RAID5 Simulation Experiment

Experiment topic: Create a RAID5 device with free space of 15g, boot automatically mount to /mnt/mydata

Here are the commands to use:

The implementation of software RAID on CENTOS6:

Combined with MD (multi devices) in the kernel

Syntax format for commands: mdadm [mode] <raiddevice> [options> <component-devices>

Supported RAID levels: LINEAR, RAID0, RAID1, RAID4, RAID5, RAID6, RAID10

Mode:

Create:-C

Assembly:-A

Monitoring:-F

Management:-F,-R,-a

<raiddevice>:/dev/md#

<component-devices>: any block device

-C: Create pattern

-N #: Create a secondary RAID using # block devices;

-1 #: Indicates the level of RAID to be created

-A {yes/no}: automatically creates a device file for the target RAID device.

-C Chunk_size: indicates block size

-X #: Indicates the number of free disks

-D: Show raid details

Mdadm-d/DEV/MDX

Management mode:

-F: Flag execution disk corruption

-A: Adding disks

-R: Remove disk

To view the status of MD:

Cat/proc/mdstat

To stop the MD device:

Mdadm-s/dev/md#

Watch command:

-N #: Refresh interval, unit is seconds;

Watch-n # ' COMMAND '

Experiment begins:

1>. See if there is free disk space

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2>. Partition the disk with the FDISK/DEV/SDB command. Create 4 partitions of 5g as the disks used to simulate the later experiments.

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3>. Modify the format of the partition, modify the format of the partition to "FS", and see if the format is modified.

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4>: Use Mdadm to create a raid. 650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M00/85/49/wKiom1efFsiAaQYYAAAP5N86eQY811.png "title=" 4.PNG " alt= "Wkiom1effsiaaqyyaaap5n86eqy811.png"/>

5> Dynamic View Watch-n 1 Cat/pro/mdstat, 8%, indicating that the corresponding number of digits is being matched.

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6>. Re-read/dev/md0 via Partx

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7>. View/dev/md0 devices (RAID 5 devices)

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8>. Format, mount, use

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9>. The following is a disk corruption of the emulated disk, viewing the state of the md0, and replacing the damaged disk with the free disk.

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10>. Simulate damage to two disks, view md0

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11>. Simulation using File system, file system is available

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13>. Simulating damage to 3 disks, simulating the use of the file system, it is clear that the file system has not been used.

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RAID5 Simulation Experiment