lvm相关命令学习

我的博客已迁移到xdoujiang.com请去那边和我交流基础环境1、当前版本cat /etc/debian_version7.82、安装包lvm2apt-get install lvm2 -y一、将sdb sdc sdd三块分区加到卷组(hadoop),并创建5G的逻辑卷(hadoop1),PE默认1、使用pvcreate命令将sdb sdc sdd分区创建成物理卷(pvcreate - initialize a disk or partition for use by LVM)pvcreate /dev/sdb /dev/sdc /dev/sdd  Writing physical volume data to disk "/dev/sdb"  Physical volume "/dev/sdb" successfully created  Writing physical volume data to disk "/dev/sdc"  Physical volume "/dev/sdc" successfully created  Writing physical volume data to disk "/dev/sdd"  Physical volume "/dev/sdd" successfully createdEXAMPLESInitialize partition #4 on the third SCSI disk and the entire fifth SCSI disk for later use by LVM:pvcreate /dev/sdc4 /dev/sde2、使用pvs或pvdisplay命令查看1)pvs(pvs - report information about physical volumes)  PV         VG   Fmt  Attr PSize  PFree   /dev/sdb        lvm2 a--  10.00g 10.00g  /dev/sdc        lvm2 a--  10.00g 10.00g  /dev/sdd        lvm2 a--  10.00g 10.00g2)pvdisplay(pvdisplay - display attributes of a physical volume)  "/dev/sdb" is a new physical volume of "10.00 GiB"  --- NEW Physical volume ---  PV Name               /dev/sdb  VG Name                 PV Size               10.00 GiB  Allocatable           NO  PE Size               0     Total PE              0  Free PE               0  Allocated PE          0  PV UUID               OkVC5O-SWOq-daXZ-BrNy-Hy83-G9Sm-d8bMT4     "/dev/sdc" is a new physical volume of "10.00 GiB"  --- NEW Physical volume ---  PV Name               /dev/sdc  VG Name                 PV Size               10.00 GiB  Allocatable           NO  PE Size               0     Total PE              0  Free PE               0  Allocated PE          0  PV UUID               7vg9eM-pIRR-Ahi0-BNvn-A1pr-WQa0-hvdC9X     "/dev/sdd" is a new physical volume of "10.00 GiB"  --- NEW Physical volume ---  PV Name               /dev/sdd  VG Name                 PV Size               10.00 GiB  Allocatable           NO  PE Size               0     Total PE              0  Free PE               0  Allocated PE          0  PV UUID               MyPYTC-Vk4P-ltjL-SX6w-jK3V-422c-HACxOK3、使用vgcreate命令创建hadoop卷组并将sdb sdc sdd加入到卷组里(vgcreate - create a volume group)vgcreate hadoop /dev/sdb /dev/sdc /dev/sdd  Volume group "hadoop" successfully created这里使用默认的PE 4MB  EXAMPLESTo create a volume group named test_vg using physical volumes /dev/sdk1, and /dev/sdl1 with default physical extent size of 4MB:vgcreate test_vg /dev/sdk1 /dev/sdl1  4、使用vgs或vgdisplay命令查看1)vgs(vgs - report information about volume groups)  VG     #PV #LV #SN Attr   VSize  VFree   hadoop   3   0   0 wz--n- 29.99g 29.99g2)vgdisplay(vgdisplay - display attributes of volume groups)   --- Volume group ---  VG Name               hadoop  System ID               Format                lvm2  Metadata Areas        3  Metadata Sequence No  1  VG Access             read/write  VG Status             resizable  MAX LV                0  Cur LV                0  Open LV               0  Max PV                0  Cur PV                3  Act PV                3  VG Size               29.99 GiB  PE Size               4.00 MiB  Total PE              7677  Alloc PE / Size       0 / 0     Free  PE / Size       7677 / 29.99 GiB  VG UUID               9BpObQ-0qNt-7MRM-cJ4Y-aMyE-5ZEd-GoSi9N5、使用lvcreate命令创建逻辑卷为hadoop1 大小是5G(lvcreate creates a new logical volume in a volume group)lvcreate -L 5G -n hadoop1 hadoop  Logical volume "hadoop1" created-L, --size LogicalVolumeSize[bBsSkKmMgGtTpPeE]Gives the size to allocate for the new logical volume.A size suffix of K for kilobytes,M for megabytes,G for gigabytes,T for terabytes,P for petabytes or E for exabytes is optional.Default unit is megabytes.6、使用lvs或lvdisplay命令查看1)lvs(lvs - report information about logical volumes)    LV      VG     Attr     LSize Pool Origin Data%  Move Log Copy%  Convert  hadoop1 hadoop -wi-a--- 5.00g                                           2)lvdisplay(lvdisplay - display attributes of a logical volume)   --- Logical volume ---  LV Path                /dev/hadoop/hadoop1  LV Name                hadoop1  VG Name                hadoop  LV UUID                y8CHyc-G7du-h9jZ-XV4T-dvZC-bzv1-NdsbS0  LV