Linux Disk Management--raid1 creation

1.  Scene2.  PocEnvironment

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# uname-a

Linux localhost 3.10.0-123.el7.x86_64 #1SMP Mon June 12:09:22 UTC x86_64 x86_64 x86_64 gnu/linux

# Cat/etc/redhat-release

CentOS Linux release 7.0.1406 (Core)

3.  Specific Operation3.1.  Partitioning

# fdisk-l

disk/dev/sdc:32.2 GB, 32212254720 bytes,62914560 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512bytes

disk/dev/sdd:32.2 GB, 32212254720 bytes,62914560 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512bytes

.........

# FDISK/DEV/SDC

..........

Command (M for help): P

disk/dev/sdc:32.2 GB, 32212254720 bytes,62914560 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512bytes

Disk label Type:dos

Disk IDENTIFIER:0X3DBF19DC

Device Boot Start End Blocks Id System

Command (M for help): n

Partition Type:

P Primary (0 primary, 0extended, 4 free)

E Extended

Select (default P): p

Partition number (1-4, default 1):

First sector (2048-62914559, default 2048):

Using Default Value 2048

Last sector, +sectors or +size{k,m,g} (2048-62914559, default 62914559):

Using Default Value 62914559

Partition 1 of type Linux and of size 30GiB is set

Command (M for help): t

Selected partition 1

Hex code (type L to list all codes): FD

Changed type of partition ' Linux ' to ' Linuxraid AutoDetect '

Command (M for help): W

The partition table has been altered!

Calling IOCTL () to re-read partition table.

Syncing disks.

# FDISK-L/DEV/SDC

disk/dev/sdc:32.2 GB, 32212254720 bytes, 62914560sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512bytes

Disk label Type:dos

Disk IDENTIFIER:0X3DBF19DC

Device Boot Start End Blocks Id System

/DEV/SDC1 2048 62914559 31456256 fd Linux raid AutoDetect

Perform the same partitioning operation on the/DEV/SDD

# FDISK-L/DEV/SDD

disk/dev/sdd:32.2 GB, 32212254720 bytes,62914560 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512bytes

Disk label Type:dos

Disk IDENTIFIER:0X2B1E2FEF

Device Boot Start End Blocks Id System

/DEV/SDD1 2048 62914559 31456256 fd Linux raid AutoDetect

3.2.  CreateRAID1

# Mount/dev/cdrom/mnt/cdrom

Mount:/dev/sr0 is write-protected,mounting read-only

# cd/mnt/cdrom/packages

# ls md*

mdadm-3.2.6-31.el7.x86_64.rpm

# rpm-uvhmdadm-3.2.6-31.el7.x86_64.rpm

error:failed dependencies:

Libreport-filesystem is needed by mdadm-3.2.6-31.el7.x86_64

#rpm-UVH mdadm-3.2.6-31.el7.x86_64.rpmlibreport-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%]

# mdadm-c/dev/md0-l 1-n 2/dev/sd[cd]1

Mdadm:-C does not set the mode, and Socannot is the first option.

[Email protected] packages]# mdadm--create/dev/md0-l 1-n 2/dev/sd[cd]1

Mdadm:Note:this array has metadata at TheStart and

May is suitable as a boot device. If you plan to

Store '/boot ' on this device, ensure that

Your Boot-loader understands md/v1.x metadata, or use

--metadata=0.90

Continue creating array? Yes

Mdadm:defaulting to version 1.2 metadata

Mdadm:array/dev/md0 started.

3.3.  creating a file system

Format a disk array

# mkfs.ext4/dev/md0

MKE2FS 1.42.9 (28-dec-2013)

Filesystem label=

OS Type:linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

1966080 inodes, 7859936 blocks

392996 blocks (5.00%) reserved for thesuper user

First Data block=0

Maximum filesystem blocks=2155872256

Block groups

32768 blocks per group, 32768 fragments Pergroup

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,

4096000

Allocating group Tables:done

Writing Inode Tables:done

Creating Journal (32768 blocks): Done

Writing Superblocks and Filesystemaccounting Information:done

#mkdir/data

# Mount/dev/md0/data

# Ll/data

Total 16

drwx------2 root root 16384 03:01lost+found

Set up auto mount on boot

# Vi/etc/fstab

Add a row at the end

/dev/md0/data EXT4 Defaults 0 0

# Mdadm-ds

Array/dev/md0 metadata=1.2 name=localhost:0 uuid=e236da40:5469327f:1683de23:2d391d6f

Write to configuration file

# mdadm-ds>>/etc/mdadm.conf

Restart verification

#reboot

# mount

/dev/md0 on/data type EXT4 (rw,relatime,data=ordered)

# Cat/proc/mdstat

Personalities: [RAID1]

Md0:active RAID1 sdd1[1] sdc1[0]

31439744 Blocks Super 1.2 [2/2] [UU]

Unused devices: <none>

4.  Analog Failure

Delete the 30ga.vmdk

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# Cat/proc/mdstat

Personalities: [RAID1]

Md0:active RAID1 Sdc1[1]

31439744 blocks Super 1.2 [2/1] [_u]

Unused devices: <none>

5.  RebuildingRAID1

To simulate a recovery, or a 30GB hard disk, add a new disk file to 30GC. VMDK

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# fdisk-l

# mdadm/dev/md0-a/DEV/SDC1

Mdadm:added/dev/sdc1

# Cat/proc/mdstat

Personalities: [RAID1]

Md0:active RAID1 sdc1[2] sdd1[1]

31439744 blocks super1.2 [2/1] [_u]

[==>.........] Recovery = 11.3% (3554240/31439744) finish=2.2min speed=209072k/sec

Unused devices: <none>

View Logs

Md:bind<sdc1>

Md:recovery of RAID Array md0

Md:minimum _guaranteed_ speed:1000 Kb/sec/disk.

Md:using Maximum available idle IO bandwidth (but not more than200000 kb/sec) for recovery.

md:using 128k window, over a total of 31439744k.