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Linux使用LVM邏輯卷擴容

parted -m file orm may syn lvextend mount fdisk

[root@nagios_client1 ~]# lvs #查看邏輯卷

LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert

lv_root VolGroup -wi-ao---- 8.51g

lv_swap VolGroup -wi-ao---- 1.00g

[root@nagios_client1 ~]# vgs #查卷組

VG #PV #LV #SN Attr VSize VFree

VolGroup 1 2 0 wz--n- 9.51g 0

[root@nagios_client1 ~]# pvs #查物理卷

PV VG Fmt Attr PSize PFree

/dev/sda2 VolGroup lvm2 a-- 9.51g 0

查看主機總線號

[root@nagios_client1 ~]# ls /sys/class/scsi_host/

host0 host1 host2

重新掃描SCSI總線來添加設備

[root@nagios_client1 ~]# echo "- - -" > /sys/class/scsi_host/host0/scan

[root@nagios_client1 ~]# echo "- - -" > /sys/class/scsi_host/host1/scan

[root@nagios_client1 ~]# echo "- - -" > /sys/class/scsi_host/host2/scan


用fdisk /dev/sda 進行分區,將剩余空間創建一個sda3主分區。ID格式為8e,創建好分區後按t 再按 8e 設置


partprobe可以修改kernel中分區表,使kernel重新讀取分區表。

[root@nagios_client1 ~]# rpm -q parted

package parted is not installed

[root@nagios_client1 ~]# yum install parted

[root@nagios_client1 ~]# rpm -q parted

parted-2.1-29.el6.x86_64


使用partprobe重載分區也只能是對不同的硬盤才能及時生效。對於同一塊硬盤,修改過分區信息後,必須重啟系統才能使修改過的分區信息生效。


[root@nagios_client1 ~]# pvcreate /dev/sda3

Physical volume "/dev/sda3" successfully created

[root@nagios_client1 ~]# pvs

PV VG Fmt Attr PSize PFree

/dev/sda2 VolGroup lvm2 a-- 9.51g 0

/dev/sda3 lvm2 --- 40.00g 40.00g #新創建出來的(PV)物理卷


#查看原來VG卷:

[root@nagios_client1 ~]# vgs

VG #PV #LV #SN Attr VSize VFree

VolGroup 1 2 0 wz--n- 9.51g 0

卷組VolGroup添加新的物理卷sda3來增大卷組的容量:

[root@nagios_client1 ~]# vgextend VolGroup /dev/sda3

Volume group "VolGroup" successfully extended


#查看擴展後的VG卷:

[root@nagios_client1 ~]# vgs

VG #PV #LV #SN Attr VSize VFree

VolGroup 2 2 0 wz--n- 49.50g 40.00g

查看邏輯卷的絕對路徑:

[root@nagios_client1 ~]# lvdisplay

--- Logical volume ---

LV Path /dev/VolGroup/lv_root

....



擴展邏輯卷的大小

[root@nagios_client1 ~]# lvextend -l +100%free /dev/VolGroup/lv_root

Size of logical volume VolGroup/lv_root changed from 8.51 GiB (2178 extents) to 48.50 GiB (12417 extents).

Logical volume lv_root successfully resized


最後要使用resizefs2命令重新加載邏輯卷的大小才能生效:

[root@nagios_client1 ~]# resize2fs /dev/VolGroup/lv_root

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required

old desc_blocks = 1, new_desc_blocks = 4

Performing an on-line resize of /dev/VolGroup/lv_root to 12715008 (4k) blocks.

The filesystem on /dev/VolGroup/lv_root is now 12715008 blocks long.



Linux使用LVM邏輯卷擴容