Use LVM to create an LV example

Create a volume group consisting of at least two physical volumes of 10 Gb. The PE size is 8 MB, and then create a logical volume mylv1 with a size of 5 GB in the volume group, format it as an ext4 file system and mount it to the/users directory automatically upon startup;

Create a new mageedu user. Its home directory is/users/mageedu, And Then Su to mageedu user. Copy the/etc/fstab file to your home directory;

Expand mylv1 to 7 GB to ensure that data of/users/mageedu is not affected, and then su to mageedu users to verify normal access to the positive data;

Reduce mylv1 to 4 GB to ensure that the data of/users/mageedu is not affected. Then, Su to mageedu users, and the verified data can be accessed normally;

Create a snapshot volume snap-mylv1 for mylv1 and use the data in its CP to the/backups/directory. Keep the original owner group and other information;

First, create two partitions, one 6 GB and one 4 GB, and convert the partition format to 8E (LVM format). In this example,/dev/sda3 (6 GB) is used) and/dev/sda5 (4G );

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Create PV:

# Pvcreate/dev/sda3/dev/sda5

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Create VG:

# Vgcreate-S 8 Mb/dev/myvg/dev/sda3/dev/sda5

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# Vgdisplay/dev/myvg

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Create 5g LV:

# Lvcreate-N/dev/myvg/mylv1-L 5g/dev/myvg

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# Mke2fs-T ext4/dev/myvg/mylv1

# Mkdir/users

Set automatic mounting upon startup

# Vim/etc/fstab

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# Mount

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# Useradd-D/users/mageedu

# Su-mageedu

$ CP/etc/fstab.

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Extend LV to 7G:

# Lvextend/dev/myvg/mylv-L 7G

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# Su-mageedu

$ Cat fstab

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# Umount/users

# E2fsck-F/dev/myvg/mylv1

# Resize2fs/dev/myvg/mylv1 4G

# Lvreduce/dev/myvg/mylv1-L 4G

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You can see the size change of mylv1:

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Re-mount the partition to the/users directory to verify whether the data is available:

# Mount-

# Mount

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# Su-mageedu

$ Cat fstab

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Create a snapshot volume snap-mylv1 for the mylv1 volume, first remount mylv1 to read-only mode, avoid other processes modifying data in the volume

# Mount-O remount, RO/dev/myvg/mylv1/users

# Lvcreate-S-N/dev/myvg/snap-mylv1-l 512 M-p r/dev/myvg/mylv1

# Mount-O remount, RW/dev/myvg/mylv1/users

# Mkdir/temp-Backup

# Mount/dev/myvg/snap-mylv1/temp-Backup

# Cp-A/temp-backup/backup

The entire process has ended.