pvs / vgs / lvs

Examples

• vgsCheck free extentsCopy
• lvs -a -o +devicesWhich physical volumes each LV usesCopy
• pvcreate /dev/sdb && vgextend vg01 /dev/sdbAdd a disk and grow the VGCopy
• lvextend -r -L +20G /dev/vg01/lv_dataGrow the LV and its file system by 20 GBCopy

Syntax

pvs / vgs / lvs [-a -o +devices]

Key points

• Growth goes disk (PV) → VG → LV → file system. lvextend -r handles the file-system step too.
• If VFree in vgs is 0, add a disk before growing an LV.
• XFS cannot be shrunk, so size such volumes conservatively.

When it does not work

• If df shows the old size after lvextend, the file system was not grown. Run xfs_growfs <mount point> for XFS or resize2fs <device> for ext4.
• If a new disk does not appear, rescan with echo "- - -" > /sys/class/scsi_host/host0/scan.