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Rhel7 logical volume management - Notes

2022-04-22 08:46:00 【Firefly ignition】

One . Create one with at least two PV The size of the composition is 20G The name is testvg Of VG; requirement PE The size is 16MB, Then create a volume group with a size of 5G The logic of Volume collection testlv; Mount to /users Catalog .

  1. Prepare two 10G The partition （linux LVM）.
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  2. establish PV Physical volume 、 see PV Physical volume .
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  3. establish VG The volume group , View assigned PE Related information .
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  4. establish 5G The logical volume , The name is testlv, see LV list .
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  5. Create file system （ Formatted as ext4 File system type ）.
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  6. Create a directory and mount , Check the partition condition and size .
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  7. Set up auto mount .
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Two . A new user archlinux, The home directory is required to be /users/archlinux, Then su Switch to archlinux user , Copy /etc/pam.d Directory to your home directory .

  1. Create a user and specify their home directory .
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    see ：
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  2. Switching users , And copy the file .
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  3. View the number of files .
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3、 ... and . Expand testlv to 7G, requirement archlinux User files cannot be lost .

  1. First check the size that needs to be expanded ,VG Is there enough free space .
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  2. View the logical volume
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  3. Expand logical volume size .
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  4. Check the logical volume size again .
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  5. View copied pam.d The number of files in the directory .
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Four . shrinkage testlv to 3G, requirement archlinux User files cannot be lost .

  1. Uninstall file system .
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  2. Check whether the file system is intact .
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  3. Set file system size .
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  4. Reduced logical volume .
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  5. Check the logical volume size again .
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  6. Mount again .
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  7. see pam.d The number of files in the directory .
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5、 ... and . Yes testlv Create a snapshot , And try to backup data based on snapshot , Verify the function of snapshot

  1. Create size as 1G Read only snapshot .
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  2. View snapshots .
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  3. Create a snapshot directory and mount .
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  4. Delete /users/archlinux/pam.d China and Israel a Opening file .
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  5. View in snapshot pam.d Number of files in .
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  6. Backup snapshot volume data （ Pack it up tar.gz My bag ）.
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  7. Cancel the mount .

umount /mnt/snap

  1. Restore files （ Decompress package ）
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  2. Check the number of original files , Whether the data is recovered successfully ？
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