Create a soft RAID1 battle under Linux

[[Email protected] ~]# Date

Thu 20:45:34 CST 2016

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

Welcome to Fdisk (Util-linux 2.23.2).

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

Be careful before using the Write command.

Device does not contain a recognized partition table

Building a new DOS disklabel with disk identifier 0XE1F55A32.

Command (M for help): P

disk/dev/sdc:5368 MB, 5368709120 bytes, 10485760 sectors

Units = sectors of 1 * MB = bytes

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

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

Disk label Type:dos

Disk Identifier:0xe1f55a32

Device Boot Start End Blocks Id System

Command (M for help): N

Partition Type:

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

E Extended

Select (default p): P

Partition number (1-4, default 1):

First sector (2048-10485759, default 2048):

Using Default Value 2048

Last sector, +sectors or +size{k,m,g} (2048-10485759, default 10485759):

Using Default Value 10485759

Partition 1 of type Linux and of size 5 GiB is set

Command (M for help): t

Selected partition 1

Hex code (type L to list all codes): FD #fd: Linux RAID mode

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

Command (M for help): P

disk/dev/sdc:5368 MB, 5368709120 bytes, 10485760 sectors

Units = sectors of 1 * MB = bytes

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

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

Disk label Type:dos

Disk Identifier:0xe1f55a32

Device Boot Start End Blocks Id System

/DEV/SDC1 2048 10485759 5241856 fd Linux raid AutoDetect

Command (M for help): W

The partition table has been altered!

Calling IOCTL () to re-read partition table.

Syncing disks.

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

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

[Email protected] ~]# ls/dev/sdb*

/dev/sdb/dev/sdb1

[Email protected] ~]# ls/dev/sdc*

/dev/sdc/dev/sdc1

Check if the disk can be created RAID1

[Email protected] ~]# MDADM-E/dev/sd[b-c]

/DEV/SDB:

MBR Magic:aa55

PARTITION[0]: 10483712 Sectors at 2048 (type FD)

/DEV/SDC:

MBR Magic:aa55

PARTITION[0]: 10483712 Sectors at 2048 (type FD)

Create RAID1

[Email protected] ~]# mdadm-c-v/dev/md1-l 1-n 2/DEV/SDB1/DEV/SDC1

Mdadm:Note:this array have metadata at the start 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

Mdadm:size set to 5237696K

Continue creating array? Y

Mdadm:defaulting to version 1.2 metadata

MDADM:ARRAY/DEV/MD1 started.

View RAID Status

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

Personalities: [RAID1]

Md1:active RAID1 sdc1[1] sdb1[0]

5237696 Blocks Super 1.2 [2/2] [UU]

[============> ...] Resync = 60.6% (3175232/5237696) finish=0.1min speed=211682k/sec

Unused devices: <none>

[email protected] ~]# Watch Cat/proc/mdstat

View the status of two disks

[Email protected] ~]# mdadm-e/DEV/SDB1/DEV/SDC1

/DEV/SDB1:

Magic:a92b4efc

version:1.2

Feature map:0x0

Array UUID:B3F8134A:ABC56378:C6498702:55215F10

Name:rhel7.2:1 (Local to host RHEL7.2)

Creation Time:thu 18 20:49:27 2016

Raid LEVEL:RAID1

Raid Devices:2

Avail Dev size:10475520 (5.00 GiB 5.36 GB)

Array size:5237696 (5.00 GiB 5.36 GB)

Used Dev size:10475392 (5.00 GiB 5.36 GB)

Data offset:8192 Sectors

Super Offset:8 Sectors

State:clean

Device uuid:4cb9ba13:784b2294:29e78967:d93d8a94

Update Time:thu 18 20:49:54 2016

Checksum:595f46a0-correct

Events:17

Device role:active Device 0

Array state:aa (' A ' = = active, '. ' = = missing)

/DEV/SDC1:

Magic:a92b4efc

version:1.2

Feature map:0x0

Array UUID:B3F8134A:ABC56378:C6498702:55215F10

Name:rhel7.2:1 (Local to host RHEL7.2)

Creation Time:thu 18 20:49:27 2016

Raid LEVEL:RAID1

Raid Devices:2

Avail Dev size:10475520 (5.00 GiB 5.36 GB)

Array size:5237696 (5.00 GiB 5.36 GB)

Used Dev size:10475392 (5.00 GiB 5.36 GB)

Data offset:8192 Sectors

Super Offset:8 Sectors

State:clean

Device uuid:841e8e8c:b3ffe403:a487475c:c899e735

Update Time:thu 18 20:49:54 2016

Checksum:d8105c7d-correct

Events:17

Device role:active device 1

Array state:aa (' A ' = = active, '. ' = = missing)

View RAID1 Status

[Email protected] ~]# mdadm-d/dev/md1

/DEV/MD1:

version:1.2

Creation Time:thu 18 20:49:27 2016

Raid LEVEL:RAID1

Array size:5237696 (5.00 GiB 5.36 GB)

Used Dev size:5237696 (5.00 GiB 5.36 GB)

Raid Devices:2

Total Devices:2

Persistence:superblock is persistent

Update Time:thu 18 20:49:54 2016

State:clean

Active Devices:2

Working devices:2

Failed devices:0

Spare devices:0

Name:rhel7.2:1 (Local to host RHEL7.2)

Uuid:b3f8134a:abc56378:c6498702:55215f10

Events:17

Number Major Minor Raiddevice state

0 8 0 Active SYNC/DEV/SDB1

1 8 1 Active SYNC/DEV/SDC1

[Email protected] ~]#

Formatting

[Email protected] ~]# mkfs.xfs-f/dev/md1

Meta-data=/dev/md1 isize=256 agcount=4, agsize=327356 blks

= sectsz=512 attr=2, projid32bit=1

= Crc=0

data = bsize=4096 blocks=1309424, imaxpct=25

= Sunit=0 swidth=0 blks

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

Log =internal log bsize=4096 blocks=2560, version=2

= sectsz=512 sunit=0 Blks, lazy-count=1

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

[Email protected] ~]# MKDIR/RAID1

[Email protected] ~]# mount/dev/md1/raid1/

[Email protected] ~]# cd/raid1/

[[email protected] raid1]# dd If=/dev/zero OF=/RAID1/AA bs=2m count=100

100+0 Records in

100+0 Records out

209715200 bytes (+ MB) copied, 1.7897 s, 117 MB/s

[[email protected] raid1]# ls

Aa

[Email protected] raid1]# DU/RAID1

204800/raid1

This article is from the "Technical Achievement Dream" blog, please be sure to keep this source http://andyliu.blog.51cto.com/518879/1840109

Create a soft RAID1 battle under Linux