VM下通过LVM增加LINUX硬盘空间.docx

VM下通过LVM增加LINUX硬盘空间安装CENTOS时低估了它能占用的磁盘空间，结果造成一个现像，当磁盘/目录只剩2M时网站打不开，MYSQL重启不成功。 一个实例过程：第一步 增加分区：1、VMsettingharddisk 下扩大磁盘（菜单操作不再赘复）。2、现在系统中还看不到加入的容量。使用fdisk 命令fdisk /dev/sda用n命令建个P类型的磁盘，然后用t命令更改ID为8e（LVM类别）。# p查看一下：Disk /dev/sda: 17.1 GB,bytes255 heads, 63 sectors/track, 2088 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System/dev/sda1 * 1 13 104391 83 Linux/dev/sda2 14 1044 8281507+ 8e Linux LVM/dev/sda3 1045 1545 4024282+ 8e Linux LVM/dev/sda4 1546 2088 4361647+ 83 Linux最后W保存ps:这里要重启一下服务器，不然挂载不上新建的sda3、sda4。第二步 加入VLM:这里有两种方法扩容/目录，一种是把/var、/usr等迁移到sda3,然后做ln -s，但这种方法如果sda3挂掉的话，那，那就哭吧。本文使用另一种方法：root#lvmlvm pvcreate /dev/sda3 #创建一个LVM硬分区 Cant open /dev/sda3 exclusively. Mounted filesystem?root#mkfs.ext3 /dev/sda3 #没有成功是因为没有格式化，要与/目录格式一样。lvmpvcreate /dev/sda3 Physical volume /dev/sda3 successfully createdlvm vgextend VolGroup00 /dev/sda3 #加入与/目录同一个LVM组 Volume group VolGroup00 successfully extended查看一下：lvmpvdisplay - Physical volume - PV Name /dev/sda2 VG Name VolGroup00 PV Size 7.90 GB / not usable 23.41 MB Allocatable yes (but full) PE Size (KByte) 32768 Total PE 252 Free PE 0 Allocated PE 252 PV UUID ua5FJN-jSLL-bGkp-w0XO-N8JG-MBR0-1yDzGW - Physical volume - PV Name /dev/sda3 VG Name VolGroup00 PV Size 3.84 GB / not usable 25.96 MB Allocatable yes PE Size (KByte) 32768 Total PE 122 Free PE 122 Allocated PE 0 PV UUID mHKWzk-mQ1o-jkQB-0DZC-PVqW-w2R9-14y19G把sda3变为LVM的虚拟磁盘（增加容量的关键）vgextend /dev/VolGroup00/LogVol102 /dev/sda3第三步 增加 /目录容量lvm lvextend -L +3.8G /dev/VolGroup00/LogVol00 Rounding up size to full physical extent 3.81 GB Extending logical volume LogVol00 to 9.69 GB Logical volume LogVol00 successfully resized#还要重新一下识别磁盘容量# resize2fs /dev/VolGroup00/LogVol00resize2fs 1.39 (29-May-2006)Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing requiredPerforming an on-line resize of /dev/VolGroup00/LogVol00 to 2539520 (4k) blocks.The filesystem on /dev/VolGroup00/LogVol00 is now 2539520 blocks long.查看最终结果：lvm lvdisplay - Logical volume - LV Name /dev/VolGroup00/LogVol00 VG Name VolGroup00 LV UUID r9eG4x-njBD-z2HT-lmL2-2l81-P3XV-KVd0e4 LV Write Access read/write LV Status available # open 1 LV Size 9.69 GB Current LE 310 Segments 2 Allocation inherit