我已经在VirtualBox中创build了一个ubuntu VM实例。 一开始我只分配了7GB的存储空间，现在虚拟机已经空间不足了。
首先，我通过VirtualBox前端向VM添加了另一个8GB（/ dev / sdb）。 然后我设置了以下分区：
$ sudo fdisk -l /dev/sdb Disk /dev/sdb: 8589 MB, 8589934592 bytes 40 heads, 1 sectors/track, 419430 cylinders, total 16777216 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x076b5690 Device Boot Start End Blocks Id System /dev/sdb1 2048 16777215 8387584 5 Extended /dev/sdb5 4096 16777215 8386560 8e Linux LVM 然后我运行以下命令展开VG。
sudo pvcreate /dev/sdb5 sudo vgextend ubuntudevbox2 /dev/sdb5 sudo lvextend 100% /dev/ubuntudevbox2/root lvextend --help sudo lvextend -l 100%FREE /dev/ubuntudevbox2/root sudo lvextend -r -l 100%FREE /dev/ubuntudevbox2/root sudo resize2fs /dev/mapper/ubuntudevbox2-root
我预计/的大小将扩大到16Gb。 然而DF报告
$ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/ubuntudevbox2-root 8.0G 6.9G 680M 92% /
根挂载仅增加到8G
这是VG的信息
$ sudo vgdisplay ubuntudevbox2 [sudo] password for antkong: --- Volume group --- VG Name ubuntudevbox2 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 5 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 2 Act PV 2 VG Size 15.75 GiB PE Size 4.00 MiB Total PE 4033 Alloc PE / Size 2182 / 8.52 GiB Free PE / Size 1851 / 7.23 GiB VG UUID ZV6VAi-qkxC-KnKz-1LHg-nfLB-afSI-mVpIPv
为什么我没有获得完整的8Gb额外空间？
附加信息1：在使用fdisk添加新分区后，我已经运行了mkfs -t ext5 /dev/sdb5 。 它能导致失败吗？
附加信息2：
$ uname -a Linux ubuntudevbox2 3.5.0-27-generic #46-Ubuntu SMP Mon Mar 25 19:58:17 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
lvdisplay输出：
$ sudo lvdisplay
--- Logical volume --- LV Path /dev/ubuntudevbox2/root LV Name root VG Name ubuntudevbox2 LV UUID V1Qq0f-qKJR-UTf5-4tjM-ycoY-1J5L-mJQ2Fy LV Write Access read/write LV Creation host, time ubuntudevbox2, 2013-03-29 12:18:26 +1100 LV Status available # open 1 LV Size 8.03 GiB Current LE 2055 Segments 3 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:0 --- Logical volume --- LV Path /dev/ubuntudevbox2/swap_1 LV Name swap_1 VG Name ubuntudevbox2 LV UUID LbvPFE-j3GO-oaF1-HQV3-a2r5-HTfy-YrhQve LV Write Access read/write LV Creation host, time ubuntudevbox2, 2013-03-29 12:18:29 +1100 LV Status available # open 2 LV Size 508.00 MiB Current LE 127 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:1
输出是绝对的在线
sudo lvextend -l 100%FREE /dev/ubuntudevbox2/root
既然你在vgextended之后只有8G的空闲盘符，你只能得到一个代表8G的绝对大小的lv。
您必须通知LVM您打算增加一个空间大小。 从lvextend
-l, --extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}] Extend or set the logical volume size in units of logical extents. With the '+' sign the value is added to the actual size of the logical volume and without it, the value is taken as an absolute one.
尝试
sudo lvextend -l +100%FREE /dev/ubuntudevbox2/root
从vgdisplay输出中可以看到，只有大约一半的空间被分配：
Alloc PE / Size 2182 / 8.52 GiB Free PE / Size 1851 / 7.23 GiB
我怀疑你需要更明确地为lvextend指定参数。