ls /dev/sda >/dev/null 2>&1;
if [ $? = 0 ]; then
/sbin/pvcreate /dev/sda
/sbin/vgcreate domuvg /dev/sda
/sbin/lvcreate -L 1G -n swap domuvg
/sbin/mkswap /dev/domuvg/swap
/sbin/swapon /dev/domuvg/swap
echo "/dev/domuvg/swap swap swap defaults 0 0" >> /etc/fstab
mkdir -p /alidata
/sbin/lvcreate -l +100%FREE -n alidata domuvg
/sbin/mkfs.ext4 /dev/domuvg/alidata
if [ `ls -r /alidata |wc -l` = 0 ]; then
/bin/mount /dev/domuvg/alidata /alidata
echo "/dev/domuvg/alidata /alidata ext4 defaults 0 0" >> /etc/fstab
fi
fi
使用此脚本对/dev/sda做LVM，并且分成2个分区。
场景：sda做了lvm，现在容量不够，需要扩容，新添加了sdb，把sdb的容量扩容到sda里面，增加sda的容量。
1、查看现在物理卷情况
[root@localhost ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda
VG Name domuvg
PV Size 8.00 GiB / not usable 4.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 2047
Free PE 0
Allocated PE 2047
PV UUID v8b8aP-6Lq6-I3gR-f1p6-89nu-Bk67-tPA5hh
2、针对sdb建立物理卷
[root@localhost ~]# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created
3、查看现在物理卷情况
[root@localhost ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda
VG Name domuvg
PV Size 8.00 GiB / not usable 4.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 2047
Free PE 0
Allocated PE 2047
PV UUID v8b8aP-6Lq6-I3gR-f1p6-89nu-Bk67-tPA5hh
"/dev/sdb" is a new physical volume of "5.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb
VG Name
PV Size 5.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID yOWwty-2dfz-5DN4-aSgH-VijX-1LAT-fb8irp
4、添加sdb到现在的卷组中
[root@localhost ~]# vgextend domuvg /dev/sdb
Volume group "domuvg" successfully extended
5、查看现在物理卷情况
[root@localhost ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda
VG Name domuvg
PV Size 8.00 GiB / not usable 4.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 2047
Free PE 0
Allocated PE 2047
PV UUID v8b8aP-6Lq6-I3gR-f1p6-89nu-Bk67-tPA5hh
--- Physical volume ---
PV Name /dev/sdb
VG Name domuvg
PV Size 5.00 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 1279
Free PE 1279
Allocated PE 0
PV UUID yOWwty-2dfz-5DN4-aSgH-VijX-1LAT-fb8irp
6、查看卷组的情况
[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name domuvg
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 12.99 GiB
PE Size 4.00 MiB
Total PE 3326
Alloc PE / Size 2047 / 8.00 GiB
Free PE / Size 1279 / 5.00 GiB
VG UUID VJ4tsH-IFB3-Ft1O-Rnxc-nFfw-hDNE-ggB0Az
7、扩展lv的容量
[root@localhost ~]# lvextend -l +100%FREE /dev/domuvg/alidata #全部扩容到/dev/domuvg/alidata此逻辑卷上
Size of logical volume domuvg/alidata changed from 7.00 GiB (1791 extents) to 11.99 GiB (3070 extents).
Logical volume alidata successfully resized
8、查看容量
[root@localhost ~]# df -Ph
Filesystem Size Used Avail Use% Mounted on
/dev/sdc2 7.3G 1.1G 5.9G 15% /
tmpfs 939M 0 939M 0% /dev/shm
/dev/mapper/domuvg-alidata 6.8G 16M 6.4G 1% /alidata #大小没有扩容
9、使用resize2fs扩容
[root@localhost ~]# resize2fs /dev/domuvg/alidata
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/domuvg/alidata is mounted on /alidata; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/domuvg/alidata to 3143680 (4k) blocks.
The filesystem on /dev/domuvg/alidata is now 3143680 blocks long.
[root@localhost ~]# df -Ph
Filesystem Size Used Avail Use% Mounted on
/dev/sdc2 7.3G 1.1G 5.9G 15% /
tmpfs 939M 0 939M 0% /dev/shm
/dev/mapper/domuvg-alidata 12G 18M 12G 1% /alidata
由最初的8G扩容到了12G，增加了5G。
本文转自 freeterman 51CTO博客，原文链接：http://blog.51cto.com/myunix/1700869，如需转载请自行联系原作者
