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案例需求
将 lv1 逻辑卷由原来的 3G 缩小为 2G
案例思路
1、卸载逻辑卷
2、扫描逻辑卷
3、裁剪率 lv1 文件系统
4、裁剪逻辑卷 lv1
5、挂载使用
案例实现
ext 分区逻辑卷裁剪
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| 文件系统 容量 已用 可用 已用 % 挂载点 | |
| /dev/mapper/vg1-lv1 2.0G 9.0M 1.8G 1% /lv1 |
xfs 分区逻辑卷裁剪
案例思路：
1、将 lv2 的文件系统格式化为 xfs
2、将 /dev/vg1/lv2 挂载到 /lv2
3、在 /lv2 中建立一个文件，写入内容
4、备份数据
5、卸载分区并裁剪逻辑卷
6、格式化裁剪后的逻辑卷
7、导入数据
| 1) 备份数据命令 | |
| xfsdump | |
| 2）备份数据 | |
| [root@zutuanxue /]# xfsdump -f /root/lv2.img /lv2 | |
| # 挂载点目录后面不要加 "/" | |
| xfsdump: using file dump (drive_simple) strategy | |
| xfsdump: version 3.1.8 (dump format 3.0) - type ^C for status and control | |
| ============================= dump label dialog ============================== | |
| please enter label for this dump session (timeout in 300 sec) | |
| -> lv2 | |
| session label entered: "lv2" | |
| --------------------------------- end dialog --------------------------------- | |
| xfsdump: level 0 dump of localhost.localdomain:/lv2 | |
| xfsdump: dump date: Tue Dec 10 06:33:44 2019 | |
| xfsdump: session id: 15936371-b967-4c2c-8995-49eb702792fe | |
| xfsdump: session label: "lv2" | |
| xfsdump: ino map phase 1: constructing initial dump list | |
| xfsdump: ino map phase 2: skipping (no pruning necessary) | |
| xfsdump: ino map phase 3: skipping (only one dump stream) | |
| xfsdump: ino map construction complete | |
| xfsdump: estimated dump size: 20800 bytes | |
| ============================= media label dialog ============================= | |
| please enter label for media in drive 0 (timeout in 300 sec) | |
| -> lv2 | |
| media label entered: "lv2" | |
| --------------------------------- end dialog --------------------------------- | |
| xfsdump: creating dump session media file 0 (media 0, file 0) | |
| xfsdump: dumping ino map | |
| xfsdump: dumping directories | |
| xfsdump: dumping non-directory files | |
| xfsdump: ending media file | |
| xfsdump: media file size 21016 bytes | |
| xfsdump: dump size (non-dir files) : 0 bytes | |
| xfsdump: dump complete: 14 seconds elapsed | |
| xfsdump: Dump Summary: | |
| xfsdump: stream 0 /root/lv2.img OK (success) | |
| xfsdump: Dump Status: SUCCESS | |
| 3) 裁剪 | |
| [root@zutuanxue ~]# umount /lv2 | |
| [root@zutuanxue ~]# lvreduce /dev/vg1/lv2 -L 100M | |
| WARNING: Reducing active logical volume to 2.00 GiB. | |
| THIS MAY DESTROY YOUR DATA (filesystem etc.) | |
| Do you really want to reduce vg01/lv01? [y/n]: y | |
| Size of logical volume vg01/lv01 changed from 7.00 GiB (1792 extents) to 2.00 GiB (512 extents). | |
| Logical volume vg01/lv01 successfully resized. | |
| 4）格式化 | |
| [root@zutuanxue ~]# mkfs.xfs -f /dev/vg1/lv2 | |
| [root@zutuanxue ~]# mount /dev/vg1/lv2 /lv2 | |
| 5）恢复数据 -f source | |
| [root@zutuanxue ~]# xfsrestore -f /root/lv2.img /lv2 | |
| . | |
| . | |
| . | |
| xfsrestore: Restore Status: SUCCESS | |
| root@zutuanxue ~]# df -h | |
| 文件系统 容量 已用 可用 已用 % 挂载点 | |
| /dev/mapper/vg1-lv2 95M 6.0M 89M 7% /lv2 | |
| [root@zutuanxue ~]# cat /lv2/filea | |
| hahaha |
正文完
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