raid 0磁盘阵列

raid0

1  先给sdb磁盘和sdc磁盘分区

[root@localhost ~]# fdisk /dev/sdb   

Command (m for help): n

Command action
   e   extended
   p   primary partition (1-4)
p

Partition number (1-4): 1

First cylinder (1-26108, default 1): 

Last cylinder, +cylinders or +size{K,M,G} (1-26108, default 26108): +2G

Command (m for help): t
Selected partition 1

Hex code (type L to list codes): L

Hex code (type L to list codes): fd

磁盘  sdc的按如上步骤分区。

        2  同步磁盘

[root@localhost ~]# partx -a /dev/sdb

[root@localhost ~]# partx -a /dev/sdc

3  新建raid

[root@localhost ~]# mdadm -C /dev/md0 -a yes -l 0 -n 2 /dev/sd{b,c}1

4   格式化

[root@localhost ~]# mkfs.ext4 /dev/md0 

5  挂载 /dev/md0

[root@localhost ~]# mount /dev/md0 /mnt/raid0

6   更新 /etc/fstab

#
# /etc/fstab
# Created by anaconda on Tue Apr 25 15:26:09 2017
#
# Accessible filesystems, by reference, are maintained under ‘/dev/disk’
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=9341e6da-5470-4df8-89c5-bfbc3a689d8d /                       ext4    defaults        1 1
UUID=12c88f0f-aa56-4be1-9c87-eaf0cf524e75 /app                    ext4    defaults        1 2
UUID=20192758-4252-4bf6-83d4-52da93ffdab4 /boot                   ext4    defaults        1 2
UUID=567c9b8b-5207-4a4c-8548-9f5b6ee49c3a /home                   ext4    defaults        1 2
UUID=3ac9cd7c-8d23-43a6-a550-9f93df25f5cf swap                    swap    defaults        0 0
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
UUID=”f8326b71-00b6-4f6b-92e1-5d5a852538ae”   /mnt/raid0  ext4 defaults 0 0

7 测试读写速度

读取速度测试

[root@localhost ~]# dd if=/dev/md0 of=file bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 37.2231 s, 28.8 MB/s

写速度测试

[root@localhost ~]# dd if=file of=/dev/md0 bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 47.4734 s, 22.6 MB/s