CentOS6.5 soft RAID 0 Creation

CentOS6.5 soft RAID 0 Creation
CentOS6.5


1. yum install-y mdadm parted


[Root @ mytest1 ~] # Yum install mdadm parted


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Package Arch Version Repository Size
========================================================== ==========================================================
Installing:
Mdadm x86_64 3.2.6-7. el6_5.2 updates 337 k
Parted x86_64 2.1-21. el6 base 606 k


Transaction Summary
========================================================== ==========================================================




2. For sdb and sdc disk partitions, Set


[Root @ mytest1 ~] # Fdisk/dev/sdc


WARNING: DOS-compatible mode is deprecated. It's stronugly recommended
Switch off the mode (command 'C') and change display units
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 (1-1305, default 1 ):
Using default value 1
Last cylinder, + cylinders or + size {K, M, G} (1-1305, default 1305 ):
Using default value 1305


Command (m for help): t
Selected partition 1
Hex code (type L to list codes): fd
Changed system type of partition 1 to fd (Linux raid autodetect)


Command (m for help): p


Disk/dev/sdc: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065*512 = 8225280 bytes
Sector size (logical/physical): 512 bytes/512 bytes
I/O size (minimum/optimal): 512 bytes/512 bytes
Disk identifier: 0x000c7662


Device Boot Start End Blocks Id System
/Dev/sdc1 1 1305 10482381 fd Linux raid autodetect


Command (m for help): w
The partition table has been altered!


Calling ioctl () to re-read partition table.
Syncing disks.


3. reboot-free partition Synchronization
[Root @ mytest1 ~] # Partprobe
Warning: WARNING: the kernel failed to re-read the partition table on/dev/sda (Device or resource busy ). as a result, it may not reflect all of your changes until after reboot.


4. view the status of the two disks
[Root @ mytest1 ~] # Fdisk-l/dev/sdb/dev/sdc


Disk/dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065*512 = 8225280 bytes
Sector size (logical/physical): 512 bytes/512 bytes
I/O size (minimum/optimal): 512 bytes/512 bytes
Disk identifier: 0x0af7aca1


Device Boot Start End Blocks Id System
/Dev/sdb1 1 1305 10482381 fd Linux raid autodetect


Disk/dev/sdc: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065*512 = 8225280 bytes
Sector size (logical/physical): 512 bytes/512 bytes
I/O size (minimum/optimal): 512 bytes/512 bytes
Disk identifier: 0x000c7662


Device Boot Start End Blocks Id System
/Dev/sdc1 1 1305 10482381 fd Linux raid autodetect


5. Create raid0
[Root @ mytest1 ~] # Mdadm-C/dev/md0-ayes-l0-n2/dev/sd {B, c} 1
Mdadm: Defaulting to version 1.2 metadata
Mdadm: array/dev/md0 started.


6. view the status
[Root @ mytest1 ~] # Cat/proc/mdstat
Personalities: [raid0]
Md0: active raid0 sdc1 [1] sdb1 [0]
20964352 blocks super 1.2 512 k chunks

Unused devices: <none>


[Root @ mytest1 ~] # Mdadm-D/dev/md0
/Dev/md0:
Version: 1.2
Creation Time: Sun Aug 10 14:15:50 2014
Raid Level: raid0
Array Size: 20964352 (19.99 GiB 21.47 GB)
Raid Devices: 2
Total Devices: 2
Persistence: Superblock is persistent


Update Time: Sun Aug 10 14:15:50 2014
State: clean
Active Devices: 2
Working Devices: 2
Failed Devices: 0
Spare Devices: 0


Chunk Size: 512 K


Name: mytest1: 0 (local to host mytest1)
UUID: c62a98dc: 7f802f31: 6e4435ae: 168a6829
Events: 0


Number Major Minor RaidDevice State
0 8 17 0 active sync/dev/sdb1
1 8 33 1 active sync/dev/sdc1


6. Create the mdadm configuration file
[Root @ mytest1 ~] # Echo DEVICE/dev/sd {B, c} 1>/etc/mdadm. conf
[Root @ mytest1 ~] # Mdadm-Ds>/etc/mdadm. conf
[Root @ mytest1 ~] # Vi/etc/mdadm. conf


DEVICE/dev/sdb1/dev/sdc1
ARRAY/dev/md0 level = raid0 num-devices = 2 UUID = c62a98dc: 7f802f31: 6e4435ae: 168a6829


7. Create a File System
[Root @ mytest1 ~] # Mkfs. ext4/dev/md0
Mke2fs 1.41.12 (17-May-2010)
Filesystem label =
OS type: Linux
Block size = 4096 (log = 2)
Fragment size = 4096 (log = 2)
Stride = 128 blocks, Stripe width = 256 blocks
1310720 inodes, 5241088 blocks
262054 blocks (5.00%) reserved for the super user
First data block = 0
Maximum filesystem blocks = 4294967296
160 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768,983 04, 163840,229 376, 294912,819 200, 884736,160 5632, 2654208,
4096000


Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done


This filesystem will be automatically checked every 37 mounts or
180 days, whichever comes first. Use tune2fs-c or-I to override.


8. automatic mounting upon startup
[Root @ mytest1 ~] # Mkdir/raid0disk
[Root @ mytest1 ~] # Vi/etc/fstab
#
#/Etc/fstab
# Created by anaconda on Sun Aug 10 02:32:47 2014
#
# 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/vg_mytest1-root/ext4 ults 1 1
UUID = af6ed5f7-9181-440e-9b49-fff643caba9d/boot ext4 ults 1 2
/Dev/mapper/vg_mytest1-tmp/tmp ext4 defaults 1 2
Tmpfs/dev/shm tmpfs defaults 0 0
Devpts/dev/pts devpts gid = 5, mode = 620 0 0
Sysfs/sys sysfs defaults 0 0
Proc/proc defaults 0 0
/Dev/md0/raid0disk ext4 defaults 0 0
~
~
"/Etc/fstab" 16L, 816C written


9. Confirm after mounting
[Root @ mytest1 ~] # Mount-
[Root @ mytest1 ~] # Df-h
Filesystem Size Used Avail Use % Mounted on
/Dev/mapper/vg_mytest1-root 6.8G 781 M 5.7G 12%/
Tmpfs 939 M 0 939 M 0%/dev/shm
/Dev/sda1 97 M 28 M 64 M 31%/boot
/Dev/mapper/vg_mytest1-tmp 1008 M 34 M 924 M 4%/tmp
/Dev/md0 20G 172 M 19G 1%/raid0disk