Write Access        read/write  LV Creation host, time debian, 2015-06-12 23:51:09 -0400  LV Status              available  # open                 0  LV Size                5.00 GiB  Current LE             1280  Segments               1  Allocation             inherit  Read ahead sectors     auto  - currently set to     256  Block device           254:07、将/dev/hadoop/hadoop1格式化成ext4mkfs.ext4 /dev/hadoop/hadoop18、写进/etc/fatab中并挂载/dev/mapper/hadoop-hadoop1               /hadoop          ext4 defaults 0 0mount -a9、查看是否挂载成功df -ThFilesystem                                             Type      Size  Used Avail Use% Mounted onrootfs                                                 rootfs    9.2G  1.7G  7.1G  19% /udev                                                   devtmpfs   10M     0   10M   0% /devtmpfs                                                  tmpfs      99M  256K   99M   1% /run/dev/disk/by-uuid/f730250f-21de-45dd-a3e7-6c5d74508f4b ext4      9.2G  1.7G  7.1G  19% /tmpfs                                                  tmpfs     5.0M     0  5.0M   0% /run/locktmpfs                                                  tmpfs     961M     0  961M   0% /run/shm/dev/sda5                                              ext4       17G  180M   16G   2% /opt/dev/mapper/hadoop-hadoop1                             ext4      5.0G  138M  4.6G   3% /hadoop二、将/dev/mapper/hadoop-hadoop1逻辑卷夸大到40G并挂载1、使用pvcreate命令将sde分区创建成物理卷pvcreate /dev/sde  Writing physical volume data to disk "/dev/sde"  Physical volume "/dev/sde" successfully created2、使用vgextend命令将sde加入到卷组hadoop(vgextend - add physical volumes to a volume group)vgextend hadoop /dev/sde  Volume group "hadoop" successfully extendedExamplesvgextend vg00 /dev/sda4 /dev/sdn1 tries to extend the existing volume group vg00by the new physical volumes (see pvcreate(8)) /dev/sdn1 and /dev/sda4.3、先查看下卷组有多少PEvgdisplay   --- Volume group ---  VG Name               hadoop  System ID               Format                lvm2  Metadata Areas        4  Metadata Sequence No  8  VG Access             read/write  VG Status             resizable  MAX LV                0  Cur LV                1  Open LV               1  Max PV                0  Cur PV                4  Act PV                4  VG Size               39.98 GiB  PE Size               4.00 MiB  Total PE              10236  Alloc PE / Size       8956 / 34.98 GiB  Free  PE / Size       1280 / 5.00 GiB  VG UUID               9BpObQ-0qNt-7MRM-cJ4Y-aMyE-5ZEd-GoSi9N一共有10236个PE  4、使用lvextend命令将现有逻辑卷为hadoop1增大到40G(lvextend - extend the size of a logical volume)lvextend -l 10236 /dev/hadoop/hadoop1  Extending logical volume hadoop1 to 39.98 GiB  Logical volume hadoop1 successfully resized-l, --extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}]Extend or set the logical volume size in units of logical extents.5、使用resize2fs命令扩大文件系统(resize2fs - ext2/ext3/ext4 file system resizer)resize2fs /dev/hadoop/hadoop1 resize2fs 1.42.5 (29-Jul-2012)Filesystem at /dev/hadoop/hadoop1 is mounted on /hadoop; on-line resizing requiredold_desc_blocks = 1, new_desc_blocks = 3Performing an on-line resize of /dev/hadoop/hadoop1 to 10481664 (4k) blocks.The filesystem on /dev/hadoop/hadoop1 is now 10481664 blocks long.6、最后检查下是否扩大到40G了df -ThFilesystem                                             Type      Size  Used Avail Use% Mounted onrootfs                                                 rootfs    9.2G  1.7G  7.1G  19% /udev                                                   devtmpfs   10M     0   10M   0% /devtmpfs                                                  tmpfs      99M  260K   99M   1% /run/dev/disk/by-uuid/f730250f-21de-45dd-a3e7-6c5d74508f4b ext4      9.2G  1.7G  7.1G  19% /tmpfs                                                  tmpfs     5.0M     0  5.0M   0% /run/locktmpfs                                                  tmpfs     961M     0  961M   0% /run/shm/dev/sda5                                              ext4       17G  180M   16G   2% /opt/dev/mapper/hadoop-hadoop1                             ext4       40G  143M   38G   1% /hadoop三、参考文章https://wiki.archlinux.org/index.php/LVM_%28%E7%AE%80%E4%BD%93%E4%B8%AD%E6%96%87%29