眾所周知，linux lvm 擴大lv是先擴大lv，然后再擴大文件系統，所以有的人就認為縮小lv也是先縮小lv,再縮小文件系統，當然博主剛開始也那么認為，導致lvresize 以后，lv的大小小于文件系統大小而無法掛載，以下分享下解決辦法。

案例：

縮小/opt from 8.46G to 4G.

HostA:~ # lvresize -L 4G /dev/vg00/lv_opt
? WARNING: Reducing active logical volume to 4.00 GB
? THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_opt? [y/n]: y
? Reducing logical volume lv_opt to 4.00 GB
? Logical volume lv_opt successfully resized
HostA:~ # lvs
lv_opt??? vg00 -wi-a- 4.00G
?

HostA:~ # e2fsck -f /dev/vg00/lv_opt
e2fsck 1.41.9 (22-Aug-2009)
Error reading block 1049100 (Invalid argument).? Ignore error<y>? no

Error reading block 1050125 (Invalid argument).? Ignore error<y>? no

Error reading block 1049100 (Invalid argument).? Ignore error<y>? no

Error reading block 1050125 (Invalid argument).? Ignore error<y>? no

Superblock has an invalid journal (inode 8).
Clear<y>? yes

*** ext3 journal has been deleted - filesystem is now ext2 only ***

The filesystem size (according to the superblock) is 2217984 blocks
The physical size of the device is 1048576 blocks
Either the superblock or the partition table is likely to be corrupt!
Abort<y>? no

Pass 1: Checking inodes, blocks, and sizes
Journal inode is not in use, but contains data.? Clear<y>? yes

Error reading block 1048578 (Invalid argument) while getting next inode from scan.? Ignore error<y>? yes

HostA:~ # resize2fs /dev/vg00/lv_opt
resize2fs 1.41.9 (22-Aug-2009)
Please run 'e2fsck -f /dev/vg00/lv_opt' first.

會發生以上文件系統大于lv大小導致無法通過e2fsck

網上找了很多方法如何修復系統，其實方法很簡單，只要先把lv擴大至原來大小，再重新用正確的方法縮小lv即可

HostA:~ # lvresize -L 8.46G /dev/vg00/lv_opt
HostA:~ # e2fsck -f /dev/vg00/lv_opt
e2fsck 1.41.9 (22-Aug-2009)
Pass 1: Checking inodes, blocks, and sizes
Inode 8, i_blocks is 0, should be 262408.? Fix<y>? yes

Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

/dev/vg00/lv_opt: ***** FILE SYSTEM WAS MODIFIED *****
/dev/vg00/lv_opt: 12703/554880 files (0.3% non-contiguous), 246796/2217984 blocks
HostA:~ # resize2fs /dev/vg00/lv_opt 4G
resize2fs 1.41.9 (22-Aug-2009)
Resizing the filesystem on /dev/vg00/lv_opt to 1048576 (4k) blocks.
The filesystem on /dev/vg00/lv_opt is now 1048576 blocks long.
HostA:~ # lvresize -L 4G /dev/vg00/lv_opt
? WARNING: Reducing active logical volume to 4.00 GB
? THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_opt? [y/n]: y
? Reducing logical volume lv_opt to 4.00 GB
? Logical volume lv_opt successfully resized
HostA:~ # mount /opt/
HostA:~ # df -h /opt/
Filesystem??????????? Size? Used Avail Use% Mounted on
/dev/mapper/vg00-lv_opt
????????????????????? 4.0G? 826M? 3.0G? 22% /opt
HostA:~ #

轉載于:https://blog.51cto.com/loofeer/792739

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