LVM

Notes on LVM

1. PV commands => working on physical disk
2. VG commands => virtual groups
3. LV commands => logical volumes

Create a bunch of small (100MB) virtual disks for use with LVM.

DISK_DIR=/var/tmp/disks
mkdir -p ${DISK_DIR} &&
for i in 1 2 3 4 5; do
    dd if=/dev/zero of=${DISK_DIR}/disk${i} bs=100M count=1 &&
    losetup /dev/loop${i} ${DISK_DIR}/disk${i} &&
    pvcreate /dev/loop${i}
done

Output should look like this

1+0 records in
1+0 records out
104857600 bytes (105 MB) copied, 0.50751 s, 207 MB/s
  Physical volume "/dev/loop1" successfully created
1+0 records in
1+0 records out
104857600 bytes (105 MB) copied, 1.94502 s, 53.9 MB/s
  Physical volume "/dev/loop2" successfully created
1+0 records in
1+0 records out
104857600 bytes (105 MB) copied, 4.12227 s, 25.4 MB/s
  Physical volume "/dev/loop3" successfully created
1+0 records in
1+0 records out
104857600 bytes (105 MB) copied, 1.51487 s, 69.2 MB/s
  Physical volume "/dev/loop4" successfully created
1+0 records in
1+0 records out
104857600 bytes (105 MB) copied, 3.88262 s, 27.0 MB/s
  Physical volume "/dev/loop5" successfully created