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环境:[RHEL4 2.6.9-5.EL] default installation
FAQ:
1 :当# pvmove /dev/hda6
mirror: Required device-mapper target(s) not detected in your kernel
解决方法:
# modprobe dm-mirror
# pvmove /dev/hda6
/dev/hda6: Moved: 46.8%
/dev/hda6: Moved: 89.4%
/dev/hda6: Moved: 100.0%
2 :如果第一次不能产生对应的/DEV/VG0/LGV文件,会报错!
# vgmknodes
运行即可
删除LVM过程
先UMOUNT,然后LV-VG-PV
# lvremove /dev/vg0/lgvv
Do you really want to remove active logical volume "lgvv"? [y/n]: y
Logical volume "lgvv" successfully removed
# lvscan
# # vgremove
Volume group "vg0" successfully removed
# vgdisplay
# pvscan
PV /dev/hda6 lvm2 [188.00 MB]
PV /dev/hda7 lvm2 [188.00 MB]
PV /dev/hda8 lvm2 [188.00 MB]
PV /dev/hda9 lvm2 [92.00 MB]
# pvremove /dev/hda9
Labels on physical volume "/dev/hda9" successfully wiped
# pvscan
PV /dev/hda6 lvm2 [188.00 MB]
PV /dev/hda7 lvm2 [188.00 MB]
PV /dev/hda8 lvm2 [188.00 MB]
Total: 3 [564.00 MB] / in use: 0 [0 ] / in no VG: 3 [564.00 MB]
创建及动态扩展LV
# vgcreate vg0 /dev/hda[6-7]
Volume group "vg0" successfully created
# ls -l /dev/vg0
ls: /dev/vg0: No such file or directory
# lvcreate -L 150m -n lgv vg0
Rounding up size to full physical extent 152.00 MB
Logical volume "lgv" created
# mkfs.ext3 /dev/vg0/lgv
# mount /dev/vg0/lgv /lv
# lvextend -L +100m /dev/vg0/lgv
Extending logical volume lgv to 252.00 MB
Logical volume lgv successfully resized
# ext2online /dev/vg0/lgv
ext2online v1.1.18 - 2001/03/18 for EXT2FS 0.5b
VG扩与减:
增加PV
# vgextend vg0 /dev/hda8
Volume group "vg0" successfully extended
减少PV:
# pvscan
PV /dev/hda6 VG vg0 lvm2 [184.00 MB / 0 free]
PV /dev/hda7 VG vg0 lvm2 [184.00 MB / 116.00 MB free]
PV /dev/hda8 VG vg0 lvm2 [184.00 MB / 184.00 MB free]
Total: 3 [552.00 MB] / in use: 3 [552.00 MB] / in no VG: 0 [0 ]
# pvmove /dev/hda6 第一步:移动数据到LV中其余的PV中去
/dev/hda6: Moved: 39.1%
/dev/hda6: Moved: 78.3%
/dev/hda6: Moved: 100.0%
# pvscan
PV /dev/hda6 VG vg0 lvm2 [184.00 MB / 184.00 MB free]
PV /dev/hda7 VG vg0 lvm2 [184.00 MB / 116.00 MB free]
PV /dev/hda8 VG vg0 lvm2 [184.00 MB / 0 free]
Total: 3 [552.00 MB] / in use: 3 [552.00 MB] / in no VG: 0 [0 ]
接着:
# vgreduce vg0 /dev/hda6
Removed "/dev/hda6" from volume group "vg0"
# pvscan
PV /dev/hda7 VG vg0 lvm2 [184.00 MB / 116.00 MB free]
PV /dev/hda8 VG vg0 lvm2 [184.00 MB / 0 free]
PV /dev/hda6 lvm2 [184.00 MB]
Total: 3 [552.00 MB] / in use: 2 [368.00 MB] / in no VG: 1 [184.00 MB]
创建LVM流程
1、首先,我们要先创建新磁盘分区
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#fdisk /dev/had
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创建2个500MB分区(hda10,hda11),然后在fdisk命令下输入t,
选择刚创建好的分区,输入8e,将刚创建好的2个分区转换为8e格式。
输入w保存退出
2、激活刚创建好的分区
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#partprobe
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3、创建成pv格式
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#pvcreate /dev/had{10,11}
#pvdisplay 查看pv
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4、将分区加载到vg卷组,vg0是卷组名称,vg0卷组总空间是1000MB
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#vgcreate vg0 /dev/had{10,11}
#vgdisplay 查看vg卷组
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5、创建lv分区800M是分区大小,lv0是lv分区名称,vg0是加载到卷组名称,
此时创建了一个800MB的lvm分区,vg0卷组还剩余200MB的空间
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#lvcreate –L 800M –nlv0 vg0
#lvdisplay 查看lv分区
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6、将lv分区格式化成ext3格式
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#mkfs.ext3 /dev/vg0/lv0
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7、将LVM分区mount到目录上,并修改fstab表
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#mount /dev/vg0/lv0 /lvm
#vi /etc/fstab
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8、扩展(lv)刚才我们创建了800mb的lvm分区,当要对分区进行扩展应
如下操作:
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#lvextend –L+100M /dev/vg0/lv0
#ext2online /dev/vg0/lv0 动态扩展
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此时,我们已经向lv0分区增加了100MB空间,vg0卷组还剩余100MB空间,
如果当我们认为空间还是不足,需要扩充,而vg0卷组的空间也不足时,我们
就需要对vg0卷组进行扩展,然后再对lv分区进行扩展
1、创建1个500MB分区(hda12),然后在fdisk命令下输入t,选择刚创建
好的分区,输入8e,将刚创建好的分区转换为8e格式。输入w保存退出
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#fdisk /dev/had
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2、激活刚创建好的分区
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#partprobe
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3、创建成pv格式
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#pvcreate /dev/had12
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4、将hda12添加到vg0卷组,此时vg0卷组的总空间大小为1500MB
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#vgextend vg0 /dev/hda12
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5、对lv0分区进行动态扩展,增加500M空间
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#lvextend –L+500M /dev/vg0/lv0
#ext2online /dev/vg0/lv0
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此时我们创建 LVM分区大小总空间应为800M+100M+500M=1400M
本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u/4929/showart_119984.html |
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