LVM管理

标签：lvm

1、LVRESIZE

对于lvm，如果是扩大某个lv，操作比较简单，但如果是缩小lv，则有一定的风险。我们先要缩小/dev/myvg/lv2文件系统，然后才能缩小lvm，如果在缩小lvm之前忘了缩小文件系统，这时候可以这样来挽救： 
1：不要进行对该分区的任何写入操作，最好是也不read 
2：用lvresize2fs重新扩大该分区，且扩大的容量是刚刚缩小的容量（数字一定要和刚刚的一致哈~）。 
3：缩小文件系统 
4：最后缩小逻辑卷哈。 
5：确认文件系统和逻辑卷大小一致。

[root@rhel5 ~]# umount /mnt/mylv2 
[root@rhel5 ~]# lvresize -L 150M /dev/myvg/mylv2 
  Rounding up size to full physical extent 152.00 MB 
  Extending logical volume mylv2 to 152.00 MB 
  Logical volume mylv2 successfully resized 
[root@rhel5 ~]# e2fsck -f /dev/myvg/mylv2 
e2fsck 1.39 (29-May-2006) 
Pass 1: Checking inodes, blocks, and sizes 
Pass 2: Checking directory structure 
Pass 3: Checking directory connectivity 
Pass 4: Checking reference counts 
Pass 5: Checking group summary information 
/dev/myvg/mylv2: 12/38912 files (8.3% non-contiguous), 10580/155648 blocks 
[root@rhel5 ~]# resize2fs /dev/myvg/mylv2 100M 
resize2fs 1.39 (29-May-2006) 
Resizing the filesystem on /dev/myvg/mylv2 to 102400 (1k) blocks. 
The filesystem on /dev/myvg/mylv2 is now 102400 blocks long.

[root@rhel5 ~]# lvresize -L 100M /dev/myvg/mylv2 
  WARNING: Reducing active logical volume to 100.00 MB 
  THIS MAY DESTROY YOUR DATA (filesystem etc.) 
Do you really want to reduce mylv2? [y/n]: y 
  Reducing logical volume mylv2 to 100.00 MB 
  Logical volume mylv2 successfully resized 
[root@rhel5 ~]# e2fsck -f /dev/myvg/mylv2 
e2fsck 1.39 (29-May-2006) 
Pass 1: Checking inodes, blocks, and sizes 
Pass 2: Checking directory structure 
Pass 3: Checking directory connectivity 
Pass 4: Checking reference counts 
Pass 5: Checking group summary information 
/dev/myvg/mylv2: 12/26624 files (8.3% non-contiguous), 9032/102400 blocks 
[root@rhel5 ~]# mount -t ext3 /dev/myvg/mylv2 /mnt/mylv2 
[root@rhel5 ~]#

本文出自 “Directed By Huboss” 博客，请务必保留此出处http://huboss.blog.51cto.com/9883568/1694682

LVM管理

标签：lvm

原文地址：http://huboss.blog.51cto.com/9883568/1694682