# 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。