Linux Logical Volumn 快照

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 1. 创建一个logical volumn
lvcreate -L 1g -n testlv testvg
2. 创建一个文件
touch /mnt/a/testfile
echo 'aaaaaaaaaaaaaaaaa' >> /mnt/a/testfile
3. 创建快照
lvcreate -s -L 100M -n testbackup /dev/testvg/testlv
4. 修改testfile
echo 'bbbbbbbbbbbbbbbbbbb' >> testfile
5. 挂载快照logical volumn
mount /dev/testvg/testbackup /mnt/b
6. 检查备份文件
more /mnt/b/testfile
后续：
1. 取消挂载
umount /mnt/b
umount /mnt/a
2. 删除快照logical volumn
lvremove /dev/testvg/testbackup
3. 删除监控logical volumn
lvremove /ev/testvg/testlv
4. 删除volumn group
vgremove testvg

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