当前磁盘情况:[root@localhost ~]# df -h文件系统 容量 已用 可用 已用%% 挂载点/dev/mapper/VolGroup-lv_root18G 3.9G
当前磁盘情况:[root@localhost ~]# df -h文件系统 容量 已用 可用 已用%% 挂载点/dev/mapper/VolGroup-lv_root18G 3.9G 13G 24% /tmpfs 491M 0 491M 0% /dev/shm/dev/sda1 485M 33M 427M 8% /boot[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: 0x000b7ec6Device 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 LVMDisk /dev/sdb: 21.5 GB, 21474836480 bytes (新加盘21.5GB)255 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: 18.9 GB, 18865979392 bytes255 heads, 63 sectors/track, 2293 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: 2080 MB, 2080374784 bytes255 heads, 63 sectors/track, 252 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000000002：初始化准备新增的磁盘：root@CentOS ~]# pvcreate /dev/sdbPhysical volume “/dev/sdb” successfully created3：把新增的磁盘添加到LVM：[root@localhost ~]# vgextend VolGroup /dev/sdbVolume group “VolGroup” successfully extended4：查看增加磁盘后的LVM：[root@localhost ~]# vgdisplay -v VolGroupUsing volume group(s) on command lineFinding volume group “VolGroup”— Volume group —VG Name VolGroupSystem IDFormat lvm2Metadata Areas 2Metadata Sequence No 4VG Access read/writeVG Status resizableMAX LV 0Cur LV 2Open LV 2Max PV 0Cur PV 2Act PV 2VG Size 39.50 GiBPE Size 4.00 MiBTotal PE 10113Alloc PE / Size 4994 / 19.51 GiBFree PE / Size 5119 / 20.00 GiB //这里显示还有多少空间可用，就是新增的磁盘空间VG UUID le3nNT-u42B-nyOP-AOxf-qw8k-POqo-KmUAPf— Logical volume —LV Path /dev/VolGroup/lv_rootLV Name lv_rootVG Name VolGroupLV UUID akBltd-Jc6E-mZVr-3zzY-fS7g-Wh0u-UZCUAHLV Write Access read/writeLV Creation host, time localhost.localdomain, 2015-10-14 05:31:49 +0800LV Status available# open 1LV Size 17.57 GiBCurrent LE 4498Segments 1Allocation inheritRead ahead sectors auto– currently set to 256Block device 253:0— Logical volume —LV Path /dev/VolGroup/lv_swapLV Name lv_swapVG Name VolGroupLV UUID Cw2bUf-dpLI-BYrC-PqCl-nyJ3-MRnn-nSOSr6LV Write Access read/writeLV Creation host, time localhost.localdomain, 2015-10-14 05:31:51 +0800LV Status available# open 1LV Size 1.94 GiBCurrent LE 496Segments 1Allocation inheritRead ahead sectors auto– currently set to 256Block device 253:1— Physical volumes —PV Name /dev/sda2PV UUID 3gsnc1-Jw1n-iCGx-rKSP-85Aa-B7Sr-Nq8D62PV Status allocatableTotal PE / Free PE 4994 / 0PV Name /dev/sdbPV UUID vLI7Y0-Z9Ep-XLle-teGY-reRe-zCXq-jCSe8FPV Status allocatableTotal PE / Free PE 5119 / 51195：扩大逻辑卷（像windows扩大逻辑卷一样）：[root@localhost ~]# lvextend -L +19.5G /dev/mapper/VolGroup-lv_rootExtending logical volume lv_root to 37.07 GiBLogical volume lv_root successfully resized6：查看扩容后的LVM[root@localhost ~]# vgdisplay -v VolGroupUsing volume group(s) on command lineFinding volume group “VolGroup”— Volume group —VG Name VolGroupSystem IDFormat lvm2Metadata Areas 2Metadata Sequence No 5VG Access read/writeVG Status resizableMAX LV 0Cur LV 2Open LV 2Max PV 0Cur PV 2Act PV 2VG Size 39.50 GiBPE Size 4.00 MiBTotal PE 10113Alloc PE / Size 9986 / 39.01 GiBFree PE / Size 127 / 508.00 MiBVG UUID le3nNT-u42B-nyOP-AOxf-qw8k-POqo-KmUAPf— Logical volume —LV Path /dev/VolGroup/lv_rootLV Name lv_rootVG Name VolGroupLV UUID akBltd-Jc6E-mZVr-3zzY-fS7g-Wh0u-UZCUAHLV Write Access read/writeLV Creation host, time localhost.localdomain, 2015-10-14 05:31:49 +0800LV Status available# open 1LV Size 37.07 GiBCurrent LE 9490Segments 2Allocation inheritRead ahead sectors auto– currently set to 256Block device 253:0— Logical volume —LV Path /dev/VolGroup/lv_swapLV Name lv_swapVG Name VolGroupLV UUID Cw2bUf-dpLI-BYrC-PqCl-nyJ3-MRnn-nSOSr6LV Write Access read/writeLV Creation host, time localhost.localdomain, 2015-10-14 05:31:51 +0800LV Status available# open 1LV Size 1.94 GiBCurrent LE 496Segments 1Allocation inheritRead ahead sectors auto– currently set to 256Block device 253:1— Physical volumes —PV Name /dev/sda2PV UUID 3gsnc1-Jw1n-iCGx-rKSP-85Aa-B7Sr-Nq8D62PV Status allocatableTotal PE / Free PE 4994 / 0PV Name /dev/sdbPV UUID vLI7Y0-Z9Ep-XLle-teGY-reRe-zCXq-jCSe8FPV Status allocatableTotal PE / Free PE 5119 / 1276：文件系统扩容（注意，这点必须做，因为上面只是空间扩容）[root@localhost ~]# resize2fs /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 = 2, new_desc_blocks = 3Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 9717760 (4k) blocks.The filesystem on /dev/mapper/VolGroup-lv_root is now 9717760 blocks long.7：查看最后磁盘情况文件系统 容量 已用 可用 已用%% 挂载点/dev/mapper/VolGroup-lv_root37G 3.9G 31G 12% /tmpfs 491M 0 491M 0% /dev/shm/dev/sda1 485M 33M 427M 8% /boot
