[root@localhost ~]# fdisk -lDisk /dev/sda: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00083529 Device Boot Start End Blocks Id System/dev/sda1 * 1 64 512000 83 LinuxPartition 1 does not end on cylinder boundary./dev/sda2 64 2611 20458496 8e Linux LVM#/dev/sdb盘还有足够的空间Disk /dev/sdb: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000Disk /dev/mapper/VolGroup-lv_root: 18.8 GB, 18798870528 bytes255 heads, 63 sectors/track, 2285 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000Disk /dev/mapper/VolGroup-lv_swap: 2147 MB, 2147483648 bytes255 heads, 63 sectors/track, 261 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000[root@localhost ~]# fdisk /dev/sdbDevice contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelBuilding a new DOS disklabel with disk identifier 0xac7c929b.Changes will remain in memory only, until you decide to write them.After that, of course, the previous content won't be recoverable.Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u').Command (m for help): pDisk /dev/sdb: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xac7c929b Device Boot Start End Blocks Id SystemCommand (m for help): nCommand action e extended p primary partition (1-4)pPartition number (1-4): 1#分区号First cylinder (1-2610, default 1): #回车用默认的Using default value 1Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): #回车用默认的Using default value 2610Command (m for help): t #改变类型Selected partition 1Hex code (type L to list codes): 8e #LVM的分区代码Changed system type of partition 1 to 8e (Linux LVM)Command (m for help): pDisk /dev/sdb: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xac7c929b Device Boot Start End Blocks Id System/dev/sdb1 1 2610 20964793+ 8e Linux LVMCommand (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.[root@localhost ~]# partprobe#将磁盘分区表变化信息通知内核，请求操作系统重新加载分区表，有些小报错不要紧。Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.Warning: WARNING: the kernel failed to re-read the partition table on /dev/sdb (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.Error: Invalid partition table - recursive partition on /dev/sr0.
[root@localhost ~]# pvdisplay --- Physical volume --- PV Name /dev/sda2 VG Name VolGroup PV Size 19.51 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 4994 Free PE 0 Allocated PE 4994 PV UUID qkBdcn-RQaR-ZliO-Ja2S-RhMC-stw8-CO213I "/dev/sdb1" is a new physical volume of "19.99 GiB" --- NEW Physical volume --- PV Name /dev/sdb1 VG Name PV Size 19.99 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID H7tDqG-6AZv-yBSA-U0ov-Ni0y-dlPA-kAA83i [root@localhost ~]# vgextend VolGroup /dev/sdb1 Volume group "VolGroup" successfully extendedYou have new mail in /var/spool/mail/root[root@localhost ~]# vgdisplay --- Volume group --- VG Name VolGroup System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 4 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 39.50 GiB PE Size 4.00 MiB Total PE 10112 Alloc PE / Size 4994 / 19.51 GiB Free PE / Size 5118 / 19.99 GiB VG UUID dc0vI9-KzGu-4S59-A1xv-NM4Y-rYBF-3jDNRn
5.扩展逻辑卷
[root@localhost ~]# lvextend -l +100%free /dev/mapper/VolGroup-lv_root#free也可以大写FREE Extending logical volume lv_root to 37.50 GiB Logical volume lv_root successfully resized[root@localhost ~]# blkid /dev/mapper/VolGroup-lv_root#查看分区文件系统类型/dev/mapper/VolGroup-lv_root: UUID="972fdddd-ddb8-469f-a342-e075eaeabeb2" TYPE="ext4"[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_root#e2fsck -f检查分区e2fsck 1.41.12 (17-May-2010)/dev/mapper/VolGroup-lv_root is mounted.e2fsck: Cannot continue, aborting.[root@localhost ~]# resize2fs /dev/mapper/VolGroup-lv_root#如果分区是xfs系统，则用xfs_growfs命令对文件系统进行扩展resize2fs 1.41.12 (17-May-2010)Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing requiredold desc_blocks = 2, new_desc_blocks = 3Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 9830400 (4k) blocks.The filesystem on /dev/mapper/VolGroup-lv_root is now 9830400 blocks long.[root@localhost ~]# df -h#查看磁盘空间，根分区已扩展到37G。Filesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root 37G 7.0G 29G 20% /tmpfs 2.0G 224K 2.0G 1% /dev/shm/dev/sda1 485M 40M 421M 9% /boot/dev/sr0 3.6G 3.6G 0 100% /media/cdrom
