11月25日 raid技术,raid10制作

[root@localhost Desktop]# cd ~

[root@localhost ~]# mdadm -Cv /dev/md0 -n 4 -l 10 /dev/sd[b-e] 创建raid10名字为/dev/md0 由四块硬盘组成硬盘编号为/dev/sdb-sde目录

mdadm: layout defaults to n2

mdadm: layout defaults to n2

mdadm: chunk size defaults to 512K  创建过程

mdadm: size set to 20954624K

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md0 started.

[root@localhost ~]# mdadm -D /dev/md0  查看raid10融合过程已达到39%

/dev/md0:

  Version : 1.2  Creation Time : Tue Nov 27 10:14:31 2018

  Raid Level : raid10  Array Size : 41909248 (39.97 GiB 42.92 GB)

  Used Dev Size : 20954624 (19.98 GiB 21.46 GB)

  Raid Devices : 4  Total Devices : 4  Persistence : Superblock is persistent  Update Time : Tue Nov 27 10:15:50 2018  State : clean, resyncing  Active Devices : 4Working Devices : 4 Failed Devices : 0

  Spare Devices : 0  Layout : near=2  Chunk Size : 512K  Resync Status : 39% complete  Name : localhost.localdomain:0  (local to host localhost.localdomain  UUID : 31b660db:ead3f4e6:47bde445:15602104

  Events : 6  Number   Major   Minor   RaidDevice State

  0  8  16  0  active sync   /dev/sdb  1  8  32  1  active sync  /dev/sdc  2  8  48  2  active sync  /dev/sdd  3  8  64  3  active sync   /dev/sde

[root@localhost ~]# mkfs.xfs /dev/md0 格式化raid10 为xfs格式

log stripe unit (524288 bytes) is too large (maximum is 256KiB)

log stripe unit adjusted to 32KiB

meta-data=/dev/md0  isize=256    agcount=16, agsize=654720 blks

  =  sectsz=51 attr=2, projid32bit=1  =                crc=0

data =  bsize=4096   blocks=10475520, imaxpct=25

  =  sunit=128    swidth=256 blks

naming   =version 2  bsize=4096   ascii-ci=0 ftype=0

log  =internal log  bsize=4096   blocks=5120, version=2

 =  sectsz=512   sunit=8 blks, lazy-count=1

realtime =none   extsz=4096   blocks=0, rtextents=0

[root@localhost ~]# mkdir /xingxing

[root@localhost ~]# mount /dev/md0  /xingxing

[root@localhost ~]# df –h  查看完成情况

Filesystem   Size  Used Avail Use% Mounted on

/dev/mapper/rhel-root  18G  2.9G   15G  17% /

devtmpfs  985M     0  985M   0% /dev

tmpfs   994M  140K  994M   1% /dev/shm

tmpfs   994M  8.9M  986M   1% /run

tmpfs   994M     0  994M   0% /sys/fs/cgroup

/dev/sda1   497M  119M  379M  24% /boot

/dev/sr   3.5G  3.5G     0 100% /run/media/root/RHEL-7.0 Server.x86_64

/dev/md    40G   33M   40G   1% /xingxing

[root@localhost ~]# vim /etc/fstab  要想永久生效,需要编辑/etc/fstab目录

Vim编译器内容

# /etc/fstab

# Created by anaconda on Mon Nov 12 17:33:13 2018

# 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

/dev/mapper/rhel-root  /   xfs     defaults  1 1

UUID=d2dd6b1a-9e33-484a-aa23-73800fb1634b /boot  xfs   defaults   1 2

/dev/mapper/rhel-swap  swap   swap  defaults   0 0

/dev/md0  /xingxing  xfs   defaults 0 0 编辑格式

[root@localhost ~]# reboot   重启生效

[root@localhost Desktop]# df –h   重启后查看硬盘信息

Filesystem             Size  Used Avail Use% Mounted on

/dev/mapper/rhel-root   18G  2.9G   15G  17% /

devtmpfs               985M     0  985M   0% /dev

tmpfs                  994M  152K  994M   1% /dev/shm

tmpfs                  994M  8.9M  986M   1% /run

tmpfs                  994M     0  994M   0% /sys/fs/cgroup

/dev/md0                40G   33M   40G   1% /xingxing

/dev/sda1              497M  119M  379M  24% /boot

/dev/sr0               3.5G  3.5G     0 100% /run/media/root/RHEL-7.0 Server.x86_64

[root@localhost Desktop]# cd /xingxing  到/星星目录下

[root@localhost xingxing]# cp -r /etc/* ./ 为了后面破坏试验添加复制/ect目录中的一些文件到raid10目录中.

[root@localhost xingxing]# mdadm /dev/md0 -r /dev/sdc .移出sdc损坏的硬盘

mdadm: hot removed /dev/sdc from /dev/md0

[root@localhost xingxing]# mdadm -D /dev/md0   查看一下移出后状态

Number  Major  Minor  RaidDevice State

  0  8  16  0  active sync   /dev/sdb  1  0  0  1  removed  2  8  48    active sync   /dev/sdd  3  8  64  3  active sync  /dev/sde

[root@localhost xingxing]#poweroff  关闭服务器并再次添加一块新的硬盘

[root@localhost Desktop]# mdadm /dev/md0 -a /dev/sdc   添加一块新硬盘命令

mdadm: added /dev/sdc

[root@localhost Desktop]# mdadm -D /dev/md0  查看raid10情况系统正在重建raid10

/dev/md0:

        Version : 1.2

  Creation Time : Tue Nov 27 10:14:31 2018

     Raid Level : raid10

     Array Size : 41909248 (39.97 GiB 42.92 GB)

  Used Dev Size : 20954624 (19.98 GiB 21.46 GB)

   Raid Devices : 4

  Total Devices : 4

    Persistence : Superblock is persistent

 

    Update Time : Tue Nov 27 10:59:52 2018

          State : clean, degraded, recovering

 Active Devices : 3

Working Devices : 4

 Failed Devices : 0

  Spare Devices : 1  Layout : near=2

     Chunk Size : 512K

 

 Rebuild Status : 24% complete