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lvm相关命令学习
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基础环境
1、当前版本
cat /etc/debian_version
7.8
2、安装包lvm2
apt-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 created
EXAMPLES
Initialize partition #4 on the third SCSI disk and the entire fifth SCSI disk for later use by LVM:
pvcreate /dev/sdc4 /dev/sde
2、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 10.00g
2)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-HACxOK
3、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
EXAMPLES
To 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 29.99g
2)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-GoSi9N
5、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 254:0
7、将/dev/hadoop/hadoop1格式化成ext4
mkfs.ext4 /dev/hadoop/hadoop1
8、写进/etc/fatab中并挂载
/dev/mapper/hadoop-hadoop1 /hadoop ext4 defaults 0 0
mount -a
9、查看是否挂载成功
df -Th
Filesystem Type Size Used Avail Use% Mounted on
rootfs rootfs 9.2G 1.7G 7.1G 19% /
udev devtmpfs 10M 0 10M 0% /dev
tmpfs 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/lock
tmpfs 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 created
2、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 extended
Examples
vgextend vg00 /dev/sda4 /dev/sdn1 tries to extend the existing volume group vg00
by the new physical volumes (see pvcreate(8)) /dev/sdn1 and /dev/sda4.
3、先查看下卷组有多少PE
vgdisplay
--- 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 required
old_desc_blocks = 1, new_desc_blocks = 3
Performing 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 -Th
Filesystem Type Size Used Avail Use% Mounted on
rootfs rootfs 9.2G 1.7G 7.1G 19% /
udev devtmpfs 10M 0 10M 0% /dev
tmpfs 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/lock
tmpfs 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
网站题目：lvm相关命令学习
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