echo "- - -" > /sys/class/scsi_host/host0/scan

fdisk -l

fdisk /dev/sdb

pvcreate /dev/sdb1

vgdisplay 查看卷组的名字

--- Volume group ---

VG Name vg_app00 卷组的名字

System ID

Format lvm2

Metadata Areas 2

Metadata Sequence No 4

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 2

Open LV 2

Max PV 0

Cur PV 2

Act PV 2

VG Size 52.80 GiB

PE Size 4.00 MiB

Total PE 13517

Alloc PE / Size 12674 / 49.51 GiB

Free PE / Size 843 / 3.29 GiB

VG UUID PLXhIk-axTB-UcSH-SzBq-UBlE-WTMW-4E3gcS

vgextend vg_app00 /dev/sdb1

df -hT 查磁盘的不足的在哪

Filesystem Type Size Used Avail Use% Mounted on

/dev/mapper/vg_app00-lv_root

ext4 49G 5.0G 41G 11% /

tmpfs tmpfs 1.9G 228K 1.9G 1% /dev/shm

/dev/sda1 ext4 49G 5.0G 41G 11% /boot

/dev/sr0 iso9660 3.6G 3.6G 0 100% /media/cdrom

mount 查看一下你要扩展的

/dev/mapper/vg_app00-lv_root on / type ext4 (rw)

proc on /proc type proc (rw)

sysfs on /sys type sysfs (rw)

devpts on /dev/pts type devpts (rw,gid=5,mode=620)

tmpfs on /dev/shm type tmpfs (rw)

/dev/sda1 on /boot type ext4 (rw)

none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)

gvfs-fuse-daemon on /root/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev)

/dev/sr0 on /media/cdrom type iso9660 (ro)

lvextend -l +100%FREE /dev/mapper/vg_app00-lv_root

resize2fs /dev/mapper/vg_app00-lv_root

df -hT查看/dev/mapper/vg_app00-lv_root exit4 原来有46G 又增加了3个G证明成功