Logical Volume Manager
How to expand existing root partition using LVM
Add a second physical drive. Scan the system, no reboot needed:
echo "- - -" > /sys/class/scsi_host/host1/scan
Create Logic Group and Volume:
pvcreate datavg /dev/sdb1
vgcreate datavg /dev/sdb1
lvcreate -l 100%FREE -n lvdata datavg
# vgdisplay
--- Volume group ---
VG Name datavg
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 59.99 GiB
PE Size 4.00 MiB
Total PE 15358
Alloc PE / Size 15358 / 59.99 GiB
Free PE / Size 0 / 0
VG UUID zWlhGf-YDZa-27xv-aH0t-F6fW-Hs1e-TY3d8t
mkfs.ext3 -m 0 /dev/datavg/lvdata
tune2fs -c0 /dev/datavg/lvdata
Expand existing root LVM partition
pvdisplay
pvcreate /dev/sdb1
vgextend root_partition_name /dev/sdb1
lvextend -l +100%FREE /dev/root_partition_name/root
resize2fs /dev/root_partition_name/root
If you need to reduce it back:
vgreduce -a root_partition_name
