Linux Disk Management ~~~~raid1

Linux Disk Management ~~~~raid1

Experimental environment

Add 2 30g -size disks to the Linux operating system's pc

Implementation steps:

1.0

Partitioning a disk

[[Email protected]~]# fdisk/dev/sdb

Device contains neither a valid dospartition table, nor Sun, SGI or OSF Disklabel

Building a new DOS disklabel with Diskidentifier 0x5a1d7a13.

Changes'll remain in memory only, Untilyou decide to write them.

After that, of course, the previous Contentwon ' t is recoverable.

Warning:invalid flag 0x0000 of partitiontable 4 would be corrected by W (rite)

Warning:dos-compatible mode is deprecated. It ' s strongly recommended to

Switch off the mode (command ' C ') and change display units to

Sectors (Command ' u ').

Command (M for help): N

Command Action

E Extended

P primary partition (1-4)

P

Partition number (1-4): 1

First cylinder (1-3916, default 1):

Using Default value 1

Last cylinder, +cylinders or +size{k,m,g} (1-3916, default 3916): +300m

Command (M for help): W

The partition table has been altered!

Calling IOCTL () to re-read partition table.

Syncing disks.

[Email protected] ~]# FDISK/DEV/SDC

Device contains neither a valid dospartition table, nor Sun, SGI or OSF Disklabel

Building a new DOS disklabel with Diskidentifier 0xa5a6acdf.

Changes'll remain in memory only, Untilyou decide to write them.

After that, of course, the previous Contentwon ' t is recoverable.

Warning:invalid flag 0x0000 of partitiontable 4 would be corrected by W (rite)

Warning:dos-compatible mode is deprecated. It ' s strongly recommended to

Switch off the mode (command ' C ') and change display units to

Sectors (Command ' u ').

Command (M for help): N

Command Action

E Extended

P primary partition (1-4)

P

Partition number (1-4): 1

First cylinder (1-3916, default 1):

Using Default value 1

Last cylinder, +cylinders or +size{k,m,g} (1-3916, default 3916): +400m

Command (M for help): W

installing the Mdadm package

[Email protected] ~]# Mkdir/mnt/cdrom

[Email protected] ~]# mount/dev/cdrom/mnt/cdrom/

Mount:block device/dev/sr0 iswrite-protected, mounting read-only

[Email protected] ~]# cd/mnt/cdrom/packages/

[[email protected] packages]# ls mdadm*

mdadm-3.2.5-4.el6.x86_64.rpm

[Email protected] packages]# rpm-uvhmdadm-3.2.5-4.el6.x86_64.rpm

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Create RAID1

[Email protected] packages]# Mdadm-cv/dev/md0-l1-n2/dev/sdc/dev/sdb

Mdadm:/dev/sdc appears to Bepart of a RAID array:

LEVEL=RAID0 devices=0 ctime=thu Jan 1 08:00:00 1970

Mdadm:partition table EXISTSON/DEV/SDC but would be lost or

Meaningless after creating array

Mdadm:Note:this Array Hasmetadata at the start and

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

Store '/boot ' on this device ensurethat

Your Boot-loader understands Md/v1.xmetadata, or use

--metadata=0.90

Mdadm:/dev/sdb appears to Bepart of a RAID array:

LEVEL=RAID0 devices=0 ctime=thu Jan 1 08:00:00 1970

Mdadm:partition table Existson/dev/sdb but would be lost or

Meaningless after creating array

Mdadm:size set to 31440768K

Continue creating array? Y

Mdadm:defaulting to version1.2 metadata

Mdadm:array/dev/md0 started.

[Email protected] packages]# ls/dev/md0

/dev/md0

View

[Email protected] packages]# mdadm--detail/dev/md0

/DEV/MD0:

version:1.2

Creation Time:thu 14 16:02:21 2014

Raid LEVEL:RAID1

Array size:31440768 (29.98 GiB 32.20 GB)

Used Dev size:31440768 (29.98 GiB 32.20 GB)

Raid Devices:2

Total Devices:2

Persistence:superblock is persistent

Update Time:thu 14 16:04:40 2014

State:clean, resyncing

Active Devices:2

Working devices:2

Failed devices:0

Spare devices:0

Resync status:89% Complete

name:host129.localdomain:0 (Local to host Host129.localdomain)

Uuid:10fa6c5d:1afaebc6:85f51847:e1f0b2ed

Events:14

Number Major Minor Raiddevice state

0 8 0 Active SYNC/DEV/SDC

1 8 1 Active Sync/dev/sdb

Formatting

[Email protected] packages]# mkfs.ext4/dev/md0

MKE2FS 1.41.12 (17-may-2010)

File system Label =

operating system : Linux

Block Size =4096 (log=2)

chunked size =4096 (log=2)

Stride=0 blocks, stripewidth=0 blocks

1966080 inodes, 7860192 blocks

393009 blocks (5.00%) reservedfor the Super User

first block of data =0

Maximum filesystem blocks=4294967296

Block groups

32768 blocks per group, 32768fragments per group

8192 inodes per group

Superblock Backups stored onblocks:

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

4096000

writing inode table : Complete

Creating Journal (32768blocks): complete

Writing superblocks andfilesystem Accounting information: complete

This filesystem'll beautomatically checked every mounts or

Whichever comesfirst. Use Tune2fs-c or-i to override.

Create a System file

[Email protected] ~]# MKDIR/QQ

[Email protected] ~]# mount/dev/md0/qq/

[Email protected] ~]# LL/QQ

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[Email protected] ~]# Vi/etc/txt

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View and write to config = file

[Email protected] ~]# Mdadm-ds

Array/dev/md0 metadata=1.2 name=host129.localdomain:0uuid=10fa6c5d:1afaebc6:85f51847:e1f0b2ed

[Email protected] ~]# Mdadm-ds >>/etc/mdadm.conf

Restart PC Machine to verify

[[Email protected]~]# reboot

[email protected] ~]# mount

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[Email protected] ~]# Cat/proc/mdstat

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Delete a hard disk 2 make analog Failure

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View Logs

[Email protected] ~]# DMESG

Reorganization RAID1 analog Recovery, or 30GB the hard drive, adding a new disk file will 30GBC.VMDK

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Fdisk-l/dev/sdb

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Join the new

[Email protected] ~]# mdadm/dev/md0-a/DEV/SDC

Mdadm:added/dev/sdc

[Email protected] ~]# Cat/proc/mdstat

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The process of rebuilding can be viewed in the log

This article from "Why, so painful" blog, declined to reprint!