测试机各种报错，创建个目录都报错，df看了一下，发现VolGroup-lv_root 100%，虚拟磁盘满了，怎么办呢
1，解决过程
# df -h //查看分区# umount /home //取消挂载# e2fsck -f /dev/mapper/VolGroup-lv_home //分区检测# resize2fs -p /dev/mapper/VolGroup-lv_home 100G //将lv_home虚拟分区设为100G# mount /home //挂载home# df -h //查看分区# lvreduce -L 100G /dev/mapper/VolGroup-lv_home //释放空间# vgdisplay //查看可用空间大小# lvextend -L +311.47G /dev/mapper/VolGroup-lv_root //扩展lv_root虚拟分区# resize2fs -p /dev/mapper/VolGroup-lv_root //lv_root重设分区大小
LVM（逻辑磁盘管理），灵活性很高.
2，，详细解决过程
[root@localhost ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root 50G 47G 16M 100% / //lv_root满了tmpfs 1.9G 72K 1.9G 1% /dev/shm/dev/sda1 485M 40M 420M 9% /boot/dev/mapper/VolGroup-lv_home 406G 19G 366G 5% /home //lv_home空间很多
[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100Gresize2fs 1.41.12 (17-May-2010)Filesystem at /dev/mapper/VolGroup-lv_home is mounted on /home; on-line resizing requiredOn-line shrinking from 107865088 to 65536000 not supported. //先umount才能resize2fs
[root@localhost ~]# umount /home //umount home目录
[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100Gresize2fs 1.41.12 (17-May-2010)请先运行 ‘e2fsck -f /dev/mapper/VolGroup-lv_home’. //提示要先进行磁盘检测
[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_homee2fsck 1.41.12 (17-May-2010)第一步: 检查inode,块,和大小第二步: 检查目录结构第3步: 检查目录连接性Pass 4: Checking reference counts第5步: 检查簇概要信息/dev/mapper/VolGroup-lv_home: 1459/16384000 files (4.0% non-contiguous), 5914204/65536000 blocks
[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G //重定大小resize2fs 1.41.12 (17-May-2010)Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 26214400 (4k) blocks.Begin pass 2 (max = 32768)正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXBegin pass 3 (max = 2000)正在扫描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXThe filesystem on /dev/mapper/VolGroup-lv_home is now 26214400 blocks long.
[root@localhost ~]# mount /home/
[root@localhost ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root 50G 47G 16M 100% /tmpfs 1.9G 72K 1.9G 1% /dev/shm/dev/sda1 485M 40M 420M 9% /boot/dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home
[root@localhost ~]# lvreduce -L 100G /dev/mapper/VolGroup-lv_home //释放空间WARNING: Reducing active and open logical volume to 100.00 GiBTHIS MAY DESTROY YOUR DATA (filesystem etc.)Do you really want to reduce lv_home? [y/n]: yReducing logical volume lv_home to 100.00 GiBLogical volume lv_home successfully resized
[root@localhost ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root 50G 47G 16M 100% /tmpfs 1.9G 72K 1.9G 1% /dev/shm/dev/sda1 485M 40M 420M 9% /boot/dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home
[root@localhost ~]# vgdisplay— Volume group —VG Name VolGroupSystem IDFormat lvm2Metadata Areas 1Metadata Sequence No 5VG Access read/writeVG Status resizableMAX LV 0Cur LV 3Open LV 3Max PV 0Cur PV 1Act PV 1VG Size 465.27 GiBPE Size 4.00 MiBTotal PE 119109Alloc PE / Size 39372 / 153.80 GiBFree PE / Size 79737 / 311.47 GiB //空闲空间VG UUID Vt2V4t-Byxs-tQqk-cY0h-IDE3-pabX-LUfkRS
[root@localhost ~]# lvextend -L +311.47G /dev/mapper/VolGroup-lv_root //空闲空间加入到lv_rootRounding size to boundary between physical extents: 311.47 GiBExtending logical volume lv_root to 361.47 GiBLogical volume lv_root successfully resized
[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_rootresize2fs 1.41.12 (17-May-2010)Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing requiredold desc_blocks = 4, new_desc_blocks = 23 //这儿要耐心等待，扩大越多，时间越长Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 94757888 (4k) blocks.The filesystem on /dev/mapper/VolGroup-lv_root is now 94757888 blocks long.
[root@localhost openfire]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root 356G 48G 308G 14% /tmpfs 1.9G 72K 1.9G 1% /dev/shm/dev/sda1 485M 40M 420M 9% /boot/dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home
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