lv resize

# lvreduce -L -400G /dev/vg_atalinux001/lv_home

# resize2fs   /dev/vg_atalinux001/lv_home

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/vg_atalinux001/lv_home is mounted on /home; on-line resizing required

On-line shrinking from 107852800 to 2995200 not supported.

# umount /home

# resize2fs   /dev/vg_atalinux001/lv_home

resize2fs 1.41.12 (17-May-2010)

Please run 'e2fsck -f /dev/vg_atalinux001/lv_home' first.

# e2fsck -f /dev/vg_atalinux001/lv_home

一通回车之后就挂了...

# mount -a

mount: wrong fs type, bad option, bad superblock on /dev/mapper/vg_atalinux001-lv_home,

       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try

       dmesg | tail  or so

# tail /var/log/messages 

Dec 12 11:09:54 ata-linux-001 kernel: dm-2: rw=1217, want=428081160, limit=23961600

Dec 12 11:09:54 ata-linux-001 kernel: Buffer I/O error on device dm-2, logical block 53510144

Dec 12 11:09:54 ata-linux-001 kernel: lost page write due to I/O error on dm-2

Dec 12 11:09:54 ata-linux-001 kernel: JBD2: I/O error detected when updating journal superblock for dm-2-8.

Dec 12 11:09:54 ata-linux-001 kernel: attempt to access beyond end of device

Dec 12 11:09:54 ata-linux-001 kernel: dm-2: rw=1217, want=428081160, limit=23961600

Dec 12 11:09:54 ata-linux-001 kernel: Buffer I/O error on device dm-2, logical block 53510144

Dec 12 11:09:54 ata-linux-001 kernel: lost page write due to I/O error on dm-2

Dec 12 11:09:54 ata-linux-001 kernel: JBD2: I/O error detected when updating journal superblock for dm-2-8.

Dec 12 11:14:19 ata-linux-001 kernel: EXT4-fs (dm-2): bad geometry: block count 107852800 exceeds size of device (2995200 blocks)

# mkfs.ext4 /dev/vg_atalinux001/lv_home

之后好了。

 lvreduce 需谨慎使用呀，使用前把数据要全拷贝出来才安全。