[[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