一、查看文件系统
[root@master ~]# df -h
Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_master-lv_root 50G 1.2G 46G 3% / tmpfs 16G 0 16G 0% /dev/shm /dev/sda1 485M 39M 421M 9% /boot /dev/mapper/vg_master-lv_home 231G 188M 219G 1% /home
由于我的HDFS存储目录实在根目录”/”下，因此实际这个节点上的存储空间只有50G，但是可以看出/dev/mapper/vg_master-lv_home下的空间有231G，大量空间没有被使用，因此我的目标是从中你抽取出223G的空间给根目录
二、卸载目录
[root@master ~]# umount /home
三、重新分配存储容量
[root@master ~]# e2fsck -f /dev/mapper/vg_master-lv_home e2fsck 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/vg_master-lv_home: 11/15327232 files (0.0% non-contiguous), 1009843/61280256 blocks [root@master ~]# resize2fs -p /dev/mapper/vg_master-lv_home 10G resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/vg_master-lv_home to 2621440 (4k) blocks. Begin pass 2 (max = 32768) 正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 3 (max = 1871) 正在扫描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX The filesystem on /dev/mapper/vg_master-lv_home is now 2621440 blocks long. [root@master ~]#
四、重新挂载目录
[root@master ~]# mount /home
五、释放存储空间
将抽出223G空间释放以便重新分配
[root@master ~]# lvreduce -L 10G /dev/mapper/vg_master-lv_home WARNING: Reducing active and open logical volume to 10.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce lv_home? [y/n]: y Reducing logical volume lv_home to 10.00 GiB Logical volume lv_home successfully resized [root@master ~]#
查看空闲的存储空间
[root@master ~]# vgdisplay --- Volume group --- VG Name vg_master System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 5 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 299.51 GiB PE Size 4.00 MiB Total PE 76674 Alloc PE / Size 19390 / 75.74 GiB Free PE / Size 57284 / 223.77 GiB VG UUID iF3Sxg-QDyY-2zkm-Tg6C-cuF5-UcRc-f7tCAm [root@master ~]#
六、为目标磁盘增加存储
[root@master ~]# lvextend -L +223G /dev/mapper/vg_master-lv_root Extending logical volume lv_root to 273.00 GiB Logical volume lv_root successfully resized [root@master ~]# resize2fs -p /dev/mapper/vg_master-lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/vg_master-lv_root is mounted on /; on-line resizing required old desc_blocks = 4, new_desc_blocks = 18 Performing an on-line resize of /dev/mapper/vg_master-lv_root to 71565312 (4k) blocks. The filesystem on /dev/mapper/vg_master-lv_root is now 71565312 blocks long. [root@master ~]#
七、查看文件存储大小
[root@master ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_master-lv_root 269G 1.2G 254G 1% / tmpfs 16G 0 16G 0% /dev/shm /dev/sda1 485M 39M 421M 9% /boot /dev/mapper/vg_master-lv_home 9.9G 164M 9.2G 2% /home [root@master ~]#
1. 查看文件系统
|
[root@master ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_master-lv_root 50G 1.2G 46G 3% / tmpfs 16G 0 16G 0% /dev/shm /dev/sda1 485M 39M 421M 9% /boot /dev/mapper/vg_master-lv_home 231G 188M 219G 1% /home [root@master ~]# |
由于我的HDFS存储目录实在根目录”/”下，因此实际这个节点上的存储空间只有50G，但是可以看出/dev/mapper/vg_master-lv_home下的空间有231G，大量空间没有被使用，因此我的目标是从中你抽取出223G的空间给根目录
2. 卸载目录
|
[root@master ~]# umount /home |
3. 重新分配存储容量
|
[root@master ~]# e2fsck -f /dev/mapper/vg_master-lv_home e2fsck 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/vg_master-lv_home: 11/15327232 files (0.0% non-contiguous), 1009843/61280256 blocks [root@master ~]# resize2fs -p /dev/mapper/vg_master-lv_home 10G resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/vg_master-lv_home to 2621440 (4k) blocks. Begin pass 2 (max = 32768) 正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 3 (max = 1871) 正在扫描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX The filesystem on /dev/mapper/vg_master-lv_home is now 2621440 blocks long.
[root@master ~]# |
4. 重新挂载目录
|
[root@master ~]# mount /home |
5. 释放存储空间
将抽出223G空间释放以便重新分配
|
[root@master ~]# lvreduce -L 10G /dev/mapper/vg_master-lv_home WARNING: Reducing active and open logical volume to 10.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce lv_home? [y/n]: y Reducing logical volume lv_home to 10.00 GiB Logical volume lv_home successfully resized [root@master ~]# |
查看空闲的存储空间
|
[root@master ~]# vgdisplay --- Volume group --- VG Name vg_master System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 5 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 299.51 GiB PE Size 4.00 MiB Total PE 76674 Alloc PE / Size 19390 / 75.74 GiB Free PE / Size 57284 / 223.77 GiB VG UUID iF3Sxg-QDyY-2zkm-Tg6C-cuF5-UcRc-f7tCAm
[root@master ~]# |
6. 为目标磁盘增加存储
|
[root@master ~]# lvextend -L +223G /dev/mapper/vg_master-lv_root Extending logical volume lv_root to 273.00 GiB Logical volume lv_root successfully resized [root@master ~]# resize2fs -p /dev/mapper/vg_master-lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/vg_master-lv_root is mounted on /; on-line resizing required old desc_blocks = 4, new_desc_blocks = 18 Performing an on-line resize of /dev/mapper/vg_master-lv_root to 71565312 (4k) blocks. The filesystem on /dev/mapper/vg_master-lv_root is now 71565312 blocks long.
[root@master ~]# |
查看文件存储大小
|
[root@master ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_master-lv_root 269G 1.2G 254G 1% / tmpfs 16G 0 16G 0% /dev/shm /dev/sda1 485M 39M 421M 9% /boot /dev/mapper/vg_master-lv_home 9.9G 164M 9.2G 2% /home [root@master ~]# |