The blkid command in Linux identifies block devices and displays metadata like UUIDs, device paths, filesystem types, encryption layers, and block sizes.

It’s an essential tool for system administrators who need to manage storage devices, mount points, or encrypted volumes.

In the output shown, /dev/mapper/dm_crypt-0 represents an encrypted volume managed by dm-crypt and tagged as a LVM2_member, which means it belongs to a logical volume group.

The second line, /dev/mapper/ubuntu--vg-ubuntu--lv, reveals the logical volume itself, formatted with the ext4 filesystem and a 4096-byte block size. UUIDs shown are crucial for reliably identifying devices in /etc/fstab, ensuring correct mounting even if device names change.

According to Red Hat, LVM allows dynamic volume resizing and abstraction over physical disks, while UUIDs are used to avoid conflicts between device names after hardware changes or reboots.

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