因生產(chǎn)需要對/data目錄進行擴容，由原來的90G擴容到190G，增加100G的空間.
生產(chǎn)環(huán)境是RHEL服務(wù)器，后端通過光纖交換機連的EMC存儲。首先在EMC存儲上把空閑的硬盤做RAID，劃分LUN，映射到生產(chǎn)RHEL服務(wù)器。
（注意：此種擴容的前提是分區(qū)必須采用LVM格式完成）
一、原服務(wù)器磁盤信息
#df -H
/dev/datavg/lv_data
90G 81G 9G 90% /data
#lvdisplay
--- Logical volume ---
LV Name /dev/datavg/lv_data
VG Name datavg
LV UUID Sgpcu1-7Xhr-0gwH-qjJ6-QwBB-k2KA-9DJvFt
LV Write Access read/write
LV Status available
# open 1
LV Size 90.00 GB
Current LE 24882
Segments 10
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
二、重啟服務(wù)器，識別到EMC上新加的LUN后，在服務(wù)器端進行擴容datavg卷
#powerrmt display dev=all
Pseudo name=emcpowery
CLARiiON ID=CKM00110900942 [SG_DRAGON]
Logical device ID=6006016003602C00F0154D04917BE011 [LUN 211]
state=alive; policy=CLAROpt; priority=0; queued-IOs=0;
Owner: default=SP A, current=SP A Array failover mode: 1
==============================================================================
--------------- Host --------------- - Stor - -- I/O Path -- -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==============================================================================
7 qla2xxx sdan SP B0 active alive 0 0
5 qla2xxx sdas SP B1 active alive 0 0
7 qla2xxx sdbo SP A1 active alive 0 0
5 qla2xxx sdq SP A0 active alive 0 0
#powerrmt config
#powerrmt save
三、步驟：
Fdisk /dev/emcpowery1 然后按n添加一個新分區(qū);
輸入p創(chuàng)建主分區(qū),兩次回車將空間全部分給這個分區(qū);
輸入t轉(zhuǎn)換分區(qū)類型;輸入8e表示轉(zhuǎn)換為linux lvm分區(qū);
輸入w寫入保存退出。
創(chuàng)建PV
[root@linuxas /]# pvcreate /dev/ emcpowery1
加入到已有的邏輯卷組中
[root@linuxas /]# vgextend datavg /dev/ emcpowery1
為LVM擴容
[root@linuxas /]# lvextend -L +100G /dev/datavg/lv_data
檢查LVM設(shè)備對應(yīng)inode和block之間的關(guān)系
[root@linuxas /]# e2fsck –f /dev/datavg/lv_data
使增加的容量生效
[root@linuxas /]# resize2fs /dev/datavg/lv_data
四、驗證
#df -H
/dev/datavg/lv_data
190G 81G 109G 43% /data
#lvdisplay
--- Logical volume ---
LV Name /dev/datavg/lv_data
VG Name datavg
LV UUID Sgpcu1-7Xhr-0gwH-qjJ6-QwBB-k2KA-9DJvFt
LV Write Access read/write
LV Status available
# open 1
LV Size 190.00 GB
Current LE 39882
Segments 10
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
