一直都说lvm可以在线增加空间，一直都没有试过
下面小试一下：
1.增加硬盘
2.创建pv
3.添加pv到vg
4.扩展lv
1.增加硬盘
该干嘛干嘛
添加后需要重启（有知道不用重启的办法吗）
--这个是新添加的硬盘 [root@localhost ~]# fdisk -l /dev/sdb disk /dev/sdb: 5368 mb, 5368709120 bytes 255 heads, 63 sectors/track, 652 cylinders units = cylinders of 16065 * 512 = 8225280 bytes disk /dev/sdb doesn't contain a valid partition table
2.创建pv
--命令很简单
--命令很简单
[root@localhost ~]# pvcreate /dev/sdb
physical volume "/dev/sdb" successfully created
--可以看到新的pv了
[root@localhost ~]# pvdisplay
/dev/hdc: open failed: no medium found
--- physical volume ---
pv name /dev/sda2
vg name volgroup00
pv size 9.90 gb / not usable 22.76 mb
allocatable yes (but full)
pe size (kbyte) 32768
total pe 316
free pe 0
allocated pe 316
pv uuid n5fs6m-jbih-n9vu-pbtd-iocv-bbte-buenzo
"/dev/sdb" is a new physical volume of "5.00 gb"
--- new physical volume ---
pv name /dev/sdb
vg name
pv size 5.00 gb
allocatable no
pe size (kbyte) 0
total pe 0
free pe 0
allocated pe 0
pv uuid tds3mn-3on3-ehbl-cohr-7hr3-8608-jillxg
3.添加pv到vg
--指定对应的vg和pv [root@localhost ~]# vgextend volgroup00 /dev/sdb volume group "volgroup00" successfully extended --看到新的5g添加到vg里面了，状态是没有分配 [root@localhost ~]# vgdisplay --- volume group --- vg name volgroup00 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 14.84 gb pe size 32.00 mb total pe 475 alloc pe / size 316 / 9.88 gb free pe / size 159 / 4.97 gb vg uuid x1uypd-qbge-2yqv-t1cb-igiz-e4lb-fghf1w
4.扩展lv
--先添加2g练手
[root@localhost ~]# lvextend -l +2g /dev/volgroup00/logvol00
extending logical volume logvol00 to 10.88 gb
logical volume logvol00 successfully resized
--成功后还未看到新的空间
[root@localhost ~]# df -m
filesystem 1m-blocks used available use% mounted on
/dev/mapper/volgroup00-logvol00
8804 7362 988 89% /
--需要手动刷新
[root@localhost ~]# resize2fs /dev/volgroup00/logvol00
resize2fs 1.39 (29-may-2006)
filesystem at /dev/volgroup00/logvol00 is mounted on /; on-line resizing required
performing an on-line resize of /dev/volgroup00/logvol00 to 2850816 (4k) blocks.
the filesystem on /dev/volgroup00/logvol00 is now 2850816 blocks long.
--现在就完成了
[root@localhost ~]# df -m
filesystem 1m-blocks used available use% mounted on
/dev/mapper/volgroup00-logvol00
10788 7365 2867 72% /
若需要先缩小则使用以下命令：
lvreduce -l -20g /dev/mapper/vg_mysvr-lv_home
resize2fs /dev/mapper/vg_my-lv_home
lvextend -l +20g /dev/mapper/vg_mysvr-lv_root
resize2fs /dev/mapper/vg_mysvr-lv_root
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