bashANYlvmpvcreatephysical-volume
bash
sudo pvcreate /dev/sdb1Prepare a partition or whole device for LVM use.
Linux LVM, RAID, and Encryption Cheat Sheet
LVM volume management, mdadm RAID, and LUKS encryption workflows.
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LVM Basics
Create and inspect physical volumes, volume groups, and logical volumes.
bashANYlvmpvsinventory
bash
sudo pvsCompact overview of LVM physical volumes.
bashANYlvmpvdisplayinventory
bash
sudo pvdisplayVerbose physical volume information including UUID and extents.
bashANYlvmvgcreatevolume-group
bash
sudo vgcreate vgdata /dev/sdb1Create a VG from one or more initialized PVs.
bashANYlvmvgsinventory
bash
sudo vgsCompact view of VGs, free extents, and sizes.
bashANYlvmvgdisplayvolume-group
bash
sudo vgdisplay vgdataVerbose VG information including free space and metadata.
bashANYlvmlvcreatelogical-volume
bash
sudo lvcreate -L 100G -n lvdata vgdataAllocate a fixed-size LV from a volume group.
bashANYlvmlvcreatefree-space
bash
sudo lvcreate -l 100%FREE -n lvdata vgdataUse all remaining free extents in the VG.
bashANYlvmlvsinventory
bash
sudo lvsPreferred compact overview of logical volumes and attributes.
bashANYlvmlvdisplayinventory
bash
sudo lvdisplay /dev/vgdata/lvdataVerbose LV information including path and size.
bashANYlvmmkfslogical-volume
bash
sudo mkfs.ext4 /dev/vgdata/lvdataFormat a new logical volume for use.
bashANYlvmmountlogical-volume
bash
sudo mount /dev/vgdata/lvdata /mnt/dataMount an LV like any other block device.
LVM Growth and Snapshots
Extend, reduce, snapshot, and move LVM storage.
bashANYlvmvgextendcapacity
bash
sudo vgextend vgdata /dev/sdc1Increase free capacity in a volume group.
bashANYlvmlvextendresize
bash
sudo lvextend -L +50G /dev/vgdata/lvdataGrow the logical volume size.
bashANYlvmlvextendfilesystem
bash
sudo lvextend -r -L +50G /dev/vgdata/lvdataGrow both the LV and the contained filesystem when supported.
bashANYresize2fsext4grow
bash
sudo resize2fs /dev/vgdata/lvdataExpand an ext filesystem to fill the larger LV.
bashANYxfs_growfsxfsgrow
bash
sudo xfs_growfs /mnt/dataExpand an XFS filesystem using the mounted path.
bashANYlvmlvreduceshrink
bash
sudo lvreduce -L 50G /dev/vgdata/lvdataDangerous if done without shrinking the filesystem first.
Shrink an ext filesystem before LV reduction
For ext filesystems, shrink the filesystem before shrinking the LV.
bashANYresize2fsext4shrink
bash
sudo resize2fs /dev/vgdata/lvdata 45GFor ext filesystems, shrink the filesystem before shrinking the LV.
bashANYlvmsnapshotlvcreate
bash
sudo lvcreate -L 10G -s -n lvdata_snap /dev/vgdata/lvdataCreate a snapshot LV for backup or rollback workflows.
bashANYlvmsnapshotlvremove
bash
sudo lvremove /dev/vgdata/lvdata_snapDelete an unneeded LVM snapshot.
bashANYlvmpvmovemigration
bash
sudo pvmove /dev/sdb1Relocate data to other PVs before removing a disk.
bashANYlvmvgreducevolume-group
bash
sudo vgreduce vgdata /dev/sdb1Detach an empty or evacuated PV from a VG.
bashANYlvmlvremovelogical-volume
bash
sudo lvremove /dev/vgdata/lvdataRemove an LV and return space to the VG.
RAID and Encryption
Software RAID and common encrypted volume workflows.
bashANYmdadmraid1create
bash
sudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1Create a mirrored software RAID device.
bashANYmdadmraid5create
bash
sudo mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1Create a RAID5 array with striping and parity.
bashANYmdadmmdstatraid
bash
cat /proc/mdstatQuick view of RAID sync, rebuild, and degraded state.
bashANYmdadmdetailraid
bash
sudo mdadm --detail /dev/md0Inspect RAID level, members, and rebuild progress.
bashANYmdadmexamineraid
bash
sudo mdadm --examine /dev/sdb1Inspect md superblock metadata directly on a member device.
bashANYmdadmstopraid
bash
sudo mdadm --stop /dev/md0Stop a software RAID device before disassembly or recovery work.
bashANYmdadmassembleraid
bash
sudo mdadm --assemble --scanDiscover and assemble arrays based on metadata or config.
bashANYmdadmmdadm.confraid
bash
sudo mdadm --detail --scan | sudo tee -a /etc/mdadm/mdadm.confPersist discovered arrays into mdadm configuration.
bashANYcryptsetupluksencrypt
bash
sudo cryptsetup luksFormat /dev/sdb1Create a LUKS-encrypted block device.
bashANYcryptsetupluksopen
bash
sudo cryptsetup open /dev/sdb1 cryptdataMap an encrypted device to /dev/mapper/cryptdata.
bashANYcryptsetupluksclose
bash
sudo cryptsetup close cryptdataLock and remove the decrypted device mapping.
bashANYcryptsetupmapperlsblk
bash
lsblk -o NAME,SIZE,TYPE,FSTYPE,MOUNTPOINTSVerify decrypted mapper devices and mountpoints.
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