2014
          State : clean 
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0


     Chunk Size : 512K


           Name : mytest1:0  (local to host mytest1)
           UUID : c62a98dc:7f802f31:6e4435ae:168a6829
         Events : 0


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


6.创建mdadm配置文件
[root@mytest1 ~]# echo DEVICE /dev/sd{b,c}1 >> /etc/mdadm.conf
[root@mytest1 ~]# mdadm -Ds >> /etc/mdadm.conf 
[root@mytest1 ~]# vi /etc/mdadm.conf 


DEVICE /dev/sdb1 /dev/sdc1
ARRAY /dev/md0 level=raid0 num-devices=2 UUID=c62a98dc:7f802f31:6e4435ae:168a6829


7.创建文件系统
[root@mytest1 ~]# 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=256 blocks
1310720 inodes, 5241088 blocks
262054 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
160 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 37 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.


8.开机自动挂载
[root@mytest1 ~]# mkdir /raid0disk
[root@mytest1 ~]# vi /etc/fstab 
#
# /etc/fstab
# Created by anaconda on Sun Aug 10 02:32:47 2014
#
# Accessible filesystems, by reference, are maintained under &＃39;/dev/disk&＃39;
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/vg_mytest1-root /                       ext4    defaults        1 1
UUID=af6ed5f7-9181-440e-9b49-fff643caba9d /boot                   ext4    defaults        1 2
/dev/mapper/vg_mytest1-tmp /tmp                    ext4    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/dev/md0                /raid0disk              ext4    defaults        0 0
~
~
"/etc/fstab" 16L, 816C written


9.挂载后确认
[root@mytest1 ~]# mount -a
[root@mytest1 ~]# df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/vg_mytest1-root  6.8G  781M  5.7G  12% /
tmpfs                        939M     0  939M   0% /dev/shm
/dev/sda1                     97M   28M   64M  31% /boot
/dev/mapper/vg_mytest1-tmp  1008M   34M  924M   4% /tmp
/dev/md0                      20G  172M   19G   1% /raid0disk