在linux下如何把一个lvm的文件系统/home减到1G。比aix下麻烦，aix下直接把文件系统缩到某个值，对应的lv自动就减少了，不像linux要先缩小文件系统，再缩小lv。
suse1:~ # df -m
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/mapper/system-root
5040 2998 1787 63% /
udev 125 1 125 1% /dev
/dev/sda1 69 18 48 28% /boot
/dev/mapper/system-home
6493 146 6018 3% /home
resize2fs以4k block为单位，1G=262144 * 4K
步骤如下
umount /home
e2fsck -f /dev/mapper/system-home
resize2fs /dev/mapper/system-home 262144
lvchange -an /dev/system/home
lvreduce -L1G /dev/system/home
lvchange -ay /dev/system/home
mount /home
详细输出如下
suse1:~ # resize2fs /dev/mapper/system-home 262144
resize2fs 1.40.8 (13-Mar-2008)
Please run 'e2fsck -f /dev/mapper/system-home' first.
suse1:~ # e2fsck -f /dev/mapper/system-home
e2fsck 1.40.8 (13-Mar-2008)
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/mapper/system-home: 663/130048 files (0.5% non-contiguous), 44176/524288 blocks
suse1:~ # resize2fs /dev/mapper/system-home 262144
resize2fs 1.40.8 (13-Mar-2008)
Resizing the filesystem on /dev/mapper/system-home to 262144 (4k) blocks.
The filesystem on /dev/mapper/system-home is now 262144 blocks long.
suse1:~ # lvchange -an /dev/system/home
suse1:~ # lvreduce -L1G /dev/system/home
Reducing logical volume home to 1.00 GB
Logical volume home successfully resized
suse1:~ # mount /home
mount: special device /dev/system/home does not exist
suse1:~ # lvchange -ay /dev/system/home
suse1:~ # mount /home
suse1:~ # vgdisplay
--- Volume group ---
VG Name system
System ID
Format lvm2
Metadata Areas 1
Linux环境进程间通信（五）:
共享内存（上）
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