Linux 磁盘管理--RAID5创建
准备
- mdadm
- 三块新硬盘
安装mdadm
- 尝试使用
yum install -y mdadm进行安装,可能是我源的问题.竟然报错了
[root@localhost dev]# yum install -y madadm
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
epel/x86_64/metalink | 10 kB 00:00:00
* base: mirrors.aliyun.com
* epel: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
base | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/2): epel/x86_64/updateinfo | 1.0 MB 00:00:00
(2/2): epel/x86_64/primary_db | 6.8 MB 00:00:03
No package madadm available.
Error: Nothing to do
- 所以只能本地使用
rpm包进行安装- 挂载镜像
[root@localhost dev]# mount /dev/cdrom /mnt
- 安装
mdadm
[root@localhost dev]# rpm -ivh mdadm-3.2.6-31.el7.x86_64.rpm
error: Failed dependencies:
libreport-filesystem is needed by mdadm-3.2.6-31.el7.x86_64
- 安装
libreport-filesystem和mdadm
[root@localhost dev]# rpm -ivh mdadm-3.2.6-31.el7.x86_64.rpm libreport-filesystem-2.1.11-10.el7.centos.x86_64.rpm
Preparing... ################################# [100%]
Updating / installing...
1:libreport-filesystem-2.1.11-10.el################################# [50%]
2:mdadm-3.2.6-31.el7 ################################# [100%]
创建RAID5
[root@localhost dev]# mdadm -C /dev/md5 -l 5 -n 3 /dev/sd{b,c,d}
mdadm: largest drive (/dev/sdc) exceeds size (8380416K) by more than 1%
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md5 started.
参数
| 参数 | 注释 |
|---|---|
| -C | 创建RAID |
| /dev/md5 | 第一个RAID设备 |
| -l 5 | RAID5 |
| -n | RAID成员的数量 |
格式化并挂载
格式化为xfs
[root@localhost dev]# mkfs.xfs /dev/md5
meta-data=/dev/md5 isize=512 agcount=16, agsize=261760 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=4188160, imaxpct=25
= sunit=128 swidth=256 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=8 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
挂载分区
- 新建md5目录
[root@localhost /]# mkdir md5
- 挂载分区
[root@localhost /]# mount /dev/md5 /md5
验证md5是否可用
- 新建文件
[root@localhost md5]# touch a{1,2,3} && ll
total 0
-rw-r--r-- 1 root root 0 Apr 7 12:39 a1
-rw-r--r-- 1 root root 0 Apr 7 12:39 a2
-rw-r--r-- 1 root root 0 Apr 7 12:39 a3
- 卸载
md5
[root@localhost md5]# umount /dev/md5
- 查看md5目录,发现什么都没了
[root@localhost /]# ll /md5
total 0
- 重新挂载md5,文件找回,则
md5分区正常
[root@localhost /]# mount /dev/md5 /md5
[root@localhost /]# ll /md5
total 0
-rw-r--r-- 1 root root 0 Apr 7 12:39 a1
-rw-r--r-- 1 root root 0 Apr 7 12:39 a2
-rw-r--r-- 1 root root 0 Apr 7 12:39 a3
查看RAID信息
[root@localhost /]# mdadm -D /dev/md5 //-D查看详细信息
/dev/md5:
Version : 1.2
Creation Time : Tue Apr 7 10:54:01 2020
Raid Level : raid5
Array Size : 16760832 (15.98 GiB 17.16 GB)
Used Dev Size : 8380416 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Tue Apr 7 12:49:32 2020
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : localhost.localdomain:5 (local to host localhost.localdomain)
UUID : 92c54122:08d15045:5724004d:5971e4d1
Events : 18
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
1 8 32 1 active sync /dev/sdc
3 8 48 2 active sync /dev/sdd
模拟一块磁盘损坏
先对分区进行卸载
[root@localhost md5]# umount /dev/md5
模拟磁盘损坏并移除
[root@localhost ~]# mdadm /dev/md5 -f /dev/sdc -r /dev/sdc
mdadm: set /dev/sdc faulty in /dev/md5
mdadm: hot removed /dev/sdc from /dev/md5
查看RAID信息
[root@localhost ~]# mdadm -D /dev/md5
/dev/md5:
Version : 1.2
Creation Time : Tue Apr 7 10:54:01 2020
Raid Level : raid5
Array Size : 16760832 (15.98 GiB 17.16 GB)
Used Dev Size : 8380416 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Tue Apr 7 12:56:41 2020
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : localhost.localdomain:5 (local to host localhost.localdomain)
UUID : 92c54122:08d15045:5724004d:5971e4d1
Events : 21
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
- 0 0 1 removed
3 8 48 2 active sync /dev/sdd
重新挂载md5,发现数据依然存在
[root@localhost ~]# mount /dev/md5 /md5
[root@localhost ~]# ll /md5
total 0
-rw-r--r-- 1 root root 0 Apr 7 12:39 a1
-rw-r--r-- 1 root root 0 Apr 7 12:39 a2
-rw-r--r-- 1 root root 0 Apr 7 12:39 a3
