Disk management-raid1 + 0 volume + LVM

Disk Management

-- Raid1 + 0 volume + LVM

Preparations

Take two disks as an example: SDB and SDC. Three primary partitions are created for each hard disk.

Sdb1 1g, sdb2 1g, sdb3 1g

Sdc1 1g, sdc2 1g, sdc3 1g

Step 1: Create sdb1, sdc1, sdb2, sdc2, sdb3, and sdc3 as raid1, md1, md2, and md3 respectively.

Step 2: Create md1, md2, and md3 as raid0 volume md0

Step 3: Use LVM volume management to create the raid0 volume md0 and create the LV logical volume storage.

 

Add two hard drive SDB and SDC

 

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Manage Disks

View version information

[[Email protected] ~] # Uname-

 

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[[Email protected] ~] # Cat/etc/RedHat-release

 

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View existing Disks

[[Email protected] ~] # Fdisk-l

 

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Add a hard disk and use commands to make the disk take effect (if the disk does not take effect, restart the server)

[[Email protected] ~] # Cd/sys/class/scsi_host/

[[Email protected] scsi_host] # ls

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[[Email protected] ~] # Echo "---">/sys/class/scsi_host/host0/scan

... (There are several host * files and several echo commands are executed)

[[Email protected] ~] # Echo "---">/sys/class/scsi_host/host32/scan

 

View disk status again

[[Email protected] scsi_host] # fdisk-l

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Partition/dev/SDB Disk

[[Email protected] _ host] # fdisk/dev/SDB

 

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Similarly, create a/dev/SDC disk partition.

[[Email protected] _ host] # fdisk/dev/SDC

View the mdadm version

[[Email protected] scsi_host] # rpm-Qi mdadm

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Create raid1 volume

[[Email protected] _ host] # mdadm-C/dev/md1-L 1-N 2/dev/sdb1/dev/sdc1

 

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Similarly, two RAID 1 volumes are created.

[[Email protected] _ host] # mdadm-C/dev/md2-L 1-N 2/dev/sdb2/dev/sdc2

[[Email protected] _ host] # mdadm-C/dev/md3-L 1-N 2/dev/sdb3/dev/sdc3

Create raid0 volume

[[Email protected] _ host] # mdadm-C/dev/md0-l 0-N 3/dev/MD {1, 2, 3}

 

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View the log file for creating a raid volume

[[Email protected] _ host] # Cat/proc/mdstat

 

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Use raid0 volume to create LVM logical volume

[[Email protected] scsi_host] # pvcreate/dev/md0

 

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[[Email protected] scsi_host] # vgcreate vg_md/dev/md0

 

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[[Email protected] scsi_host] # lvcreate-L 1G-N lv1_md vg_md

 

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View created logical volume information

[[Email protected] scsi_host] # lvdisplay/dev/vg_md/lv1_md

 

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Format a logical volume

[[Email protected] scsi_host] # mkfs. ext4/dev/vg_md/lv1_md

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Create a directory, mount the logical volume to the directory, and view the mount information

[[Email protected] scsi_host] # mkdir/mdamd_lv1

[[Email protected] scsi_host] # Mount/dev/vg_md/lv1_md/mdamd_lv1

[[Email protected] scsi_host] # DF-H

 

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Set automatic mounting

[[Email protected] scsi_host] # vi/etc/fstab

 

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Verify whether the available disk space is 3 GB after raid1 is created

The lv1_md + lv2_md + lv3_md capacity is exactly 3 GB, and an error will be reported when the fourth one is created.

[[Email protected] scsi_host] # lvcreate-L 1G-N lv2_mdvg_md

[[Email protected] scsi_host] # lvcreate-L 1G-N lv3_mdvg_md

[[Email protected] scsi_host] # lvcreate-L 1G-N lv4_mdvg_md

 

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Same as lvw.md, formatting, mounting,

[[Email protected] scsi_host] # mkfs. ext4/dev/vg_md/lv2_md

[[Email protected] scsi_host] # mkfs. ext4/dev/vg_md/lv3_md

[[Email protected] scsi_host] # mkdir/mdamd_lv2

[[Email protected] scsi_host] # mkdir/mdamd_lv3

[[Email protected] scsi_host] # Mount/dev/vg_md/lv2_md/mdamd_lv2

[[Email protected] scsi_host] # Mount/dev/vg_md/lv3_md/mdamd_lv3

[[Email protected] scsi_host] # DF-lH

 

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Set automatic mounting

[[Email protected] _ host] # vi/etc/fstab

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End lab

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